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1
Ilie, Katherine-Rodica, and Katherine ilie@rmit edu au. "Modelling, Simulation and Optimisation of Asymmetric Rotor Profiles in Twin-screw Superchargers." RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080213.144857.
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There is a growing recognition worldwide of the need for more powerful, smaller petrol engines, capable of delivering the higher picking power of larger engines, yet still being economical and environmentally friendly when used for day-to-day driving. An engineering solution for more efficient engines has been considered by research so far. It has been identified that superchargers can potentially improve the performance of automotive engines; therefore research has focused on developing superchargers and supercharger components with higher efficiency. Of particular interest to the research presented in this thesis has been the twin-screw supercharging compressor with design adapted for automotive use (the twin-screw supercharger). The performance of this supercharger type depends on the volume and total losses of the air flow through the supercharger rotors more than on any other aspects of its behaviour. To accurately predict the efficiency of the twin-screw su percharger for matching a particular engine system, accurate supercharger design is required. The main objective of this research was the investigation of the existing limitations of twin-screw superchargers, in particular leakage and reduced efficiency, leading to the development of optimal asymmetric rotor profiles. This research has been completed in four stages defining an innovative rotor design method. The parametric three-dimensional geometric model of twin-screw supercharger rotors of any aspect ratio was developed. For model validation through visualisation, CAD rotor models with scalable data were generated in commercial CAD software and calibrated experimentally by Laser Doppler Velocimetry (LDV) tests. Calibrated rotor profile data can be transferred into CAD-CFD interface for flow simulation and performance optimisation. Through the application of this new rotor design method, new opportunities are created for the twin-screw supercharger design practice, making it a part of the engineering solution for more efficient engines.
2
Colonna, Jacopo. "Sviluppo di un sistema di sovralimentazione assistito elettricamente per un motore diesel 3.0L V6 ad alta potenza specifica." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8758/.
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Questa tesi di laurea nasce dall’esperienza maturata presso l’azienda FCA Italy (Fiat Chrysler Automobiles S.p.A., ex VM Motori) nello stabilimento situato a Cento in provincia di Ferrara, in particolare all’interno dell’ufficio di Ricerca Avanzata CRM (Centro Ricerca Motori), divisione del reparto R&D (Research and Development).
Tale esperienza viene riassunta (in piccola parte) in questo elaborato di Tesi, che tratta tematiche inerenti allo sviluppo di un sistema di sovralimentazione assistito elettricamente, applicato ad un propulsore Diesel 3.0L V6 destinato ai segmenti “Premium” del mercato.
Il sistema utilizzato, che ha come componente principale un compressore attuato da una macchina elettrica, appartiene all’insieme delle tecnologie cosiddette di e-boosting.
Questo tipo di tecnologia, fortemente innovativa e ad oggi non ancora presente sul mercato, ha le potenzialità per rappresentare un significativo passo avanti nel processo di riduzione delle emissioni, dei consumi e del miglioramento delle performance dei moderni motori endotermici alternativi, al punto che un numero crescente di costruttori di motori sta oggi studiando soluzioni come quella oggetto di questo elaborato.
L’obiettivo è stato quindi quello di definire, applicare e gestire il sistema di e-boost a banco motore e, successivamente, caratterizzarlo dal punto di vista energetico e testarne le effettive potenzialità.
Le fasi in cui ho apportato il mio contributo sono state, in particolare, quelle di definizione e integrazione dei nuovi componenti all’interno del layout motore preesistente, di realizzazione e implementazione delle strategie di controllo in un sistema dedicato in grado di gestire efficacemente i componenti, e di sperimentazione al banco prova.
I risultati conseguiti al termine dell’attività sono quindi inerenti allo sviluppo e validazione del sistema di controllo, alla valutazione delle performance del propulsore risultante e alla caratterizzazione e analisi critica del sistema di e-boost dal punto di vista energetico.
3
Cicognani, Alessandro. "Studio ed ottimizzazione di un sistema di sovralimentazione per un motore a 2 tempi aeronautico." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8774/.
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Janíček, Michal. "Přeplňovaný zážehový motor mechanickým dmychadlem." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400431.
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The diploma thesis deals with the selection of an eligible supercharger for cooperation with the internal combustion SI engine Honda K20A2. The first part is dedicated to the research referring to an issue of charging and a brief description of particular supercharger types. However, the main part of the thesis consists in the formation of proposal calculation and the tentative choice of the eligible type of supercharger. The part of the work is also the description of the assigned engine and the measurement of its parameters. The most extensive part of the thesis deals with the making of computational model of the atmospheric and supercharged version of the engine and the consecutive simulations in the GT-Power software. Finally, gained results are evaluated and the computational study of the cooperation of the selected supercharger with assigned combustion engine is made in the last part of the diploma thesis.
5
Бондаренко, Є. І. "Багатоцільовий газовий відцентровий нагнітач". Master's thesis, Сумський державний університет, 2019. http://essuir.sumdu.edu.ua/handle/123456789/76514.
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Вступ
Об'єкт та мета дослідження
Перелік та порівняльні характеристики сталей, які застосовуються в середовищі які містять нітрозні гази та вибір матеріалу
7. Обґрунтування конструкції колеса
8. Класифікація корозійних процесів
9. Результати розрахунків
10. Розділ охорони праці
11.Висновки
Список літератури
Додаток А<br>Введение
Объект и цель исследования
Перечень и сравнительные характеристики сталей, применяемых в среде содержащие нитрозные газы и выбор материала
7. Обоснование конструкции колеса
8. Классификация коррозионных процессов
9. Результаты расчетов
10. Раздел охраны труда
11.Висновкы
список литературы
приложение А<br>Introduction
Object and purpose of research
The list and comparative characteristics of the steels used in media containing nitrous gases and material selection
7. Justification of the design of the wheel
8. Classification of corrosion processes
9. Results of calculations
10. Section of labor protection
11. Wisnowski
list of references
Appendix A
6
Гусєв, В. А. "Чисельне дослідження течії ВРА відцентрового нагнітача". Master's thesis, Сумський державний університет, 2018. http://essuir.sumdu.edu.ua/handle/123456789/72126.
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У роботі виконано чисельне дослідження течії ВРА відцентрового нагнітача. Для цих цілей частіше використовують ВРА осьового і радіального типу. Регулювання за допомогою осьового ВРА вивчено достатньо добре, тому в цій роботі були поставленні завдання:
Мета роботи: углибленне вивчення питання регулювання ступені за допомогою вхідного регулюючого апарату радіального типу (ВРА-Р) , а та-кож дослідження характеристик самого ВРА і ВРА разом з робочим колесом (РК).
Об'єкт дослідження: ступінь відцентрового нагнітача з ВРА-Р.
