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

作     者：Wei Zhang Bing Zhu 

作者机构：Science and Technology on Water Jet Propulsion LaboratoryMarine Design and Research Institute of ChinaShanghai200011China School of Energy and Power EngineeringUniversity of Shanghai for Science and TechnologyShanghai200093China 

出 版 物：《Journal of Hydrodynamics》 (水动力学研究与进展B辑（英文版）)

年 卷 期：2022年第34卷第2期

页      面：200-206页

核心收录：

学科分类：08[工学] 080103[工学-流体力学] 0707[理学-海洋科学] 0837[工学-安全科学与工程] 0824[工学-船舶与海洋工程] 0801[工学-力学（可授工学、理学学位）] 

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

主　　题：Condensation shock numerical simulation cavitation erosion 

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.