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Dissertations / Theses on the topic 'Two-stroke engines'

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Published: 4 June 2021

Last updated: 31 May 2022

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1

Nandkumar, Subhash. "Two-stroke linear engine." Morgantown, W. Va. : [West Virginia University Libraries], 1998. http://etd.wvu.edu/templates/showETD.cfm?recnum=153.

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Thesis (M.S.)--West Virginia University, 1998.
Title from document title page. Document formatted into pages; contains x, 82 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 69-70).

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2

Reid, Michael George Oliver. "Combustion modelling for two-stroke cycle engines." Thesis, Queen's University Belfast, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333848.

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3

Houdyschell, David. "A diesel two-stroke linear engine." Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1312.

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Thesis (M.S.)--West Virginia University, 2000.
Title from document title page. Document formatted into pages; contains ix, 64 p. : ill. (some col.) Includes abstract. Includes bibliographical references (p. 42-43).

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4

McKinley, Nigel Robert. "Two-stroke engine in-cylinder flow structures." Thesis, Queen's University Belfast, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241416.

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5

Creaven, John Peter. "Modelling and evaluation of two-stroke engine scavenging." Thesis, Queen's University Belfast, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266700.

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6

Raghunathan, Bharat Damodar. "Two-stroke engine in-cylinder and duct flows." Thesis, Queen's University Belfast, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318779.

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7

Doherty, Kieran Patrick Joseph. "An investigation of a two-stroke crosshead biogas engine." Thesis, Queen's University Belfast, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241389.

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8

Fitzsimons, James Brian. "An investigation of the influence of the bore/stroke ratio in a two-stroke cycle engine." Thesis, Queen's University Belfast, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264008.

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9

Disseau, Mael Leo David Soliman. "Development and investigation of a small, high aspect ratio, two-stroke engine." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/12485.

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10

Carson, Christopher Edward. "An investigation of stratified charging of two-stroke engines." Thesis, Queen's University Belfast, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241331.

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11

Yu, Larry Liaobo. "A CFD study on direct injection two-stroke engines." Thesis, Glasgow Caledonian University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287858.

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This thesis presents the research on direct-fuel-injection (DFI) performance analyses of the two-stroke engine using computational fluid dynamics (CFD). The aims of this research are: (1) to generate a finite volume mesh that can be used to simulate the moving of the piston and opening and closing the ports of the cylinder, (2) to achieve an numerical flow pattern of the scavenging process and (3) to study the DFI process using the mesh and the flow pattern obtained from the first two parts. The three parts in the analyses, therefore, are the engine geometry modelling, scavenging process modelling and DFI modelling. CFD software STAR-CD was used to write the programme and perform the analysis. The geometry model used a moving mesh mechanism with variable openings to simulate the piston motion and port area changes. The scavenging model was constructed to calculate 3D, compressible, turbulent, transient flow with heat transfer and changing volume. Results of the calculation provided a large number of data, including flow patterns, pressure and temperature distributions and fresh-charge concentrations. The DFI process was simulated as a gasliquid two-phase flow. Fuel droplets dispersed in the continuous gas phase were calculated using the Lagrangian model. Four DFI cases that differ in position and number of injectors were simulated. Fuel droplet distribution, including droplet size, velocity, temperature and position, and fuel-vapour concentration were obtained. The result of the geometry modelling shows that the finite volume programme performed well for this particular task. Because of the limitation of the computer hardware used, this programme was restricted to be used for the simulation of the engine process before the ignition, i. e., cold running condition, therefore, combustion process was not included. The findings from the analyses, with very limited resources, would help improve the engine design. The results of all four cases indicate that, even only for the period of engine process before the ignition, the DFI two-stroke engine can significantly reduce hydrocarbon emissions compared with the conventional carburettor engine.

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12

Kee, Robert J. "Stratified charging of a cross-scavenged two-stroke cycle engine." Thesis, Queen's University Belfast, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335987.

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13

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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14

Houston, Rodney Alexander Rowney. "Performance modelling of multi-cylinder, Reed value, two-stroke cycle engines." Thesis, Queen's University Belfast, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356871.

