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Etude expérimentale du fonctionnment cavitant d'une pompe lors de séquences de démarrage rapide

Abstract : Abstacct : The start-up of rocket engine turbopumps is generally performed in a few seconds only. It implies that these pumps reach their nominal operating conditions after only a few rotations. During these first rotations of the blades, the flow evolution in the pump is governed by transient phenomena, based mainly on the flow rate and rotation speed evolution. The pump transient behavior induces significant pressure fluctuations which may result in partial flow vaporization, i.e. cavitation. The present study focuses on cavitation induced during the pump start-up with two objectives : i) to analyze the cavitating behavior of the pump during fast start-up, ii) to take into account the cavitation phenomena in the prediction of pump behavior during fast start-up. An existing experimental test rig has been updated in the LML laboratory (Lille, France) for the start-ups of a centrifugal pump. Instantaneous measurements of torque, flow rate, inlet and outlet unsteady pressures, and pump rotation velocity enable to characterize the pump behavior during rapid starting periods. Visualizations with high speed camera are also included in the experimental device. A functional model devoted to the prediction of the pump behavior during fast start-up in non cavitating conditions has been developed previously in the LML laboratory, and it has been modified in the present study by taking into account the stationary head drop due to cavitation. The calibration of the transient terms in cavitating conditions requires the determination of the local density within the impeller. For that purpose, X-rays measurements have been performed during fast starts-up with the collaboration of CEA (French nuclear agency). These results will enable to optimize the prediction.
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Submitted on : Monday, March 23, 2009 - 8:00:00 AM
Last modification on : Saturday, December 18, 2021 - 3:28:02 AM
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  • HAL Id : pastel-00004519, version 1



Sébastien Duplaa. Etude expérimentale du fonctionnment cavitant d'une pompe lors de séquences de démarrage rapide. Sciences de l'ingénieur [physics]. Arts et Métiers ParisTech, 2008. Français. ⟨NNT : 2008ENAM0040⟩. ⟨pastel-00004519⟩



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