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Dissertations / Theses on the topic 'Vanes diffuser'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Young, Kim F. "The performance of compressor outlet guide vanes and downstream diffuser." Thesis, Loughborough University, 1988. https://dspace.lboro.ac.uk/2134/13622.

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A large-scale compressor/diffuser test rig has been designed and constructed which,. together with an automated data acquisition system, permits more detailed and more accurate measurements than were previously possible - especially in the region of the compressor OGV's. Results are presented based on experiments carried out using two different single-stage axial-flow compressors operating immediately upstream of a straight-core annular diffuser, each compressor being tested with a conventional stator row and a double-dihedral chevron type of stator row i.e. four main configurations were inves

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2

Ольштынский, П. Л. "Учет особенностей рабочего процесса направляющего аппарата для повышения технического уровня центробежного насоса". Thesis, Сумский государственный университет, 2016. http://essuir.sumdu.edu.ua/handle/123456789/46026.

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У дисертаційній роботі запропоновано ефективний спосіб підвищення технічного рівня відцентрового насоса за рахунок застосування ступеня з мінімальним діаметральним відносним габаритом, що досягається шляхом використання напрямного апарата з переривчастою перевідною зоною. Основним змістом роботи є дослідження структури течії в елементах напрямного апарата, а також впливу геометричних елементів, що утворюють перевідну зону, на структуру потоку в перевідній зоні та зворотних каналах і на гідравлічні втрати. Дослідження впливу геометричних елементів, що утворюють перевідну зону, на структуру пото

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3

Lancel, Jerome. "Analysis and test of a centrifugal compressor." Thesis, University of Sussex, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250183.

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4

He, Ning. "Impeller diffuser interactions in high speed centrifugal compressors." Thesis, Cranfield University, 2001. http://dspace.lib.cranfield.ac.uk/handle/1826/11403.

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In the current research work, a computational analysis of a high-speed centrifugal compressor stage for turbocharger applications is presented. A detailed investigation about the interactions between backswept impeller and downstream vaneless and vaned diffusers is carried out. ' A unshrouded backswept impeller with splitters was combined with a vaneless diffuser or a number of different designs of vaned diffusers. The CFD solver CFX-TASCow was used. The three-dimensional Reynolds- Averaged Navier-Stokes equations are solved and a pressure correction method is employed to solve the system of e

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5

Pinarbasi, Ali. "Flow investigation in centrifugal compressor vaneless and vaned diffusers." Thesis, University of Liverpool, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284261.

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6

Bitter, Jamin J. "One-Dimensional Performance Modeling of Centrifugal Flow Vaned Diffusers." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1711.pdf.

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7

Cherdieu, Patrick. "Contrôle du décollement dans un diffuseur aubé de turbomachine centrifuge." Thesis, Ecole centrale de Lille, 2013. http://www.theses.fr/2013ECLI0020/document.

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L'amélioration de la performance des turbomachines fonctionnant loin de leur point d'adaptation passe par la maîtrise des phénomènes instationnaires qui se produisent dans ces différents organes. L'étude présentée ici se concentre sur les interactions entre une roue de ventilateur centrifuge et son diffuseur. Elle vise, par des mesures de pression sur les différentes parois du diffuseur, ainsi que par des sondages dans les canaux inter-aubages à analyser finement ces phénomènes instationnaires et notamment les décollements fluctuants apparaissant sur les aubes à sur débit, et à mesurer leur in

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8

Akseraylian, Dikran. "A computational study of the 3D flow and performance of a vaned radial diffuser." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-11182008-063206/.

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9

Phillips, Michael Stephen. "A computational investigation of the effects of inlet flow conditions on vaned diffuser performance." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/50299.

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10

Eynon, P. A. "Application of low solidity vaned diffusers for broad operating range turbocharger compressors." Thesis, University of Bath, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337823.

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11

Georgakis, Christos. "Experimental studies on volute-impeller interactions of centrifugal compressors having vaned diffusers." Thesis, Cranfield University, 2003. http://dspace.lib.cranfield.ac.uk/handle/1826/10764.