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15

Cunningham, Geoffrey. "An investigation into the lubrication of crankcase scavenged two-stroke cycle engines." Thesis, Queen's University Belfast, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337686.

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16

Gillespie, George Thompson. "Direct fuel injection of a QUB cross scavenged two-stroke cycle engine." Thesis, Queen's University Belfast, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356915.

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17

Donohoe, Paul Molua David. "Practical and theoretical development of a natural gas fuelled two-stroke engine." Thesis, Queen's University Belfast, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333805.

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18

Callahan, B. J. "Modelling and evaluation of two-stroke and four-stroke engines with in-cycle speed fluctuations." Thesis, Queen's University Belfast, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.411036.

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19

Smyth, J. Gary. "An experimental and theoretical study of scavenging in two-stroke cycle engines." Thesis, Queen's University Belfast, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334491.

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20

Thornhill, David James. "The design and development of a multi-cylinder, automotive, two-stroke cycle engine." Thesis, Queen's University Belfast, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388069.

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21

Chen, Changyou. "A study of high output two-stroke diesel engines : scavenging, supercharging and compounding." Thesis, University of Bath, 1986. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306082.

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22

McNiff, Martin Peter. "An investigation of the influence of bore/stroke ratio and cylinder design on scavenging in a two-stroke cycle, spark ignition engine." Thesis, Queen's University Belfast, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263967.

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23

McEntee, Paul Thomas. "Modelling and evaluation of a high performance two-stroke engine under dynamic operating conditions." Thesis, Queen's University Belfast, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300618.

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24

Cochrane, James Andrew. "An experimental and theoretical investigation of a three cylinder two-stroke cycle automotive engine." Thesis, Queen's University Belfast, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324955.

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25

Campbell, Donald James. "A theoretical and experimental investigation into the scavenge process of a two-stroke engine." Thesis, Queen's University Belfast, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263966.

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26

Shoukry, Ehab F. "Numerical simulation for parametric study of a two-stroke compression ignition direct injection linear engine." Morgantown, W. Va. : [West Virginia University Libraries], 2003. http://etd.wvu.edu/templates/showETD.cfm?recnum=3071.

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Thesis (Ph. D.)--West Virginia University, 2003.
Title from document title page. Document formatted into pages; contains xxvii, 166 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 121-126).

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27

Cartwright, Anthony. "Computer simulation of high performance, reed valve induction, two-stroke cycle engines." Thesis, Queen's University Belfast, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318929.

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28

Sweeney, Mark Eugene. "A direct assessment of the scavenging efficiency of two-stroke cycle engines." Thesis, Queen's University Belfast, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235854.

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29

McCluney, Peter. "Development of a small natural gas fuelled two stroke cycle engine using low pressure injection." Thesis, Queen's University Belfast, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241433.

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30

Miller, Annesley John. "The computer simulation of a low-speed, low specific performance, spark ignition, two-stroke cycle engine." Thesis, Queen's University Belfast, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357450.

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31

Magee, Samuel John. "Investigation of the performance and emissions characteristics of small capacity two-stroke cycle engines." Thesis, Queen's University Belfast, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388072.

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32

Ng, Kung. "Investigation of gas exchange processes in the ports and cylinder of two-stroke engines." Thesis, King's College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392145.

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33

Andersson, Johan, and Oscar Wyckman. "Modeling of Fuel Dynamics in a Small Two-Stroke Engine Crankcase." Thesis, Linköpings universitet, Fordonssystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-119061.

