大功率液力偶合器调速工况瞬态流场特性  

Analysis of transient flow field characteristics of large-scale hydrodynamic coupling under speed regulation

作　　者：卢秀泉 胡春玉 柴亚龙 马文星 张剑楠 LU Xiu-quan;HU Chun-yu;CHAI Ya-long;MA Wen-xing;ZHANG Jian-nan(School of Mechanical and Aerospace Engineering,Jilin University,Changchun 130022,China)

机构地区：[1]吉林大学机械与航空航天工程学院

出　　处：《吉林大学学报（工学版）》2019年第5期1539-1546,共8页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51505175);吉林省科技发展计划优秀青年人才基金项目(20170520107JH);吉林省教育厅“十三五”科学技术项目(JJKH20180136KJ);工信部高端土方机械绿色设计平台建设项目([2017]327)

摘　　要：为研究大功率液力偶合器在动态调速工况下的内部流动机理,通过UDF程序定义动态调速过程,建立了大功率液力偶合器内部瞬态气液两相流场的数值计算方法,获得了动态调速工况下气液两相流体在泵轮和涡轮流道间的动态循环流动变化过程及气液两相分布状态。结果表明:大功率液力偶合器在调速起始阶段由于滑差较小,同时循环流量在无叶栅区域高能流体的屏蔽作用下,会引起泵轮力矩系数显著降低;随着转速比降低,湍动能逐渐增大,且泵轮流道内湍流脉动强度要明显大于涡轮,在泵轮入口处出现极值,此现象在制动工况尤为明显。通过PIV试验验证,数值模拟结果与试验结果吻合较好,为优化大功率液力偶合器动态调速工况瞬态性能提供了必要的理论基础。In order to study the mechanism of internal flow of large-scale hydrodynamic coupling under dynamic speed regulation,the dynamic speed regulation process is defined by UDF program in this paper,and a numerical method for calculating the transient gas-liquid two phase flow with a large-scale hydrodynamic coupling is established. The dynamic circulation flow of gas-liquid two phase fluid between the pump and the turbine wheel is produced,and the gas-liquid two phase distribution state is obtained.The results show that with a smaller slip ratio at the initial stage of speed regulation with the shielding effect of high energy fluid in the vane free region,the torque coefficient is significantly reduced. With the decrease in speed ratio,the turbulent kinetic energy increases gradually,and the turbulent intensity of the pump impeller is much larger than that of the turbine. In the inlet of the pump wheel,the turbulent kinetic energy has an extreme value,and the phenomenon is especially evident in the braking condition. The PIV test shows that the numerical simulation results are in good agreement with the test. The work of this paper provides the necessary theoretical basis for optimizing the transient performance under the dynamic speed regulation mode of the large-scale hydrodynamic coupling.

关 键 词：流体传动与控制 瞬态流场 气液两相流动 混合雷诺平均/大涡模拟 用户定义函数 

分 类 号：TH137[机械工程—机械制造及自动化]