摘要
针对空化水射流流场空化云演化采用RANS方法模拟不准确的问题,采用大涡模拟(Large-eddy simulation,LES)对风琴管空化喷嘴流场进行数值模拟。基于Mixture多相流模型和Zwart-Gerber-Belamri(ZGB)空化模型,分别采用SM模型(Smagorinsky-Lilly model,SM)、壁面适应的局部涡黏模型(Wall-adapted local eddy-viscous,WALE)和代数壁面模型(Wall-modeled large eddy simulation,WMLES)3种不同的亚格子模型,对风琴管喷嘴空化水射流流场进行数值模拟,分析空化水射流特性、空化云演化规律及脱落频率。结果表明:WALE模型可以较为准确模拟空化云演化周期,与高速摄像拍摄结果吻合较好;在喷嘴内圆柱段以及扩散段壁面附近产生涡环,加快了空化泡析出,WALE模型较好的模拟了涡环结构;涡量分析表明涡流在喷嘴出口附近出现,射流的末端空化泡破碎产生扰动,大尺度涡演化为小尺度涡,WALE模型模拟出涡的破碎范围较SM模型更大,WMLES模型未捕捉到小尺度涡。
Aiming at the problem of inaccurate simulation of cavitation cloud evolution in cavitating water jet flow field using RANS method,this paper uses large eddy simulation(LES)to numerically simulate the flow field of organ tube cavitation nozzle.Based on mixture multiphase flow model and Zwart-Gerber-Belamri(ZGB)cavitation model,three different types of Smagorinsky-Lilly model(SM),wall-adapted local eddy-viscous model(WALE)and algebraic wall model(WMLES)are used,respectively.The sub-lattice model is used to numerically simulate the flow field of the cavitation water jet from the organ tube nozzle,and analyze the characteristics of the cavitation water jet,the evolution law of the cavitation cloud and the shedding frequency.The results show that the WALE model can more accurately simulate the evolution period of cavitation clouds,which is in good agreement with the high-speed camera results;vortex rings are generated in the inner cylindrical section of the nozzle and near the wall of the diffuser section,which accelerates the precipitation of cavitation bubbles,and the WALE model is better.The vortex ring structure is simulated,the analysis of vorticity shows that the vortex appears near the nozzle outlet,the cavitation bubbles at the end of the jet are broken and disturbed,and the large-scale vortices evolve into small-scale vortices.The WMLES model does not capture smallscale eddies.
作者
王连安
徐艳
王尊策
李森
张井龙
刘海水
WANG Lianan;XU Yan;WANG Zunce;LI Sen;ZHANG Jinglong;LIU Haishui(School of Mechanical Science and Engineering,Northeast Petroleum University,Daqing 163318,Heilongjiang,China)
出处
《机械科学与技术》
CSCD
北大核心
2024年第9期1514-1521,共8页
Mechanical Science and Technology for Aerospace Engineering
基金
黑龙江省自然科学基金项目(QC2016003)。
关键词
大涡模拟
亚格子模型
风琴管喷嘴
空化水射流
large eddy simulation
subgrid-scale model
organ pipe cavitation nozzles
cavitation jet