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For any crankcase scavenged two-stroke engine, the fuel dynamics is not easily predicted. This is due to the fact that the fuel has to pass the crankcase volume before it enters the combustion chamber. This thesis is about the development of a model for fuel dynamics in the crankcase of a small crankcase scavenged two-stroke engine that gives realistic dynamic behavior. The crankcase model developed in this thesis has two parts. One part is a model for wall wetting and the other part is a model for concentration of evaporated fuel in the crankcase. Wall wetting is a phenomenon where fuel is accumulated in fuel films on the crankcase walls. The wall wetting model has two parameters that have to be tuned. One is for the fraction of fuel from the carburetor that is not directly evaporated and one parameter is for the evaporation time of the fuel film. The thesis treats tuning of these parameters by running the model with input data from measurements. Since not all input data are possible to measure, models for these inputs are also needed. Hence, development of simple models for air flows, fuel flow, gas mixing in the exhaust and the behavior of the λ-probe used for measurements are also treated in this thesis. The parameter estimation for the crankcase model made in this thesis results in parameters that corresponds to constant fraction of fuel from the carburetor that evaporates directly and a wall wetting evaporation rate that increases with increasing engine speed. The parameter estimation is made with measurements at normal operation and three specific engine speeds. The validity of the model is limited to these speeds and does not apply during engine heat-up. The model is run and compared to validation data at some different operation conditions. The model predicts dynamic behavior well, but has a bias in terms of mean level of the output λ. Since this mean value depends on the relation between input air and fuel flow, this bias is probably an effect of inaccuracy in the simple models developed for these flows.
För alla tvåtaktsmotorer med bränslematning genom vevhuset är bränsledynamiken svårpredikterad. Detta beror på att bränslet måste passera vevhusvolymen innan det når förbränningskammaren. Denna uppsats handlar om utveckling av en modell som ger realistisk dynamik för bränslet i tvåtaktsmotorers vevhus. Vevhusmodellen i denna uppsats har två delar. Den ena delen är en modell för bränslefilm på motorväggar och den andra delen är en modell för koncentration av förångat bränsle i vevhusvolymen. Bränslefilmsmodellen har två parametrar som måste trimmas. Den ena är andelen bränsle från förgasaren som inte förångas direkt och den andra är tidsåtgången för förångning av bränslefilmen. Uppsatsen behandlar trimning av dessa parametrar genom körning av modellen med indata från mätningar. Eftersom inte all indata kan mätas behövs även modeller för dessa. Därför behandlar uppsatsen även utveckling av enkla modeller för luftflöde, bränsleflöde, gasblandning i avgasvolymen och beteende hos den för mätningar använda λ-sonden. Parameterestimeringen för vevhusmodellen som är gjord i denna uppsats resulterar i parametrar som svarar mot konstant andel av bränslet från förgasaren som förångas direkt och en förångningshastighet för bränslefilmen som ökar med ökande motorhastighet. Parameterestimeringen är gjord med mätdata från normal körning vid tre olika motorhastigheter. Giltigheten för modellen är begränsad till dessa hastigheter och kan inte appliceras på körning av motorn vid kallstart. Modellen är körd och jämförd med valideringsdata från olika körfall. Modellen förutser dynamiska beteenden väl, men har ett systematiskt fel gällande medelvärdet på λ. Eftersom detta medelvärde beror på förhållandet mellan luftflöde och bränsleflöde in i vevhuset är sannolikt detta systematiska fel en effekt av osäkerhet i de enkla modeller som utvecklats för dessa flöden.

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34

Grauer, Diana Kathryn. "Simulation and optimization of non-isothermal compressible flow through large-bore two-stroke cycle natural gas transmission engines." Diss., Manhattan, Kan. : Kansas State University, 2010. http://hdl.handle.net/2097/4230.

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35

Carberry, Brendan Patrick. "A theoretical and experimental investigation of the characteristics of automotive catalytic converters for use on two-stroke cycle engines." Thesis, Queen's University Belfast, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310149.

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36

Adomavičius, Linas. "Hydrodynamical investigation of the two-stroke engine." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20110701_094027-36079.