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It is well recognised that the volute plays a important role on the stage performance of a turbo machine in terms of pressure recovery, losses, efficiency and flow range, in addition to influencing stability and radial loads. Although there is a demand for further improvements in efficiency and operating range of compressor components, less attention has been paid to the effect of volute design. The goal of the present study was to experimentally measure the flow through a high pressure ratio 5:1 centrifugal compressor incorporating a vaned diffuser and a volute as part of a fully representati

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12

Georgakis, C. "Experimental studies on volute-impeller interactions pf centrifugal compressors having vaned diffusers." Thesis, Cranfield University, 2003. http://dspace.lib.cranfield.ac.uk/handle/1826/10764.

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It is well recognised that the volute plays a important role on the stage performance of a turbo machine in terms of pressure recovery, losses, efficiency and flow range, in addition to influencing stability and radial loads. Although there is a demand for further improvements in efficiency and operating range of compressor components, less attention has been paid to the effect of volute design. The goal of the present study was to experimentally measure the flow through a high pressure ratio 5:1 centrifugal compressor incorporating a vaned diffuser and a volute as part of a fully representati

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13

Yang, Jun. "Flow Patterns Causing Saddle Instability in the Performance Curve of a Centrifugal Pump with Vaned Diffuser." Doctoral thesis, Università degli studi di Padova, 2015. http://hdl.handle.net/11577/3424176.

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In the present study, a reduced scale model of a low-pressure stage of a two-stage pump turbine was investigated when it operates in pump mode, which is as a centrifugal pump with vaned diffuser. An instability region was found in its Q-H curve. This instability region, centered into the flow rate interval between 0.45 to 0.7 QDes, restricts the stable operating range of the test pump. The object of this study was to analyze the origins and development of the unsteadiness inner pump during this saddle instability region, and to find the causes of this saddle, which could guide the design, an

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14

Everitt, Jonathan (Jonathan Neil). "The role of impeller outflow conditions on the performance and stability of airfoil vaned radial diffusers." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/90608.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2014.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 277-285).<br>This thesis quantifies the relative importance of the impeller outflow angle, Mach number, non-uniformity and unsteadiness on diffuser performance, through diffuser experiments in a compressor stage and in a swirling flow test

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15

Bénichou, Emmanuel. "Analyse numérique des instabilités aérodynamiques dans un compresseur centrifuge de nouvelle génération." Thesis, Ecully, Ecole centrale de Lyon, 2015. http://www.theses.fr/2015ECDL0046.

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L’étude effectuée au cours de cette thèse a permis de caractériser numériquement les instabilités d’origine aérodynamique rencontrées dans un compresseur centrifuge dessiné par Turbomeca. Ce compresseur est composé d’une roue directrice d’entrée, d’un rouet centrifuge, d’un diffuseur radial et de redresseurs axiaux. Le module expérimental, dénommé Turbocel, sera accueilli au LMFA courant 2016. Le contenu de cette étude repose donc exclusivement sur des résultats numériques dont certains sont cependant comparés à des résultats expérimentaux partiels obtenus par Turbomeca sur une configuration p

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16

Portier, Eric. "Etude de l'écoulement au travers de diffuseurs équipés de vannes de guidage ; analyse des performances et application au contrôle actif des débits pulsés." Poitiers, 2000. http://www.theses.fr/2000POIT2269.

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Ce travail contribue a la mise en uvre d'un dispositif de controle actif de debits pulses etant a l'origine de bruits en basses frequences. L'application des equations de la mecanique des fluides aux ecoulements instationnaires en conduite mene en effet a une relation entre les fluctuations de debit et une perte de charge dont l'evolution instantanee peut conduire a l'annulation des fluctuations periodiques. L'objet de cette etude est alors de comprendre et maitriser l'organisation d'un ecoulement traversant une singularite et faire le lien avec la perte de charge. Ce travail, essentiellement

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17

Gongol, Jakub. "Návrh malého proudového motoru do 1kN tahu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230963.

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This work will be focused on issue of a jet engine. The thesis will be divided into search retrieval part and computational part. In the search retrieval part it will focus on different configurations of jet engines as well as areas of their use. The main part of the thesis will however focus on a calculations where a turbine, compressor and an exhaust nozzle will be designed in order to give a thrust of approximately 1kN. Next step will be determination of an engine charcteristic that will give us a preview on how the engine performance will look like in off-design modes.

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18

Jaiswal, Mayank. "Vaned Diffuser Effect on Centrifugal Compressor Performance and Stall." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5940.

