Mejri-Chtioui, Imène (2006) Analysis of non stationnary cavitating flow through inducers. PhD thesis Mécanique, ENSAM 2006ENAM13.
Abstract
Faced with the problem of design in the pump industry, the main difficulty of manufacturers is to have fast, reliable and accurate methods. So far, inducers have been designed principally on an empirical basis, and we depend on such empirical data for the basic engineering design. However, CFD is becoming a dependable tool to predict steady and even unsteady flow with cavitation. With these CFD new and powerful tools, it is expected that we will be able to obtain explanations for the inducers cavitation instabilities and offer new methodologies for the design of stable and reliable inducers and inducer main-stage performance. This research work involving both theory and experiments, deals with this topic. We have developed a complete procedure for design, performance analysis and optimization of inducers geometry. First of all, three-dimensional calculations are carried out for inducers in steady cavitating and non cavitating conditions. Based on both numerical results and experimental test, a second stage of analysis is achieved into unsteady flow conditions. The observation of partial cavities under various conditions leads to the conclusion that the characteristic size of the region in which unsteady effects are significant is variable. In deed, it depends on the inducers design parameters. In some cases, cavitating flow unsteadiness is confined in a relatively small region, so that the cavity can be considered as stable, at least from a large scale viewpoint. Cavitation is handled using special experimental and numerical methodologies. The three-dimensional flow study is performed by CFD tools from ANSYS-Canada group, with the collaboration of the New Brunswick University. This study was illustrated on one of our inducers and it provides the means to complete and validate the cavitating flow simulation procedure of the CFX5.7 code.
| Item Type: | PhD Thesis (PhD) |
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| Thesis Supervisor: | Bakir, Farid and Rey, Robert |
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| Date: | June 2006 |
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| Board of examiners: | Bois, Gérard and Kueny, Jean-Louis and Santolaria, Carlos and Bakir, Farid and Blum, Hervé and Rey, Robert |
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| Ecole Doctorale: | ED 432 ECOLE DOCTORALE SCIENCES DES METIERS DE L'INGENIEUR |
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| Discipline: | Mécanique |
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| Collection (Fonds): | ENSAM |
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| Institution: | ENSAM |
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| Subjects: | 5. Fluid Mechanics and Energy |
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| Uncontrolled Keywords: | Turomachinery, Inducers design, Inducer, Cavitation, Performance analysis, Experimental and numerical flow analysis, Turbomachines, Conception des inducteurs, Inducteur, Cavitation, Analyse des performances, Analyse expérimentale et numérique des écoulements |
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