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Inside the master thesis there is represented computer simulation program of the gas flow through the two-stroke engine. The simulation program is developed in software package “Fortran” and is represented as Annex 2. The program simulates gas flow through the two-stroke engine and gives results of pressure changes and mass flow. The simulation is done by using concentrated volume method. The pressure inside the engine parts is described by pressure changes equation. The program is intended for the two-stroke engine tuning for the race. In the thesis is deeply investigated small swept volume engine used for tether model car race. Using the program is possible to do engine inlet and transfer timing optimization. The optimization results were very successful and showed that the cylinder filling with fresh air fuel mixture can be increased by 0.5%. For the numerical solution of the first order differential equations there were used Runge-Kutta IV method.
Magistriniame darbe pristatoma dvitakčio variklio modeliavimo programa, kuri apskaičiuoja dujų tekėjimą dvitakčiame variklyje. Programa sukurta naudojantis programiniu paketu „Fortran“ ir pateikta antrame priede. Programa modeliuoja dujų tekėjimą dvitakčiame variklyje ir pateikia slėgio bei debito rezultatus. Modeliavimui taikytas koncentruotų tūrių metodas. Slėgiai variklio dalyse yra aprašomi slėgio kitimo formule. Programa skirta lenktyniniams dvitakčiams varikliams, jų galiai didinti. Darbe labai smulkiai analizuojami mažo darbinio tūrio varikliai, kurie naudojami automobilių modelių greičio varžybose. Naudojant programą įmanoma atlikti variklio įsiurbimo ir prapūtimo fazių optimizavimą. Optimizavimo rezultatai rodo, kad galima pagerinti cilindro užpildymą šviežiu oro-kuro mišiniu net 0,5 % - tai yra labai geras rezultatas, kadangi dvitakčiai varikliai yra labai išvystyti. Pirmo laipsnio diferencialinėms lygtims spręsti panaudotas skaitinis Rungės-Kuto IV metodas.

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37

GOUVEIA, MARCIO DE CASTRO. "NUMERICAL SIMULATION OF A TWO-STROKE ENGINE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1989. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=20386@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
Neste trabalho, foi desenvolvida uma simulação numérica do processo de lavagem para um motor de dois tempos, com pistão chato. O ar entra circunferencialmente no cilindro, induzindo um escoamento turbulento tri-dimensional. O problema foi modelado assumindo axissimétrico, em regime permanente, através de um cilindro com temperatura uniforme nas paredes. O regime permanente foi simulado , assumindo o pistão fizo no ponto morto inferior. Os campos de velocidade e temperatura foram obtidos utilizando o modelo de turbulência K-E. Os reultados foram comparados com dados experimentais de um escoamento que simula o processo de lavagem no interior de um cilindro em regime permanente. Observou-se uma boa concordância entre os dados. Realizou-se também, uma comparação com uma solução numérica disponível, mostrando ter o presente trabalho comportamento superior, com soluções mais próximas às experimentais. Investigou-se o efeito do número de Reynolds, dos ângulos de entrada do gás e da geometria do motor no escoamento e no processo de troca de calor. Pode-se concluir que o número de Reynolds, a razão de aspectos e a localização da saída são os principais parâmetros do processo de lavagem.
A numerical simulation of the scavenging process in a two-stroke flat-piston model engine has been developed. Air enterns the cylinder circunferentially , inducing a 3-D turbulent swirling flow. The problem was modeled as a steady state axi-symetric flow through a cylinder with uniform wall temperature. The steady state regime was simulated by assuming the piston head fized at the bottom dead center. The calculation was performed employing the K-E model of turbulence. A comparison of the results obtained for the flow field with available experimental data showed very good agreement, and a comparison with available numerical solution revealed superior results. The effect of the Reynolds number, the inlet port angles, and engine geometry on the flow and heat transfer characteristics were investigated. It can be conclude that main parameters for the scavenging process are the Reynolds number, aspect ratio and type of the outflow exit.

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38

McElligott, Shane. "Stratified scavenging of a small capacity two-stroke engine." Thesis, Queen's University Belfast, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394884.

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39

Patterson, Douglas T. "Tribopolymerization as an approach to two-stroke engine lubrication." Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-01312009-063142/.

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40

Haataja, Freddi. "Electronic throttle control in a small two-stroke engine." Thesis, KTH, Maskinkonstruktion (Inst.), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-192309.