Предмет дослідження: структура потоку та характеристика ВРА і ВРА разом з РК.
Метод дослідження: теоретичний, з використанням САПР та CFD програм ( Flowvision, ANSYS, Solidworks, Inventor).<br>В работе выполнено численное исследование течения ВРА центробежного нагнетателя. Для этих целей чаще используют ВРА осевого и радиального типа. Регулировка с помощью осевого ВРА изучено достаточно хорошо, поэтому в этой работе были поставлены задачи:
Цель работы: углибленне изучения вопроса регулирования степени с помощью входящего регулирующего аппарата радиального типа (ВРА-Р), а-же исследования характеристик самого ВРА и ВРА вместе с рабочим колесом (РК).
Объект исследования: степень центробежного нагнетателя с ВРА-Р.
Предмет исследования: структура потока и характеристика ВРА и ВРА вместе с РК.
Метод исследования: теоретический, с использованием САПР и CFD программ (Flowvision, ANSYS, Solidworks, Inventor).<br>A numerical study of the BPA flow of a centrifugal supercharger was performed. For these purposes, axial and radial BPA are most often used. Adjustment with the help of axial BPA has been studied quite well, therefore, in this work the following tasks were set:
Objective: to study the issue of regulating the degree with the help of the incoming regulating device of the radial type (BPA-R), while studying the characteristics of the BPA and BPA itself together with the impeller (RK).
The object of study: the degree of centrifugal supercharger with BPA-R.
Subject of research: the structure of the flow and the characteristics of BPA and BPA together with the Republic of Kazakhstan.
Research method: theoretical, using CAD and CFD programs (Flowvision, ANSYS, Solidworks, Inventor).
7
Celý, Martin. "Zvýšení účinnosti spalovacího motoru pro malé autonomní prostředky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444982.
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The work deals with the analysis of various possibilities of increasing the efficiency of a small internal combustion engine potentially usable for use in the field of autonomous devices of smaller dimensions. It contains an outline of the problems of modern smaller autonomous means and an analysis of available drives designed for them, especially an analysis of propulsion by internal combustion engines. In his next part of the work he provides information about the created mathematical model of the demonstration internal combustion engine in the GT-Power program and an analysis of places where and in what ways its efficiency can be increased. The design of two such components together with the evaluation of the achieved results offers the conclusion of this work.
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伸宜, 奥井, та Nobunori Okui. "新方式ハイブリッドシステム搭載長距離貨物トラックの燃料消費率改善に関する研究". Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13097335/?lang=0, 2018. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13097335/?lang=0.
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車両の電動化(ハイブリッド化)と内燃機関システムの電動化を最適に組み合わせた技術と、それらを効果的に稼働させるハイブリッド制御ロジックを適用した新方式大型ハイブリッドトラックを提案した。長距離貨物輸送時の燃料消費率の改善に対し効果があることを明らかとした。同時に、従来大型トラックに対し、荷室搭載性の確保や車両コストの抑制が可能となることが分かり、実用性の面でも優位性があることを示した。<br>博士(工学)<br>Doctor of Philosophy in Engineering<br>同志社大学<br>Doshisha University
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Гіренко, С. Г. "Автоматичне антипомпажне регулювання відцентрового нагнітача дотискувальної компресорної станції". Thesis, Івано-Франківський національний технічний університет нафти і газу, 2010. http://elar.nung.edu.ua/handle/123456789/1966.
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Дисертацію присвячено розробці методу для автоматичного антипомпажного регулювання і захисту відцентрового нагнітача дотискувальної компресорної станції підземного сховища газу, що дозволяє скоротити час на виявлення коливань у проточній частині компресора шляхом визначення координат робочої точки відцентрового нагнітача в системі координат «політропний напір - об’ємна витрата», або «ступінь стиснення газу -масова витрата» та врахування якісного досвіду експертів і експериментальних даних.
Запропоновано метод автоматичного захисту відцентрового нагнітача від помпажу в робочому режимі компресора, який грунтується на інформації про комплекс параметрів, за допомогою яких визначається поточне значення віддаленості координат робочої точки нагнітача від заданої величини, а також мінімальне значення віддаленості, яке далі використовується як поточне і по відношенню до нього розраховується сигнал розузгодження при керуванні органами керування і при здійснені антипомпажного регулювання. Цим забезпечується надійний захист відцентрового нагнітача від раптового виникнення помпажу при швидкодіючих збуреннях, або флуктуаціях газового потоку за умови незмінності заданої межі помпажу.<br>The thesis is devoted to development of methods of automatic antypompage control and protection of centrifugal supercharger of the compressor station of dug-out of gas, that allows to shorten time on the exposure of vibrations in running part of compressor by determination of coordinates of q-point of centrifugal supercharger in the system of co-ordinates a «polytropic pressure -volume expense», or a «degree of compression of gas - mass expense» and account of high-quality experience of experts and experimental information.
The method of automatic pompage protection of compressor centrifugal supercharger in the operating condition is offered. This method is based on information about the complex of parameters, which help to determinate the current value of remoteness of co-ordinates of q-point of supercharger from the set value, and also minimum value of remoteness, which is farther used as current and for the determination of the signal of error settles accounts for the control of management devices and realization of antypompage adjustings. This provides the reliable protecting for centrifugal supercharger from the sudden origin of pompage at fast-acting indignations, or fluctuations of gas stream, on condition of invariability of the set limit of pompage.
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Cronican, James. "Macromolecule Delivery into Mammalian Cells Using Supercharged Proteins." Thesis, Harvard University, 2012. http://dissertations.umi.com/gsas.harvard:10142.
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Delivery of macromolecules into mammalian cells in vitro and in vivo has enabled new areas of research and offers the potential for powerful new treatment options. Recent research has generated many delivery platforms but these solutions remain limited by scope, potency and safety. We have reported a superpositively charged green fluorescent protein (+36 GFP) with the ability to deliver nucleic acids into a variety of mammalian cell lines in vitro and to potently deliver protein in vitro and in vivo without toxicity. These results have directed us to identify a subset of naturally occurring human proteins with similar but previously unknown cell-penetrating and protein delivery properties. Preliminary efforts have been made towards establishing the therapeutic potential for supercharged proteins replacement of the cytosolic enzyme, argininosuccinate synthase. Preliminary efforts have also been made towards enhancing endosomal escape with \(His_{39} GFP\).
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Anderson, Stephen James. "The scavenging and performance characteristics of a multi-cylinder, supercharged, uniflow-scavenged two-stroke engine." Thesis, Queen's University Belfast, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337049.
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Conlon, Paul. "Thermodynamic analysis of supercharged, fuel-injected two-stroke cycle engines." Thesis, Queen's University Belfast, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317435.
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Bester, Wallace William. "Application of turbochargers in spark ignition passenger vehicles." Thesis, Link to the online version, 2006. http://hdl.handle.net/10019/165.
