Large eddy simulation of the transient cavitating vortical flow in a jet pump with special emphasis on the unstable limited operation stage
作者机构：Hubei Key Laboratory of Waterjet Theory and New TechnologySchool of Power and Mechanical EngineeringWuhan UniversityWuhan430072China Key Laboratory of Transients in Hydraulic MachineryMinistry of EducationWuhan UniversityWuhan430072China State Key Laboratory of Water Resources and Hydropower Engineering ScienceWuhan UniversityWuhan430072China
出 版 物：《Journal of Hydrodynamics》 (水动力学研究与进展B辑（英文版）)
年 卷 期：2020年第32卷第2期
页 面：345-360页
核心收录：
学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0701[理学-数学] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 0812[工学-计算机科学与技术（可授工学、理学学位）]
基 金：Project supported by the National Natural Science Foundation of China(Grant Nos.51679169 11472197)
主 题：Cavitation jet pump large eddy simulation vortex structure vorticity transport equation
摘 要：This paper studies the unsteady three-dimensional cavitating turbulent flow in a jet ***,thefocus is on the unstable limited operation stage,and both the computational and experimental methods are *** the experiments,the distribution of the wall pressure,as well as the evolution of cavitation over time,are obtained for a jet *** is carried out using the large eddy simulation,combined with a mass transfer cavitation *** numerical results are compared with the experimental results,including the fundamental performances(the pressure ratio h and the efficiencyη),as well as the wall pressure *** the experimental and computational results indicate that the evolution of the cavitation over time in a jet pump is a quasi-periodic process during the unstable limited operation *** annular vortex cavitation inception,development and collapse predicted by the large eddy simulation agree fairly well with the experimental ***,the relationship between the cavitation and the vortex structure is discussed based on the numerical results,and it is shown that the development of the vortex structures in the jet pump is closely related to the evolution of the *** cavitation-vortex interaction is thoroughly analyzed based on the vorticity transport *** analysis reveals that the cavitation in a jet pump dramatically influences the distribution and the production of the *** process of the annular cavitation inception,development,and collapse involves a significant increase of the vorticity.
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