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This thesis covers the design and prototyping of an electronic throttle control (ETC) system for a small two-stroke engine. The thesis work is being realized in collaboration between a cooperating company and KTH. The throttle control system is veried with a physical combustion engine. The development process of the control systems is being done mostly in-house in the cooperating company. The company has developed electronic control of fuel and ignition system. In addition to the ETC throttle control system this thesis work also develops a control system of the angular velocity of the combustion engine by controlling the intake air to the small two-stroke engine. Today the air supply to the engine is controlled by a valve mechanically connected to the trigger/gas pedal operated by the user. The focus of the thesis is to investigate the advantages and drawbacks of implementing an electronically controlled air supply to a small two-stroke combustion engine. This master thesis discuss the detailed system design requirement of an ETC system for a small two-stroke engine. The result of this master thesis shows that it is possible to have velocity control on a small two-stroke engine, also minor improvements in acceleration of the small combustion engine is shown when using the ETC system.
Detta examensarbete omfattar design och prototypbygge av ett elektroniskt gasreglagesystem (ETC) for en liten tvataktsmotor. Examensarbetet utfors som ett sammarbete mellan ett sammarbetande foretag och KTH. Gasreglagesystemet verieras med en fysisk forbranningsmotor. Utvecklingsprosessen av styrsystemet bedrivs mestadels internt hos det sammarbetande foretaget. Foretaget har utvecklat elektronisk styrning av bransle och tandsystem. Utover det elektroniska gasreglagesystemet har detta examensarbete ocksa behandlat utvecklingen av ett styrsystem av vinkelhastigheten hos forbranningsmotorn genom att styra insugsluften till den lilla tvataktsmotorn. Idag styrs lufttillforseln till forbranningsmotorn av ett spjall som ar mekaniskt ansluten till avtryckaren som manovreras av anvandaren. Fokus for examensarbetet ligger i att undersoka for- och nackdelar med att implementera ett elektroniskt styrt luftspjall till en liten tva-taktsmotor. Examensarbetet behandlar det detaljerade designkravet hos ett ETC system for en liten tvataktsmotor. Resultatet av detta examensarbete visar att det ar mojligt att ha hastighetsstyrning pa en liten tvataktsmotor, aven sma forbattringar i acceleration pavisas nar ETC systemet anvands.

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41

Lewis, Daniel. "A quasi-dimensional spark ignition two stroke engine model." Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/14808.

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Despite challenges with poor emissions and fuel economy, gasoline two stroke engines continue to be developed for a number of applications. The primary reasons for the choice of a gasoline two stroke engine includes its low cost, mechanical simplicity and high specific power output. Some applications for the gasoline two stroke engine include small capacity motorcycles and scooters, off road recreational vehicles, hand held power tools and unmanned aerial vehicles. New technologies, which are already mature in four stroke engines, are now being applied to two stroke engines. Such technologies include direct fuel injection, electronic engine management and exhaust gas after treatment. To implement these new technologies computation models are being continuously developed to improve the design process of engines. Multi-dimensional computational fluid dynamics modelling is now commonly applied to engine research and development, it is a powerful tool that can give great insight into the thermofluid working of an engine. Multi-dimensional tools are however computationally expensive and quasi-dimensional modelling methods are often better suited for the analysis of an engine, for example in transient engine simulation. This thesis reports the development of a new quasi-dimensional combustion model for a loop scavenged two stroke engine. The model differs from other quasi-dimensional models available in the literature as it accounts for a bulk motion of the flame front due to the tumble motion created by the loop scavenge process. In this study the tumble motion is modelled as an ellipsoid vortex and the size of the vortex is defined by the combustion chamber height and a limiting elliptical aspect ratio. The limiting aspect ratio has been observed in experimental square piston compression machines and optical engines. The new model also accounts for a wrinkled flame brush thickness and its effects on the interaction between flame front and combustion chamber. The new combustion model has been validated against experimental engine tests in which the flame front propagation was measured using ionization probes. The probes were able determine the flame front shape, the bulk movement of the flame front due to tumble and also the wrinkled flame brush thickness.

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42

Василенко, Олег Вадимович. "Совершенствование рабочего процесса двухтактного двигателя с искровым зажиганием и непосредственным впрыском топлива." Thesis, Украинский государственный университет железнодорожного транспорта, 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21849.