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Hammou, Bouziane Amine. "BPS States and D1-D5 System in Theories with Sixteen Supercharges." Doctoral thesis, SISSA, 2000. http://hdl.handle.net/20.500.11767/4327.
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Gurney, D. C. "The application of 1D simulation to model turbocharged and supercharged spark ignition engines." Thesis, University of Warwick, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271942.
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Conway, Graham. "Cyclic variability of flame propagation and autoignition in supercharged and naturally aspirated SI engines." Thesis, University of Leeds, 2013. http://etheses.whiterose.ac.uk/5320/.
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The ever-changing demands from consumers for more fuel efficient vehicles necessitates automotive manufacturers developing ever more radical proposals for engine design. The latest trend from manufacturers is engine ”downsizing”; where a smaller, more efficient, engine is pressure-charged to recoup the lost full-load performance. An effect of downsizing is that engines now run at significant intake pressures. Additionally, implementation of simulation techniques as an integral part of the research and design process is becoming commonplace in the automotive industry. Whether or not current models can be considered reliable for combustion prediction at significantly elevated pressures, such as those experienced by downsized engines, is a main focus of the current work, predominantly assessed through how the crank-resolved in-cylinder pressure traces from prediction, compare to experiment. Experimental data was provided by four different engines: two Jaguar Land Rover multi-cylinder engines, one naturally aspirated, the other heavily downsized, and two University of Leeds bespoke research engines operating under naturally aspirated, or high pressure conditions representative of downsized engines. It was seen that the combustion models were not able to accurately predict combustion at different pressures without adjustment of the turbulence quantities, namely the length scale used to define the ”after-burning” process. Additionally, it is known that variability of combustion limits the performance of engines significantly; a better understanding of variability which may lead to mitigation methods would result in significant efficiency gains. The magnitude of variability in the four different engines is investigated in this work as well as the current capability in predicting the variability. Once a mean cycle was successfully matched, the variability of the engine cycles is accurately predicted for all engines and conditions by a random-number model, invoking variability on two parameters, u0 and �, with Gaussian distribution. Moreover a novel method for assessing variability is proposed and is employed in a study to assess the influence of combustion variability at different stages of combustion. The variability of the combustion event was seen to be a strong function of the very early stages of combustion. The propensity for autoignition is also known to increase with operating pressure and temperature. The predictive capability, of two autoignition models, was assessed against experimental data. It was observed that a chemical kinetic based autoignition model was more able to predict autoignition over all engines, vis-´a-vis an empirically based model. In addition, it was also seen that a variability of autoignition within the engine existed, which was independent of burning rate. Finally, ”knocking” cycles were identified within the heavily supercharged, multi-cylinder research engine which defined the calibration limit of the engine. It was seen, however, that the frequency of pressure oscillations was beyond that traditionally seen for knock cycles.
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Emslie, Lovell Donald. "The effect of turbo-charging and intercoolingon emissionsgeneration [i.e. intercooling on emissions generation] and durability of a diesel engine." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52520.
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Thesis (MScEng)--University of Stellenbosch, 2001.<br>ENGLISH ABSTRACT: To reduce exhaust gas emissions in diesel engines and for engine upgrade purposes the
major parameters and equipment that should be looked at are boost pressure, intake
charge temperature, combustion chamber design and fuel injection equipment. Boost
pressure is governed by the turbo-charger; with high-efficiency variable geometry turbochargers,
effective control is possible to increase airflow rate at all operating conditions
of the engine. Efficient air-to-air inter-cooling results in the engine being filled with a
cooler air charge that will influence engine durability and heat rejection to the cooling
system. The main objective of the investigation is to look at the influence of boost
pressure and intake charge temperature on diesel combustion to better understand the
processes where boost pressure is increased and intake charge temperature reduced to
increase the brake mean effective pressure of the engine and reduce emissions generation.
By running an engine at different intake boost pressures and intake charge temperatures a
25-point matrix was formed at three different operating conditions. On completion of the
engine testing, data processing and data evaluation, a number of important conclusions
were made about the behaviour of the engine running under different conditions. This
enabled the researcher to understand how boost pressure and intake charge temperature
influence engine power output, fuel consumption, engine durability and exhaust gas
emissions. The opinion is proved when, in most cases, the 75 test points were used to
build multiple linear regression models to determine which engine parameters (dependent
variables) have a significant effect on emissions generation and durability parameters.
From the data it is evident that boost pressure has a positive influence on most engine
parameters, as an increase in boost pressure results in an increase in air mass flow
through the engine. An increase in air mass flow reduces combustion chamber gas
temperature as the result of an increase in excess air ratio during combustion.
A further result of the increase in excess air ratio is that less soot is formed during the
first part of combustion and more soot and partly decomposed Hydrocarbon (HC)
compounds are oxidised during the late combustion phase. Therefore, with an increase in
boost pressure, Bosch smoke emissions reduce, but with a change in intake air
temperature no difference in smoke concentration is seen except at the very low boost
pressure and very high boost temperature test points where low air/fuel ratios exist and
the slight increase in air-flow rate as a result of lower air inlet temperature has a big
influence.
Nitric Oxide (NO) emissions, on the other hand, are more dependent on intake air
temperature than on boost pressure, which was proved in the multiple regressions
modelling performed on the test data. The flame zone and the post-flame zone
temperature play the dominant role in NO formation. As explained in the results
discussion on NO formation, intake air temperature influences the ignition mixture
temperature and the subsequent flame zone temperature. A lower intake air condition
results in longer ignition delay and increases the initial rate of combustion.<br>AFRIKAANSE OPSOMMING: Die hoofparameters en toerusting wat in ag geneem moet word om uitlaatgasemissies in
dieselenjins te verminder en om enjinkraguitset te verhoog, is inlaatdruk, inlaat
lugtemperatuur, verbrandingskamerontwerp en brandstofinspuittoerusting. Inlaatdruk
word beheer deur die turb-aanjaer. Met hoë effektiwiteit, veranderlike geometrie turboaanjaging,
is effektiewe beheer moontlik om lugvloei-tempo deur die enjin te verhoog
onder alle enjinwerkstoestande. Effektiewe lug-tot-lug tussenverkoeling laat die enjin
met koeler inlaatlug vul, wat 'n uitwerking het op enjinlewensduur en hitte-verlies na die
verkoelingsstelsel. Die hoofdoel van die navorsing is om die invloed van inlaatdruk en
inlaat lugtemperatuur op dieselverbranding te ondersoek. Sodoende kry die navorser 'n
beter begrip omtrent die prosesse waar inlaatdruk verhoog en inlaat lugtemperatuur
verlaag word, om rem-gemiddelde effektiewe druk van die enjin te verhoog en uitlaatgas
emissies te verlaag.
