Risk assessment of erosive aggressiveness due to the condensation shock by numerical simulation  

作　　者：Wei Zhang Bing Zhu 

机构地区：[1]Science and Technology on Water Jet Propulsion Laboratory,Marine Design and Research Institute of China,Shanghai,200011,China [2]School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai,200093,China

出　　处：《Journal of Hydrodynamics》2022年第2期200-206,共7页水动力学研究与进展B辑（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.91852106).

摘　　要：Cavitation is,for the engineering areas such as fluid machinery and ship propulsion,a known source of erosion.The erosion damage due to cavitation bubble collapse can lead to extreme failure events,implying the replacement of a ship propeller or a turbine in a hydropower plant,all of which are very costly operations.The dynamics of cavitation hydraulic structure is of great importance for cavitation erosion.As a result,the blade surface endures some extremely high stresses,which lead to the cause of wear.Two major mechanisms,re-entrant jet as well as condensation shock,are known to such transient cavitating flow.In the present work we study the latter since less has been reported for the erosion caused by such an unsteady cavitating flow.We adopted an energy transportation equation based method,combined with a collapse event detection strategy,to carry out numerical erosion risk assessment for erosive aggressiveness due to the condensation shock.Comparing with the paint test,our result shows good agreement in the erosive pattern.We further discussed the hydrodynamics of the related flow structures.

关 键 词：Condensation shock numerical simulation cavitation erosion 

分 类 号：O35[理学—流体力学]