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Диссертация на соискание ученой степени кандидата технических наук по специальности 05.05.03 – двигатели и энергетические установки. Национальный технический университет "Харьковский политехнический институт", Харьков, 2016 г. Диссертация посвящена улучшению эколого-экономических показателей двухтактных ДВС с искровым зажиганием путем применение системы непосредственного впрыска топлива в камеру сгорания. На двигателе ДН-4М проведены экспериментальные исследования с расслоением и обеднением топливновоздушного заряда при непосредственном впрыске топлива. Для обеспечения организации расслоенного топливновоздушного заряда применяется клапанная форсунка с модернизированным распылителем (техническая новизна защищена патентом Украины на изобретение), обеспечивающим кумулятивную топливную струю, направленную на поверхность камеры сгорания возле электродов свечи зажигания. На такте сжатия воздушный поток движется над топливной пленкой, где организуется обогащенная топливновоздушная смесь, которая направляется к электродам свечи зажигания. При этом на режимах холостого хода и на частичных нагрузках на момент подачи искры зажигания на периферии топливновоздушной смеси, возле стенок надпоршневого объема, располагается воздушный заряд с продуктами сгорания. Выявлено, что резервами повышения показателей работы двигателя являются снижение тепловых потерь с отработавшими газами и в систему охлаждения. В двухтактных двигателях с искровым зажиганием при непосредственном впрыскивании топлива и с расслоением топливновоздушного заряда при использовании бензо-этанольных смесей обеспечивается устойчивая работа во всем диапазоне нагрузок без изменений регулировочных параметров с более высокими экономическими и экологическими показателями, чем в аналогичных двигателях с внешним смесеобразованием.
Thesis to obtain scientific degree of Candidate of Engineering sciences on the speciality 05.05.03 – engines and power plants. National Technical University "Kharkiv Polytechnic Institute", Kharkov, 2015. The dissertation is devoted to improving environmental and economic performance two-stroke internal combustion engines with spark ignition by the use of direct fuel injection. Determined that a promising way of internal mixing with direct fuel injection is the organization layered fuel-air charge, providing improved environmental and economic performance. The criterion L, which characterizes the stratification of the fuel-air charge, can qualitatively assess the effect of mixing process on the performance of the engine as a whole. A factor Z, which is deter-mined using indicator efficiency two-stroke engine with external mixture formation, which takes into account only that fuel which is involved in the combustion cylinder engine. The use of direct injection petrol bundle of fuel-air charge modes for loading characteristic at n = 3000 rev/min enabled the reduction in fuel con-sumption of 1.83 times at the effective efficiency rjfmax = 0,31, 7-10 times lower harmful substances (CO, CH) in exhaust gases, the use of gasoline-ethanol blends ensured stable operation of the engine in all load range and a high economic and environmental performance than when using carburetor system power.

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43

Василенко, Олег Вадимович. "Удосконалення робочого процесу двотактного двигуна з іскровим запалюванням і безпосереднім вприскуванням палива." Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21826.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.05.03 – двигуни та енергетичні установки. Національний технічний університет "Харківський політехнічний інститут". – Харків, 2016 р. Дисертація присвячена поліпшенню еколого-економічних показників двотактних ДВЗ з іскровим запалюванням шляхом застосування безпосереднього вприскування палива. Визначено, що перспективним способом внутрішнього сумішоутворення при безпосередньому вприскуванні палива є організація розшарованого паливоповітряного заряду, що забезпечує покращення еколого-економічних показників. Запропоновано критерій L, який характеризує рівень розшарування паливоповітряного заряду, дозволяє якісно оцінити вплив процесів сумішоутворення на показники двигуна в цілому. Запропоновано коефіцієнт Z, за допомогою якого визначається індикаторний ККД двотактного двигуна із зовнішнім сумішоутворенням, який враховує тільки те паливо, яке згоряє в циліндрі ДВЗ. Застосування безпосереднього вприскування бензину з розшаруванням паливоповітряного заряду на режимах навантажувальній характеристиці при n = 3000 хв-1 дозволило зменшити в 1,83 рази витрати палива при значенні ефективного ККД ηе max = 0,31, в 7–10 раз знизити вміст шкідливих речовин (СО, СН) у відпрацьованих газах, також використання бензо-етанольних сумішей забезпечило стійку роботу двигуна у всьому діапазоні навантажень та більш високі економічні і екологічні показники, чим при використанні карбюраторної системи живлення.
Thesis to obtain scientific degree of Candidate of Engineering sciences on the speciality 05.05.03 – engines and power plants. National Technical University "Kharkiv Polytechnic Institute", Kharkov, 2015. The dissertation is devoted to improving environmental and economic performance two-stroke internal combustion engines with spark ignition by the use of direct fuel injection. Determined that a promising way of internal mixing with direct fuel injection is the organization layered fuel-air charge, providing improved environmental and economic performance. The criterion L, which characterizes the stratification of the fuel-air charge, can qualitatively assess the effect of mixing process on the performance of the engine as a whole. A factor Z, which is deter-mined using indicator efficiency two-stroke engine with external mixture formation, which takes into account only that fuel which is involved in the combustion cylinder engine. The use of direct injection petrol bundle of fuel-air charge modes for loading characteristic at n = 3000 rev/min enabled the reduction in fuel con-sumption of 1.83 times at the effective efficiency rjfmax = 0,31, 7-10 times lower harmful substances (CO, CH) in exhaust gases, the use of gasoline-ethanol blends ensured stable operation of the engine in all load range and a high economic and environmental performance than when using carburetor system power.