'n 25-punt matriks is opgestel deur die enjin by verskillende inlaatdrukke en inlaat
lugtemperture te opereer, en by drie verskillende wringkragwerkstoestande. 'n Aantal
belangrike gevolgtrekkings is gemaak omtrent enjinwerking onder verskillende
werkstoestande na voltooiing van die enjintoetse, dataverwerking en data-evaluering.
Sodoende het die navorser bepaal hoe inlaatdruk en inlaat lugtemperatuur kraglewering,
brandstofverbruik, enjinlewensduur en uitlaatgasemissies beïnvloed. Om bogenoemde
begrippe verder te ondersteun is 'n meervoudige, lineëre regressiemodel opgestel om te
bepaal watter enjinparameters (afhanklike veranderlikes) 'n wesenlike effek op emissiegenerasie
en lewensduur het.
Van die data word afgelei dat inlaatdruk 'n positiewe effek op die meeste enjinparameters
het, omdat hoër inlaatdruk die lugvloeitempo deur die enjin verhoog. Hoër lugmassavloei
verminder verbrandingsgastemperatuur as gevolg van 'n hoër oortollige lugverhouding
tydens verbranding.
'n Verdere gevolg van 'n hoër oortollige lugverhouding is dat minder roet gevorm word
gedurende die eerste verbrandingsfase en meer roet en gedeeltelik verbrande
koolwaterstofverbindings oksideer gedurende die finale verbrandingsfase. Dus, met 'n
hoër inlaatdruk word Bosch rookemmissies verlaag. Geen wesenlike verandering in
rookkonsentrasies word egter gesien met 'n verandering in inlaatlugtemperatuur nie,
behalwe by baie lae inlaatdruk- en hoë inlaat lugtemperatuur-toetskondisies waar lae
lug/brandstofverhoudings bestaan en 'n klein toename in lugmassavloei as gevolg van
laer inlaat lugtempertuur'n groot invloed het.
Stikstofmonoksied (NO) emissies is meer afhanklik van inlaat lugtemperatuur as
inlaatdruk. Dit is bewys in die meervoudige regressiemodel. Die vlamsone- en die navlamsone-
temperatuur speel 'n groot rol in NO vorming. Inlaat lugtemperatuur beïnvloed
die temperatuur van die onstekingsmengsel en die daaropvolgende vlamsonetemperatuur.
'n Laer inlaat lugtemperatuur veroorsaak 'n langer onstekingsvertraging en
verhoog die aanvanklike verbrandingstempo.
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Thompson, David Brandon. "Development of Methods for Protein Delivery and the Directed Evolution of Recombinases." Thesis, Harvard University, 2014. http://nrs.harvard.edu/urn-3:HUL.InstRepos:13097816.
Full textAbstract:
As a class, protein-based therapeutics offer tremendous advantages over traditional small molecule drugs. Due to their sizes and folding energies, proteins are ideal for catalyzing chemical reactions, and can bind tightly and selectively to extended target surfaces. However, due to their large size, virtually all proteins are unable to spontaneously enter cells, and as a result protein therapeutics are restricted to extracellular targets. We developed a platform for delivery of proteins to intracellular target sites by engineering the surface chemistry of a model protein, green fluorescent protein (GFP). We found that 'supercharged' cationic GFP variants (scGFPs) bind to anionic cell surface molecules and initiate endocytosis, resulting in the efficient delivery of translationally fused cargo to intracellular targets. We discovered that scGFPs, and cationic delivery reagents in general, alter endosomal trafficking in a manner proportional to both their charge and their delivery efficiency, suggesting that avoidance of endosomal maturation is a key step in the endosomal escape of delivered protein cargos. We also developed a method for encapsulation of recombinant proteins by cationic lipid delivery reagents using negatively supercharged GFP.
Genetic modification technologies have matured rapidly following the discovery of protein classes with programmable DNA-binding specificities. While site-directed genetic knockout technologies are highly effective, targeted integration and repair remain comparatively inefficient. Site-specific recombinases directly catalyze strand exchange and ligation between DNA molecules, offering an approach to efficient genomic integration. However, most site-specific recombinases are not easily reprogrammable. To address this problem, we developed a genetic selection technique based on the Phage-Assisted Continuous Evolution (PACE) system, to enable the rapid evolution of recombinase proteins towards targets of interest. Using Cre recombinase as a model, the PACE system was optimized, validated, and used to evolve Cre variants with higher activity on their native loxP target site, as well as altered specificity towards a human genomic sequence within the hROSA26 locus.
Finally, we developed a method for enhancing the specificity of RNA-guided nucleases by restricting activity to sites of obligate dimeric nuclease assembly. We engineered a FokI nuclease fusion to a catalytically inactivated Cas9 protein that mediates efficient modification with significantly reduced off-target activity.
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Бляут, Ю. Є. "Автоматична ідентифікація помпажних характеристик газоперекачувальних агрегатів з газотурбінним приводом для ефективного антипомпажного регулювання". Thesis, Івано-Франківський національний технічний університет нафти і газу, 2013. http://elar.nung.edu.ua/handle/123456789/4431.