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A centrifugal compressor is a mechanical device that helps to achieve higher pressure ratios at lower mass flow rates. It is used in many applications such as turbochargers, cruise missiles, and turbojet engines where compact high pressure ratio compressors are required. The performance of a centrifugal compressor is greatly influenced by instabilities like stall and surge, which decrease the operating range and the efficiency of a compressor. These instabilities are effected by the geometry of the vaned diffuser used and hence, the present study aims to see both computationally and experiment

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19

Utgikar, Purushottam Shrikrishan. "Investigations on vaned radial diffusers with diverging walls." Thesis, 1985. http://localhost:8080/iit/handle/2074/4895.

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20

Lin, Gu-chiuan, and 林谷泉. "Performance of vaned diffuser micropumps actuated by oscillating pressure gradient." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/2yc9dj.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>95<br>Abstract In this study, the performance of vaned microdiffuser pumps under sinusoidal pressure actuation is explored. Both numerical simulation and experiments are investigated for comparison. In numerical simulation, the outer half-angle θ varies from 9° to 45°, the inner half-angle φ varies from 0° to 45°, and the excitation frequency f varies from 1 Hz to 2000 Hz. The pressure amplitude P0 is fixed at 200 Pa. The numerical results show that net flow rate is in the diffuser direction for all vaned diffuser micropumps. Best flow rectification is achieved at

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21

luo, Kai-wei, and 羅凱韋. "A numerical investigation of the slip phenomena in impellers and vaned diffuser of centrifugal compressors." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/22764884776528501553.

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碩士<br>國立勤益科技大學<br>冷凍空調系<br>97<br>This study numerically investigates the slip phenomena of impellers and vaned diffusers of centrifugal compressors. The working fluids include air (as an ideal gas) and R-134a refrigerant (as a real gas). The geometries of impellers are constructed by design software. Eight blade shapes included different blade angle distributions, different specific speeds and different outlet blade angles are designed. The slip onset position, deviation angle and slip factor are investigated for different blades in different flow rate. The governing equations include compress

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22

Thankappan, K. V. "Investigation of swirling compressible flow through wedge vaned radial diffusers for centrifugal compressors." Thesis, 1990. http://localhost:8080/iit/handle/2074/4975.

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23

Shih, Po-Wei, and 施博偉. "Study on Power Consumption of Centrifugal Chiller Caused by Variation of Inlet Guide Vane and Diffuser." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/g6q9v6.

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碩士<br>國立臺北科技大學<br>能源與冷凍空調工程系碩士班<br>105<br>Ever since a long time Building energy saving issues have been discussed. Electricity consumption comparison in the building equipment, the largest HVAC system power consumption. In HVAC system, chiller has been largely applied in office buildings, schools, hospitals and industrial system for cooling. This thesis that variation of inlet guide vane and diffuser open percentage on power consumption of chiller. The building is under study in Taipei city. Variation of inlet guide vane and diffuser opening percentage in different cooling water inlet tempera

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24

CAVAZZINI, GIOVANNA. "Experimental and Numerical Investigation of the Rotor-Stator Interaction in Radial Turbomachines." Doctoral thesis, 2006. http://hdl.handle.net/11577/185358.

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L'analisi dell'interazione rotore-statore è un aspetto di fondamentale importanza nell'ambito delle turbomacchine dal momento che una migliore e più approfondita conoscenza dei fenomeni correlati a tale interazione consente di ottimizzare le prestazioni della macchina. L'interazione rotore-statore si manifesta con una variazione del campo di moto all'interno dei due componenti e determina una differenziazione delle loro prestazioni rispetto alla configurazione isolata. La macchina risulta influenzata sia in termini di curva caratteristica sia in termini di fluttuazioni di pressione al suo inte

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25

Mosberg, Noah Avram. "Experimental investigation of the performance of a fully cooled gas turbine vane with and without mainstream flow and experimental analysis supporting the redesign of a wind tunnel test section." Thesis, 2013. http://hdl.handle.net/2152/28499.

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This study focused on experimentally determining the cooling performance of a fully cooled, scaled-up model of a C3X turbine vane. The primary objective was to determine the differences in overall effectiveness in the presence and absence of a hot mainstream flowing over the vane. Overall effectiveness was measured using a thermally scaled matched Biot number vane with an impingement plate providing the internal cooling. This is the first study focused on investigating the effect of removing the mainstream flow and comparing the contour and laterally-averaged effectiveness data in support

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