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44

Zhang, Yan. "Experimental investigation of CAI combustion in a two-stroke poppet valve DI engine." Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/10531.

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Due to their ability to simultaneously reduce fuel consumption and NOx emissions, Controlled Auto Ignition (CAI) and HCCI combustion processes have been extensively researched over the last decade and adopted on prototype gasoline engines. These combustion processes were initially achieved on conventional two-stroke ported gasoline engines, but there have been significantly fewer studies carried out on the CAI combustion in two-stroke engines. This is primarily due to the inherent problems associated with conventional two-stroke engine intake and exhaust ports. Meanwhile, engine downsizing has been actively researched and developed as an effective means to improve the vehicle’s fuel economy. This is achieved by operating the engine at higher load regions of lower fuel consumption and by reducing the number of cylinders. However, aggressive downsizing of the current 4-stroke gasoline engine is limited by the knocking combustion and high peak cylinder pressure. As an alternative approach to engine downsizing, boosted two-stroke operation is being researched. In this thesis, it has been shown that the CAI combustion in the two-stroke cycle could be readily achieved at part-load conditions with significant reductions in CO and uHC emissions when compared to typical SI combustion in a single cylinder gasoline direct injection camless engine. In addition, extensive engine experiments have been performed to determine the optimum boosting for minimum fuel consumption during the two-stroke operation. In order to minimise the air short-circuiting rate, the intake and exhaust valve timings were varied and optimised. It is shown that the lean operation under boosted condition can extend the range of CAI combustion and increase combustion and thermal efficiencies as well as producing much lower CO and HC emissions. By means of the cycle-resolved in-cylinder measurements and heat release analysis, the improvement in combustion and thermal efficiencies were attributed to the improved in-cylinder mixture, optimised autoignition, and combustion phases. Finally, in view of the increased use of ethanol in gasoline engines, E15 and E85 were used and their effect on engine performance, fuel economy and exhaust emissions were investigated.

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Höglund, Filip. "Knock Detection in a Two-Stroke Engine to be Used in the Engine Management System." Thesis, Linköpings universitet, Fordonssystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-104681.

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Engine knock has long been a well recognized phenomenon in the automotive industry. Detecting engine knock opens up the possibility for an indirect feedback of the engine's internal combustion without installing a pressure transducer inside the cylinder. Knock detection has mainly been used for spark advance control, making it possible to control the engine close to its knock limit in search for the optimal ignition timing. This application has to a lesser extent been applied to lightweight two-stroke engines, which is the focus of this study. The investigation features a modern chainsaw engine whose knock characteristics were first determined with a pressure transducer. The structural vibrations originating from the engine knock are filtered out of the signal from a remote located accelerometer. The knock intensity is compared with the signal from the pressure transducer which shows a correlation with an accepted extent between the two sensors. Parameters that affect the knock intensity have also been investigated. These include engine temperature, different types of fuel and ignition timings.

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Russell, Brian Bailie. "Investigation of combustion systems for a two-stroke cycle diesel engine." Thesis, Queen's University Belfast, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317118.