Full textAbstract:
Дисертація присвячена питанню автоматичної ідентифікації помпажних характеристик відцентрових нагнітачів газоперекачувальних агрегатів дотискувальних компресорних станцій підземних сховищ газу. Проведено класифікацію способів ідентифікації помпажних характеристик відцентрових нагнітачів з газотурбінним приводом. Теоретично досліджено зв'язок ступеня підвищення тиску газу на виході відцентрового нагнітача з масовою витратою газу, що зумовлено зміною режиму роботи газоперекачувального агрегату. Визначено частотні характеристики та функцію передачі відцентрового нагнітача. Отримано вираз залежності ступеня підвищення тиску газу від масової витрати газу, який використано для автоматичної ідентифікації помпажних характеристик газоперекачувального агрегату. Досліджено вплив кроку дискретизації інформативних параметрів на час перехідного процесу системи автоматичного керування газоперекачувальним агрегатом. Розроблено новий метод автоматичної ідентифікації помпажних характеристик відцентрового нагнітача газоперекачувального агрегату з газотурбінним приводом, який реалізовано на базі удосконаленої методики визначення його витратно-напірних характеристик. Удосконалено загальну структуру системи автоматичного керування газоперекачувальним агрегатом і програмне забезпечення підсистеми автоматичної ідентифікації помпажних характеристик відцентрових нагнітачів дотискувальної компресорної станції, які прийняті в промислову експлуатацію на ДКС «Більче-Волиця» і «Дашава» філії УМГ «Львівтрансгаз».<br>Диссертация посвящена вопросам автоматической идентификации помпажных характеристик центробежных нагнетателей газоперекачивающих агрегатов дожимных компрессорных станций подземных хранилищ газа. Опыт эксплуатации дожимных компрессорных станций подземных хранилищ газа показал, что традиционная идентификация помпажных характеристик газоперекачивающих агрегатов с газотурбинным приводом осуществляется на основе обработки паспортных данных или фактических характеристик центробежных нагнетателей газоперекачивающих агрегатов. При решении этой задачи имеет место неопределенность в априорной информации, которая может ухудшить оценки или они вообще могут потерять смысл. Обоснована и доказана целесообразность разработки универсального способа и системы автоматической идентификации помпажных характеристик для однотипных центробежных нагнетателей не зависимо от типа авиационного газотурбинного привода. Предложен новый метод автоматической идентификации помпажных характеристик центробежного нагнетателя газоперекачивающего агрегата как объекта управления, который реализован на основе усовершенствованной методики определения его расходно-напорных характеристик. Он позволяет определять реальные помпажные характеристики для каждого типа нагнетателя в режиме реального времени, что позволяет реализовать более точное регулирование нагнетателя антипомпажным клапаном, что в свою очередь влияет на снижение аварийности при работе в переходных и передпомпажных режимах и обеспечивает экономию пускового и топливного газа. Определена передаточная функция центробежного нагнетателя, его дифференциальное уравнение, которое использовали для решения задачи автоматической идентификации помпажных характеристик. На основе исследований влияния шага дискретизации информативных параметров на время регулирования системы автоматического регулирования газоперекачивающим агрегатом выбрали оптимальный шаг дискретизации, что позволило уменьшить продолжительность переходного процесса системы. Усовершенствована общая структура системы автоматического управления газоперекачивающим агрегатом и программное обеспечение подсистемы автоматической идентификации помпажных характеристик центробежных нагнетателей дожимной компрессорной станции.
Разработанная система автоматической идентификации помпажных характеристик центробежных нагнетателей принята в промышленную эксплуатацию на дожимных компрессорных станциях «Бильче-Волица» и «Дашава» филиала УМГ «Львовтрансгаз».<br>The thesis is devoted to the issue of the automatic identification of the surgin characteristics of centrifugal superchargers for gas-compressor units of booster compressor station in the underground gas storage facilities. The identification methods of the surgin characteristics for centrifugal superchargers equipped with the gas turbine drive have been determined. The dependence of gas pressure ratio of the centrifugal supercharger on gas mass flux caused by change of the gas-compressor unit operating mode has been analyzed theoretically. The frequency curves and transfer function of the centrifugal supercharger have been determined. Formula of gas pressure ratio dependence on gas mass flux was obtained and used for automatic identification of the surgin characteristics of the gas-compressor unit. Influence of sampling rate of the gas-compressor unit information-bearing parameters was studied. The unshocked nondestructive method of the automatic identification of the surgin characteristics for the centrifugal supercharger with the gas turbine drive has been developed and implemented based on improved techniques for determing its flow and head-capacity characteristics. The general structure of the automatic control system by means of the gas-compressor unit was improved and together with subsystem software of the automatic identification of the surgin characteristics for centrifugal superchargers of the boosting compressor station was brought into pilot production at BCS "Bilche-Volytsya" and "Dashava" branch of PLD "Lvivtransgas".
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Bauza, Erik. "Pryžový tlumič torzních kmitů čtyřválcového vznětového motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-228974.
Full textAbstract:
A content of this diploma thesis is construction design of torsional vibration rubber damper of four-stroke diesel supercharged engine. It` s realized evaluation of crankshaft from aspect of torsional vibrations and checked mechanical stress of crankshaft without using rubber damper. Consequently basic parameters of rubber damper are specified, then checked mechanical stress of crankshaft and designed own construction design of damper.
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Brahim, Bessem. "Etude de la stabilité des interactions ioniques en phase gazeuse : application aux complexes biologiques." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2014. http://tel.archives-ouvertes.fr/tel-00978816.
Full textAbstract:
Les interactions non-covalentes (NCI pour Non-Covalent Interactions) stabilisant les complexes non-covalents biologiques (NCX pour Non-Covalent compleXes) régissent la majorité des processus cellulaires indispensables au développement et au bon fonctionnement de tout organisme vivant. Toutes les fonctions de l'ADN, tels que son conditionnement, sa réplication et la régulation de son expression, sont permises par la formation et la dissociation de NCI avec des protéines. La compréhension des bases de ces processus cellulaires de l'ADN au niveau moléculaire est un sujet d'actualité et d'une importance fondamentale. Des informations essentielles peuvent être obtenues par spectrométrie de masse (MS pour Mass Spectrometry) qui joue un rôle de plus en plus important dans ce domaine. Malgré la technologie avancée déjà mise en ¿uvre, le développement de nouveaux concepts d'ionisation et d'activation implémentent perpétuellement la MS. Les travaux de thèse exposés à travers ce manuscrit présente l'étude de la stabilité des NCI maintenant les NCX biologiques par la comparaison des voies de fragmentations observées en mode positif et en mode négatif mais aussi par l'application de certains concepts récents de la MS comme : (i) l'utilisation d'agents de " superchargement " et, (ii) le développement et l'utilisation d'une source V-EASI (pour Venturi Easy Ambiant Sonic-spray Ionization) permettant l'aspiration libre de la solution et la désorption/ionisation des analytes par la seule vélocité du gaz de nébulisation.
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Jelínek, Petr. "Návrh sacího traktu s variabilní délkou pro experimentální zážehový motor." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254363.
Full textAbstract:
This thesis discusses of the intake tract four-stroke ignition internal combustion engine and the filling efficiency and opportunities to increase this efficiency and consequently to optimize the course of torque and power at the specified serial engine. 3D model is the last point of this thesis.
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Роговий, Андрій Сергійович. "Розробка теорії та методів розрахунку вихорокамерних нагнітачів". Thesis, Харківський національний автомобільно-дорожній університет, 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/29275.
Full textAbstract:
Дисертація на здобуття наукового ступеня доктора технічних наук за спеціальністю 05.05.17 – гідравлічні машини та гідропневмоагрегати. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2017.
