转柱泵瞬时流量的理论推导及数值模拟  

Theoretical derivation and numerical simulation of instantaneous flow rate for pillar pump

作　　者：孔繁余[1] 何玉洋[1] 邵飞[2] 张慧[1] 

机构地区：[1]江苏大学流体机械工程技术研究中心,江苏镇江212013 [2]北京航天航空大学能源与动力工程学院,北京100000

出　　处：《江苏大学学报（自然科学版）》2014年第1期29-33,共5页Journal of Jiangsu University：Natural Science Edition

基　　金：国家科技支撑计划项目(2013BAK06B02);江苏省科技支撑计划项目(BE2012147);江苏省研究生科研创新计划项目(CXXZZ12_0680)

摘　　要：为研究转柱泵瞬时流量变化规律的影响因素,设计转柱泵的计算模型.按照其结构与工作原理,从理论上推导出瞬时流量的计算公式,采用动网格技术和编译自定义函数,并结合k-ε湍流模型,对转柱泵内部流场进行非定常数值模拟.结果表明:转柱泵瞬时流量理论计算的推导结果与数值模拟结果基本吻合,转柱泵的瞬时流量呈周期性脉动;泵进出口配流位置角度极为重要,若出口位置滞后,则产生闭死容积,液压腔内盘内压力迅速升高,并产生压力自由震荡,导致在数值模拟中瞬时流量每个周期会出现一段周期性、无规律的上下波动;除了外部尺寸参数以外,配流盘转角设置是转柱泵瞬时流量重要的影响因素.In order to investigate the characteristic of instantaneous flow rate of pillar pump, the calcula ting model was proposed to deduce the formulation of instantaneous flow rate. Based on shear stress trans port turbulent （ k -ε） model, the numerical simulation of the transient flow field of pillar pump was per formed by dynamic mesh method and user defined function. The results show that the pulsation is perio dic in the instantaneous flow rate of pillar pump, and the theoretical derivation is consistent with the nu merical simulation with a period irregular vibration in every cycle in the numerical simulation. For the hysteresis of outlet position, a closed volume is generated with rapid increasing of pressure. The vibration of the pressure is generated by the abrupt increasing of pressure in valve plate. Beside the parameters of the pump, the corner of port plate is an important influencing factor on the instantaneous flow rate of pillar pump.

关 键 词：转柱泵 瞬时流量 理论推导 k—ε湍流模型 数值模拟 

分 类 号：TH324[机械工程—机械制造及自动化]