摘要
针对液环泵叶轮轴向叶顶间隙泄漏问题,提出采用介质阻挡放电等离子体激励对液环泵轴向间隙气相泄漏流动进行控制,耦合唯象学模型、RNG k-ε湍流模型及VOF气液两相流模型模拟不同激励电压下等离子体对泄漏流场的干扰作用,探究等离子体激励对间隙泄漏流场的调控机理。结果表明,等离子体激励诱导的壁面射流方向与间隙泄漏流动方向相反,诱导的反向壁面射流能够有效地抑制泄漏流强度,并在一定程度上改善间隙泄漏流引起的二次流动,降低间隙泄漏流动损失;同时在等离子体激励的非间隙区域,等离子体激励诱导产生旋涡结构,使得近壁区域产生额外的水力损失。激励电压及位置对泄漏流控制效果有重要的影响,15 kV激励电压的等离子体流动控制效果明显优于10 kV激励电压,当激励位置位于叶顶间隙出口附近时等离子体激励对泄漏流具有较好的抑制效果。研究结果能够为液环泵的性能优化提供理论参考。
Aiming at the leakage problem of axial tip clearance of the liquid ring pump impeller,dielectric barrier discharge plasma excitation was proposed to control the gas phase leakage flow in the axial clearance of the liquid ring pump.The interference of plasma on leakage flow field under different excitation voltages was simulated by coupling phenomenological model,RNG k-εturbulence model and VOF gas-liquid two-phase model.The control mechanism of plasma excitation on clearance leakage flow field was investigated.The results show that the direction of the wall jet induced by plasma excitation was opposite to that of the clearance leakage flow.The reverse wall jet can effectively suppress the leakage flow intensity,improve the secondary flow caused by the clearance leakage flow to a certain extent,and reduce the clearance leakage flow loss.Meanwhile,the vortex structure was induced by plasma excitation in the non-clearance near-wall region,which caused additional hydraulic loss.The excitation voltage and position had an important influence on the control effect of leakage flow.The plasma flows control effect of 15 kV excitation voltage was significantly better than that of 10 kV excitation voltage.When the excitation position was near the outlet of blade tip clearance,the plasma excitation had a good suppression effect on the leakage flow.The research results can provide a theoretical reference for the performance optimization of liquid ring pumps.
作者
郭广强
王静宜
张人会
陈学炳
杨军虎
GUO Guangqiang;WANG Jingyi;ZHANG Renhui;CHEN Xuebing;YANG Junhu(School of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Key Laboratory of Fluid Machinery and Systems of Gansu Province,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2022年第9期160-167,共8页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金项目(51979135)
甘肃省自然科学基金项目(21JR7RA220)
中国博士后科学基金项目(2022MD713759)
关键词
液环泵
气液两相流
间隙泄漏流动
等离子体激励
流动控制
liquid ring pump
gas-liquid two phase flow
clearance leakage flow
plasma excitation
flow control