У дисертаційній роботі розв'язано науково-практичну проблему підвищення техніко-економічної ефективності гідравлічних і пневматичних нагнітачів, що перекачують рідини в несприятливих умовах експлуатації або гетерогенні середовища, за рахунок розробки і використання принципово нового типу струминних нагнітачів відцентрової дії. Їх конструкція не містить рухомих механічних частин, а також ущільнень, завдяки чому вони мають високі показники надійності і довговічності притаманні струминній техніці. Концепція нагнітачів базується на новому для струминних нагнітачів принципі – поєднанні позитивних якостей процесів у відцентрових і струминних нагнітачах та особливостях гідродинаміки обмежених обертових потоків. Використання вихорокамерних нагнітачів дозволяє підвищити енергоефективність гідравлічних і пневматичних систем, збільшити обсяг переміщуваних вантажів в гідравлічному і пневматичному трубопровідному транспорті, підвищити продуктивність праці і якість продукції, знизити її собівартість, поліпшити умови роботи. Розроблені нагнітачі є більш енергоефективними, внаслідок передачі енергії в полі відцентрової сили. Таким чином, створено наукові основи проектування струминних вихорокамерних нагнітачів для перекачування середовищ різних агрегатних станів.<br>Thesis for degree of Doctor of Science in Technique for speciality 05.05.17 – hydraulic machines and hydropneumatic units. – National Technical University "Kharkiv Polytechnical Institute", Kharkiv, 2017.
In dissertational work the scientifically-practical problem of technical and economic efficiency increase of the hydraulic and pneumatic superchargers which are pumping over liquids in adverse service conditions or heterogeneous environments, at the expense of designing and use of essentially new type of jet superchargers of centrifugal action is solved. Their design does not contain mobile mechanical parts, and also sealing due to the fact that they have high indicators of reliability and durability inherent in jet technics. Conception of superchargers is based on a principle new to jet superchargers – unification of processes properties in centrifugal and jet superchargers and hydrodynamics features of the limited rotating streams. Use of vortex chamber superchargers allows to raise power efficiency of hydraulic and pneumatic systems, to increase volume of moved cargoes in hydraulic and pneumatic pipeline transport, to raise productivity of work and quality of production, to lower its cost price, to improve working conditions. The developed superchargers are more power effective, owing to transmission of energy in the field of centrifugal force. Thus, scientific bases of designing jet vortex chamber superchargers for transportation environments of different aggregation states are created.
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Роговий, Андрій Сергійович. "Розробка теорії та методів розрахунку вихорокамерних нагнітачів". Thesis, НТУ "ХПІ", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/29269.
Full textAbstract:
Дисертація на здобуття наукового ступеня доктора технічних наук за спеціальністю 05.05.17 – гідравлічні машини та гідропневмоагрегати. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2017.
У дисертаційній роботі розв'язано науково-практичну проблему підвищення техніко-економічної ефективності гідравлічних і пневматичних нагнітачів, що перекачують рідини в несприятливих умовах експлуатації або гетерогенні середовища, за рахунок розробки і використання принципово нового типу струминних нагнітачів відцентрової дії. Їх конструкція не містить рухомих механічних частин, а також ущільнень, завдяки чому вони мають високі показники надійності і довговічності притаманні струминній техніці. Концепція нагнітачів базується на новому для струминних нагнітачів принципі – поєднанні позитивних якостей процесів у відцентрових і струминних нагнітачах та особливостях гідродинаміки обмежених обертових потоків. Використання вихорокамерних нагнітачів дозволяє підвищити енергоефективність гідравлічних і пневматичних систем, збільшити обсяг переміщуваних вантажів в гідравлічному і пневматичному трубопровідному транспорті, підвищити продуктивність праці і якість продукції, знизити її собівартість, поліпшити умови роботи. Розроблені нагнітачі є більш енергоефективними, внаслідок передачі енергії в полі відцентрової сили. Таким чином, створено наукові основи проектування струминних вихорокамерних нагнітачів для перекачування середовищ різних агрегатних станів.<br>Thesis for degree of Doctor of Science in Technique for speciality 05.05.17 – hydraulic machines and hydropneumatic units. – National Technical University "Kharkiv Polytechnical Institute", Kharkiv, 2017.
In dissertational work the scientifically-practical problem of technical and economic efficiency increase of the hydraulic and pneumatic superchargers which are pumping over liquids in adverse service conditions or heterogeneous environments, at the expense of designing and use of essentially new type of jet superchargers of centrifugal action is solved. Their design does not contain mobile mechanical parts, and also sealing due to the fact that they have high indicators of reliability and durability inherent in jet technics. Conception of superchargers is based on a principle new to jet superchargers – unification of processes properties in centrifugal and jet superchargers and hydrodynamics features of the limited rotating streams. Use of vortex chamber superchargers allows to raise power efficiency of hydraulic and pneumatic systems, to increase volume of moved cargoes in hydraulic and pneumatic pipeline transport, to raise productivity of work and quality of production, to lower its cost price, to improve working conditions. The developed superchargers are more power effective, owing to transmission of energy in the field of centrifugal force. Thus, scientific bases of designing jet vortex chamber superchargers for transportation environments of different aggregation states are created.
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Ковалів, Є. О. "Оптимальне керування роботою багатоцехових компресорних станцій з різними типами приводів". Thesis, Івано-Франківський національний технічний університет нафти і газу, 2005. http://elar.nung.edu.ua/handle/123456789/4058.
Full textAbstract:
Дисертація присвячена питанням розробки методу і алгоритмів оптимального керування роботою багатоцехових компресорних станцій з різними типами приводів. В дисертації комплексно вирішені питання побудови емпіричних моделей нагнітачів природного газу на основі даних, отриманих в процесі їх нормальної роботи, оптимізації роботи КС за вартісним критерієм, який враховує енергетичні затрати на компримування газу і обмеження на технологічні режими та синтезу системи оптимального керування роботою паралельно працюючих груп (цехів) компресорних агрегатів. Основні результати роботи знайшли промислове впровадження на КС УМГ "Прикарпаттрансгаз", а також в навчальному процесі.<br>Диссертация посвящена вопросам разработки метода и алгоритмов оптимального управления работой многоцеховых компрессорных станций с разными типами приводов. В диссертации комплексно решены вопросы построения эмпирических моделей нагнетателей природною газа на основе данных, полученных в процессе их нормальной работы, оптимизации работы КС по стоимостному критерию, который учитывает энергетические затраты на компромирования газа и ограничения на технологические режимы и синтеза системы оптимального управления работой параллельно работающих групп (цехов) компрессорных агрегатов. Основные результаты работы внедрены на КС УМГ "Прикарпаттрансгаз", а также в учебном процессе.<br>The thesis is devoted to problems of development of a method and algorithms of optimum control of operation of multishop compressor stations with different types of drives In a thesis the problems of constructing of trial-and-error models of superchargers of gas distillate are completely resolved on the basis of datas obtained during their normal operation, optimization of operation compressor station by cost yardstick, which one allows for power expenditures on contraction of gas and limitation on technological conditions and synthesis of a system of optimum control of operation of in a parallel way working compressor aggregates. The basic outcomes of operation are inserted on KS SF "Prykarpattransgas", and also in the educational process.
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Katona, Gregory. "Field Theoretic Lagrangian From Off-Shell Supermultiplet Gauge Quotients." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5958.
