文丘里喷嘴空化流大涡模拟亚格子模型对比研究  

Comparative Study on Sub-grid Scale Models of Large Eddy Simulation for Venturi Nozzle Cavitating Flows

作　　者：张楚谦 郑平[2] 陈勇刚[1,3] 赵梁 ZHANG Chu-qian;ZHENG Ping;CHEN Yong-gang;ZHAO Liang(College of Civil Aviation Safety Engineering,Civil Aviation Flight University of China,Guanghan 618307,China;College of Petroleum Engineering,Liaoning Shihua University,Fushun 113001,China;Sichuan Key Laboratory of Civil Aircraft Fire Science and Safety Engineering,Civil Aviation Flight University of China,Guanghan 618307,China)

机构地区：[1]中国民航飞行学院民航安全工程学院,四川广汉618307 [2]辽宁石油化工大学石油天然气工程学院,辽宁抚顺113001 [3]中国民航飞行学院民机火灾科学与安全工程四川省重点实验室,四川广汉618307

出　　处：《液压气动与密封》2024年第5期32-38,共7页Hydraulics Pneumatics & Seals

基　　金：辽宁省教育厅科学研究一般项目(L2016017);辽宁省自然科学基金(20170540591);中国民用航空飞行学院科研基金面上项目(J2021-106,J2020-108)。

摘　　要：针对文丘里喷嘴不同机制下可压缩空化流开展了大涡模拟(LES)研究,并对比讨论了3种常用的亚格子模型的适用性。结果显示,各模型在预测回射流机制和凝结激波机制的流速与空化云脱落周期上表现良好。在空化云演化过程中,WALE模型在两种机制下的模拟吻合度最佳,SL模型预测溃灭过程提前,蒸汽相体积分数偏小;KET模型吻合度最差,溃灭过程以及周期内脱落存在时间延迟。初步发现回射流机制下的喉部压力功率谱密度分析服从-5/3标度律,凝结激波机制服从-7/3标度律。LES simulation of compressible cavitating flow in a Venturi nozzle under different mechanisms was conducted in this paper,in which the applicability of three commonly used sublattice models,were compared and discussed.Compared to previous experimental results,it is found that the models have good performance in predicting the flow rate of the re-entrant jet mechanism and the condensation shock mechanism and the shedding period of the cavitation cloud.For the cavitation cloud evolution process,WALE model has the best simulation agreement under the two mechanisms,SL model predicts the collapse process in advance,and the vapor phase volume fraction is small.KET model has the worst fit,and there is a time delay in the collapse process and in-cycle shedding.It is found that the throat pressure power spectrum density analysis under the re-entrant jet mechanism follows the-5/3 scale law,and the condensation shock mechanism follows the-7/3 scale law.

关 键 词：大涡模拟 亚格子模型 空化 空化流 数值模拟 

分 类 号：TH137[机械工程—机械制造及自动化] TE832[石油与天然气工程—油气储运工程]