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Hudson, James W. "Development and calibration of a torsional engine model for a three-cylinder, two-stroke diesel engine." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1997. http://handle.dtic.mil/100.2/ADA343145.

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Thesis (M.S. in Mechanical Engineering) Naval Postgraduate School, December 1997.
"December 1997." Thesis advisor(s): Knox T. Millsaps, Jr. Includes bibliographical references (p. 57-58). Also available online.

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Teakle, Philip Robert. "A Numerical Investigation Of A Two-Stroke Poppet-Valved Diesel Engine Concept." Queensland University of Technology, 2004. http://eprints.qut.edu.au/15885/.

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Two-stroke poppet-valved engines may combine the high power density of two - stroke engines and the low emissions of poppet-valved engines. A two-stroke diesel engine can generate the same power as a four-stroke engine of the same size, but at higher (leaner) air/fuel ratios. Diesel combustion at high air/fuel ratios generally means hydrocarbons, soot and carbon monoxide are oxidised more completely to water and carbon dioxide in the cylinder, and the opportunity to increase the rate of exhaust gas recirculation should reduce the formation of nitrogen oxides (NOx). The concept is being explored as a means of economically modifying diesel engines to make them cleaner and/or more powerful. This study details the application of two computational models to this problem. The first model is a relatively simple thermodynamic model created by the author capable of rapidly estimating the behaviour of entire engine systems. It was used to estimate near-optimum engine system parameters at single engine operating points and over a six-mode engine cycle. The second model is a detailed CFD model called KIVA-ERC. It is a hybrid of the KIVA engine modelling package developed at the Los Alamos National Laboratory and combustion and emissions subroutines developed at the University of Wisconsin-Madison Engine Research Center. It was used for detailed scavenging and combustion simulations and to provide estimates of emissions levels. Both models were calibrated and validated for four-stroke cycle operation using experimental data. The thermodynamic model was used to provide initial and boundary conditions to the KIVA-ERC model. Conversely, the combustion simulations were used to adjust zero-dimensional combustion correlations when experimental data was not available. Scavenging simulations were performed with shrouded and unshrouded intake valves. A new two-zone scavenging model was proposed and validated using multidimensional scavenging simulations. A method for predicting the behaviour of the two-stroke engine system based on four-stroke data has been proposed. The results using this method indicate that a four-stroke diesel engine with minor modifications can be converted to a two-stroke cycle and achieve substantially the same fuel efficiency as the original engine. However, emissions levels can not be predicted accurately without experimental data from a physical prototype. It is therefore recommended that such a prototype be constructed, based on design parameters obtained from the numerical models used in this study.

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McNaught, PL. "Low pressure fuel injection of a two-stroke cycle spark ignition engine." Thesis, University of Cape Town, 1986. http://hdl.handle.net/11427/23297.

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Alexander, Mattsson. "Engine stability : A study of the events occurring prior to thecombustion in a small two-stroke engine." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-34225.

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This thesis is a study conducted in collaboration with the engine performance group atHusqvarna AB. The study focuses on engine stability of smaller two stroke handheld enginesrunning on E10 (10% ethanol mixture in gasoline). The reason for the study is the new EUproposition that by 2020 all fuel must have 10 % renewable fuel content. To meet thisproposition Husqvarna has evaluated E10 and found that the engine stability of smaller twostroke engines are affected in a negative way by the fuel.The study focuses on events occurring prior to the combustion and mainly the carburetor. Theobjective for the thesis is to seek what contribution the events occurring prior to thecombustion have to the engine stability and find simple and implantable solution to improvethe stability with regards to the carburetor.The study has been conducted in three different work packages, system understanding to buildknowledge of how the carburetor operates, fault finding to seek potential attributes that canaffect the stability and fault mode analysis to seek why the attributes affect the stability.Furthermore, all the attributes found has been tested and validated on the engine to seek theircontribution to the stability.The conclusion made of the thesis is that with simple and implementable improvements of thecarburetor the engine stability could be increased with 40 %. A total of five differentattributes were found to affect the stability of the engine. Furthermore, a very detailedexplanation of how the carburetor operates and components inside the carburetor has beenestablished during the thesis.

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