Full textAbstract:
Recent efforts to classify off-shell representations of supersymmetry without a central charge have focused upon directed, supermultiplet graphs of hypercubic topology known as Adinkras. These encodings of Super Poincare algebras, depict every generator of a chosen supersymmetry as a node-pair transformtion between fermionic / bosonic component
fields. This research thesis is a culmination of investigating novel diagrammatic sums of gauge quotients by supersymmetric images of other Adinkras, and the correlated building of field theoretic worldline Lagrangians to accommodate both classical and quantum venues. We find Ref [40], that such gauge quotients do not yield other stand alone or ”proper” Adinkras as afore sighted, nor can they be decomposed into supermultiplet sums, but are rather a connected ”Adinkraic network”. Their iteration, analogous to Weyl's construction for producing all finite-dimensional unitary representations in Lie algebras, sets off chains of algebraic paradigms in discrete-graph and continuous-field variables, the links of which feature distinct, supersymmetric Lagrangian templates. Collectively, these Adiankraic series air new symbolic genera for equation to phase moments in Feynman path integrals. Guided in this light, we proceed by constructing Lagrangians actions for the N = 3 supermultiplet YI /(iDI X) for I = 1, 2, 3, where YI and X are standard, Salam-Strathdee superfields: YI fermionic and X bosonic. The system, bilinear in the component fields exhibits a total of thirteen free parameters, seven of which specify Zeeman-like coupling to external background (magnetic) fluxes. All but special subsets of this parameter space describe aperiodic oscillatory responses, some of which are found to be surprisingly controlled by the golden ratio, ? ? 1.61803, Ref [52]. It is further determined that these Lagrangians allow an N = 3 ? 4 supersymmetric extension to the Chiral-Chiral and Chiral-twisted-
Chiral multiplet, while a subset admits two inequivalent such extensions. In a natural progression, a continuum of observably and usefully inequivalent, finite-dimensional off-shell
representations of worldline N = 4 extended supersymmetry are explored, that are variate
from one another but in the value of a tuning parameter, Ref [53]. Their dynamics turns
out to be nontrivial already when restricting to just bilinear Lagrangians. In particular, we
find a 34-parameter family of bilinear Lagrangians that couple two differently tuned supermultiplets to each other and to external magnetic fluxes, where the explicit parameter dependence is unremovable by any field redefinition and is therefore observable. This offers the evaluation of X-phase sensitive, off-shell path integrals with promising correlations
to group product decompositions and to deriving source emergences of higher-order background flux-forms on 2-dimensional manifolds, the stacks of which comprise space-time volumes. Application to nonlinear sigma models would naturally follow, having potential use in M- and F- string theories.<br>Ph.D.<br>Doctorate<br>Physics<br>Sciences<br>Physics
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Huanb, Shih-chi, and 黃世吉. "Performance Test and Analysis of a Supercharger." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/31460209751454403489.
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Tang, Chao-Renn, and 湯朝任. "Performance Test and Analysis of a Centrifugal Supercharger." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/75314970872970544721.
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Maly, Robert E. "Performance analysis of a two-lobed roots blower supercharger." 2002. http://catalog.hathitrust.org/api/volumes/oclc/50102553.html.
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Thesis (M.S.)--University of Wisconsin--Madison, 2002.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 109-110).
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Wu, Jiunn-Jong, and 吳俊忠. "The application of mechanical centrifugal type Supercharger for gasoline engine." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/87131779001178759534.
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碩士<br>國立臺北科技大學<br>車輛工程系碩士班<br>91<br>This study is made by experimental method for the purpose of improving the performance of mechanical centrifugal supercharger at low rotational speed in SI engine. The airflow quantity, compression and volume efficiency of mechanical centrifugal supercharger are reached more higher at higher engine speed range. In high-pressure ratio condition, the impeller and the volute casing are so difficult to seal completely that would increase leakage and decrease air flow quantity, compression and volume efficiency. However the maximum efficiency of supercharger will appear at lower pressure ratio. Besides higher rotational speed and pressure ratio make more difference in temperature between the inlet and outlet of the supercharger. At first, the MITSUBISHI 4G92 1600c.c. engine affords more stable power source of driving the supercharger unit and with which we build an apparatus of performance of the mechanical centrifugal supercharger to realize the information of supercharger capacity. Such as airflow rate, pressure ratio, increasing temperature and velocity of air flow in duct under different engine rotational speed and degree of throttle valve. According to the above information to estimate and equip the engine system of supercharger, that is measured the performance of engine power, airflow rate and different temperature between the inlet and outlet of the supercharger, comparing with natural aspirated engine situation. Meanwhile, the result is supported to improve the performance of mechanical centrifugal supercharge and to arrange with a mechanical centrifugal
supercharge of engine.
Referring to the experimental result, we figure out the performance of the horsepower, torque, pressure and air flow rate that is not increased outstandingly at low rotational speed area below 2000 rpm. Under WOT situation; when rotational speed reaches 2000 rpm horsepower increases 4.47% and torque increases 4.45% comparing with natural aspirated engine. Henceforth accompanies with engine rotational speed rising the torque and horsepower produced by the supercharged engine also increasing. When rotational speed reaches 5000 rpm horsepower increases 22.66% and torque increases 22.70% to attain maximum. The pressure in the duct of natural aspirated engine wills all maintain below atmospheric pressure condition. And accompanies with engine rotational speed to increase its pressure decreasing. For supercharged engine at the whole rotational speed scope all is keeping at higher than atmospheric pressure. Furthermore, the pressure and the airflow rate of duct of supercharged engine will increase with the engine speed under vary engine revolution. The quantity of supercharged airflow increases not obviously at low rotational speed area comparing
with natural aspirated engine.
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Sutar, Pawan. "Numerical Simulation of Pressure Wave Supercharger with Pockets Operating at Different Speeds." Thesis, 2020. http://hdl.handle.net/1805/25882.
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Indiana University-Purdue University Indianapolis (IUPUI)<br>Pressure wave supercharger is an application of wave rotor technology that utilizes compression waves produced by high-pressure engine exhaust gas to compress the fresh intake air within the channels. The phenomena within the wave rotor channels are governed by compression and expansion waves initiated when the channel ends are periodically exposed to differing pressure ports. Two incoming fluids are brought into contact for a very short amount of time to facilitate efficient energy and momentum transfer, thereby exchanging pressure dynamically between the fluids by means of unsteady pressure waves. Since the energy transfer is based on unsteady pressure waves, correct matching of waves and ports is essential for optimum results. Mistiming of the waves in the channels is detrimental to the efficient exchange of pressure and low-pressure exhaust scavenging, which ensures minimum exhaust gas recirculation. Due to varying speed and load conditions of the unit to be supercharged, it is not always possible to maintain the rotor speed constant at the design point.
