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Analysis of non stationnary cavitating flow through inducers

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.
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Submitted on : Thursday, October 5, 2006 - 8:00:00 AM
Last modification on : Thursday, October 5, 2006 - 8:00:00 AM
Long-term archiving on: : Thursday, September 30, 2010 - 7:50:52 PM


  • HAL Id : pastel-00001944, version 1



Imène Mejri-Chtioui. Analysis of non stationnary cavitating flow through inducers. Engineering Sciences [physics]. Arts et Métiers ParisTech, 2006. English. ⟨NNT : 2006ENAM13⟩. ⟨pastel-00001944⟩



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