喷油器动边界条件下球阀空化效应数值分析  

Numerical Analysis of Cavitation Effect of Ball Valve Under Dynamic Boundary Condition of Injector

作　　者：刘景斌 刘振明[1] 吴杰长[1] 李子铭 Liu Jingbin;Liu Zhenming;Wu Jiechang;Li Ziming(College of Power Engineering,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学动力工程学院,湖北武汉430033

出　　处：《内燃机学报》2022年第1期62-70,共9页Transactions of Csice

基　　金：国家自然科学基金资助项目(51879629).

摘　　要：利用计算流体力学(CFD)软件,基于大涡模拟(LES)模型,对球阀及阀座处的空化效应进行了动边界条件下的数值计算,并分析了不同轨压和不同工作脉宽对空化效应的影响.结果表明:球阀开启时刻,空化初生于球阀与阀座密封环面附近,随后空化迅速增强;球阀开启期间,球阀腔内的空化状态分为剧烈和相对平稳的两个阶段;在轨压为70、115和160 MPa的工况下,第一阶段的持续时间逐渐增长,分别为0.72、1.16和1.42 ms,且腔内整体空化的区域和强度均有所增强;在不同轨压下,阀座面上密封环面及稍下游位置是空化最严重的区域,随轨压的升高该位置的平均蒸气体积分数分别为0.643、0.757和0.777;工作脉宽越短,平均空化程度越高.A large eddy simulation(LES)based model of an injector was established to calculate the cavitation effect under the dynamic boundary conditions,and the influence of different rail pressures and operating pulse widths on the cavitation effect was analyzed.The results show that when the ball valve is opened,the cavitation occurs initially near the sealing annular surface between the ball valve and the valve seat,and then the cavitation rapidly increases.During the opening of the ball valve,the cavitation state in the ball valve chamber is divided into two stages,intense stage and relatively stable stage.With the increase of rail pressure of 70,115 and 160 MPa,the duration of the first stage gradually increases,which is 0.72,1.16 and 1.42 ms respectively,and the overall cavitation area and intensity are both enhanced.In different rail pressure cases,the most serious cavitation area is located in the sealing annulus and its downstream position.The average vapor volume fraction at this position is 0.643,0.757 and 0.777,respectively,with the increase of rail pressure.The shorter the working pulse width,the higher the average degree of cavitation.

关 键 词：喷油器 球阀 空化 计算流体力学 动边界 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]