To mitigate the effects of wave mistiming due to varying speed, a well-designed combination of wall-pockets was used in Comprex® pressure wave supercharger. The wall-pockets are the recesses provided in the endplates of pressure wave superchargers to create necessary pressure zones at desired locations. This thesis details an extensive qualitative and computational investigation of the performance of pressure wave superchargers with pockets. Numerical simulations of pressure wave superchargers have been performed using the wave rotor analysis codes employed at the Combustion and Propulsion Research Laboratory at IUPUI. This work also pays close attention to inspecting the numerical schemes and modeling of different physical phenomena used in each code. A comparative verification of the wave rotor analysis codes has been conducted to ensure that the same fundamental numerical scheme is correctly implemented in each code. The issue of low-pressure scavenging has been demonstrated by simulating the four-port (pocketless) pressure wave supercharger operating at lower speeds. The wall-pockets have been modeled using a simple lumped volume technique. The gas state in the lumped volume of pockets is estimated using the continuity and energy equations such that the net mass and energy fluxes between each pocket and the wave rotor channels are close to zero. The lumped volume models of pockets have been implemented in the four-port wave rotor configurations to simulate the pressure wave superchargers with pockets. The simulation results show that the pockets assist to maintain sufficient pressure in the desired zones to facilitate proper low-pressure scavenging during lower rotor speed operations. The Comprex simulation results have been observed to be in good agreement with experimental data and qualitative analysis. Specific observations on the performance of each code and comprehensive simulation results have been presented.
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(9750260), Pawan Jaysing Sutar. "NUMERICAL SIMULATION OF PRESSURE WAVE SUPERCHARGER WITH POCKETS OPERATING AT DIFFERENT SPEEDS." Thesis, 2021.
Find full textAbstract:
<div>Pressure wave supercharger is an application of wave rotor technology that utilizes compression waves produced by high-pressure engine exhaust gas to compress the fresh intake air within the channels. The phenomena within the wave rotor channels are governed by compression and expansion waves initiated when the channel ends are periodically exposed to differing pressure ports. Two incoming fluids are brought into contact for a very short amount of time to facilitate efficient energy and momentum transfer, thereby exchanging pressure dynamically between the fluids by means of unsteady pressure waves. Since the energy transfer is based on unsteady pressure waves, correct matching of waves and ports is essential for optimum results. Mistiming of the waves in the channels is detrimental to the efficient exchange of pressure and low-pressure exhaust scavenging, which ensures minimum exhaust gas recirculation. Due to varying speed and load conditions of the unit to be supercharged, it is not always possible to maintain the rotor speed constant at the design point.</div><div>To mitigate the effects of wave mistiming due to varying speed, a well-designed combination of wall-pockets was used in Comprex® pressure wave supercharger. The wall-pockets are the recesses provided in the endplates of pressure wave superchargers to create necessary pressure zones at desired locations. This thesis details an extensive qualitative and computational investigation of the performance of pressure wave superchargers with pockets. Numerical simulations of pressure wave superchargers have been performed using the wave rotor analysis codes employed at the Combustion and Propulsion Research Laboratory at IUPUI. This work also pays close attention to inspecting the numerical schemes and modeling of different physical phenomena used in each code. A comparative verification of the wave rotor analysis codes has been conducted to ensure that the same fundamental numerical scheme is correctly implemented in each code. The issue of low-pressure scavenging has been demonstrated by simulating the four-port (pocketless) pressure wave supercharger operating at lower speeds. The wall-pockets have been modeled using a simple lumped volume technique. The gas state in the lumped volume of pockets is estimated using the continuity and energy equations such that the net mass and energy fluxes between each pocket and the wave rotor channels are close to zero. The lumped volume models of pockets have been implemented in the four-port wave rotor configurations to simulate the pressure wave superchargers with pockets. The simulation results show that the pockets assist to maintain sufficient pressure in the desired zones to facilitate proper low-pressure scavenging during lower rotor speed operations. The Comprex simulation results have been observed to be in good agreement with experimental data and qualitative analysis. Specific observations on the performance of each code and comprehensive simulation results have been presented.</div>
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Макаров, И. С., та I. S. Makarov. "Исследование факторов, влияющих на прочность и надежность рабочих колес нагнетателя Н-380-18-1 : магистерская диссертация". Master's thesis, 2019. http://hdl.handle.net/10995/76702.
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В работе проведен анализ причин повреждения рабочих колес центробежных нагнетателей, проведены сравнительные расчеты колес обычного и подрезанного типов, проанализированы результаты.<br>The paper analyzes the causes of damage to the impeller of centrifugal blowers, comparative calculations of wheels of conventional and clipped types, analyzed the results.
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李光偉. "The Performance Test of a Centrifugal Supercharged Engine." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/07904117901361215537.
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Wang, Kevin, and 王志凱. "Study on the Fuel Injection System of a Supercharged Engine." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/01765163743876158128.
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He, Jun-Hui, and 何俊輝. "Using CFD to Calculate the Supercharged Flow of IC Engine Through Exhaust Pressure." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/63396191869972678398.
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碩士<br>國立臺灣大學<br>機械工程學研究所<br>92<br>The exhaust emission of two-stroke motorcycle engine is more serious than that of four-stroke engine, so it will be eliminated. But most of 50 c.c. motorcycles use two-stroke engines. The four-stroke 50 c.c. motorcycle will have the problem of lower power output, so we have to increase the power output of the engine. About one-third of input energy of internal combustion engine is released to ambient by exhaust gas. If we use the exhaust gas of engine to drive a supercharger that will increase the performance of engine, and can further reduce the exhaust emission.
By reviewing the history of supercharged internal combustion engine; we found out that almost all of supercharged methods have been developed was used for car or truck, none of them can be used for motorcycle. So designing a supercharger for motorcycles will be a subject that is worthy of studying.
This research used the principle of piston motion. There is a slider in the cylinder that is separated to exhaust chamber and fresh air chamber by this slider. Two small pipes were attached at the ends of cylinder. The fresh air chamber attached to the region in front of inlet throttle, and the exhaust chamber attached to the exhaust pipe of engine. The pressure difference between two sides of slider makes the slider to move in the cylinder that can boost the fresh air in the fresh air chamber to flow into the engine cylinder. That can increase the volumetric efficiency, and hence improve the engine performance.
This research used the computational fluid dynamic software “CFD-RC” to simulate the said supercharger. In the different operation condition, we analyze the supercharging pressure and the mass flow rate of this supercharger.
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Conrad, Jan [Verfasser]. "Orbifolds and Kaluza-Klein monopoles in heterotic E8 × E8 string theory preserving eight supercharges / vorgelegt von Jan Conrad." 2002. http://d-nb.info/96727639X/34.
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