双流道污水泵内非定常压力脉动特性研究  

Unsteady characteristics of pressure pulsation in a double channel sewage pump

作　　者：谈明高[1] 丁荣[1] 刘厚林[1] 吴贤芳[2] 董亮[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]江苏大学能源与动力工程学院,江苏镇江212013

出　　处：《振动与冲击》2016年第14期155-162,221,共9页Journal of Vibration and Shock

基　　金：国家科技支撑计划(2013BAF01B02);江苏高校优势学科建设工程资助项目(PAPD);过程装备与控制工程四川省高校重点实验室开放基金资助项目(GK201403);江苏大学研究生创新工程项目(KYXX_0039)

摘　　要：基于拓展的标准k-ε湍流模型和Mixture多相流模型,对双流道污水泵内非定常压力脉动进行了数值模拟,计算结果与试验结果较为吻合,数值计算模型和方法可靠性高。在泵蜗壳内设置了监测点来分析不同颗粒粒径和颗粒体积分数时压力脉动的变化。结果表明:颗粒物性对泵内压力脉动影响明显,加入粒径0.5 mm、体积分数5%的颗粒后蜗壳周向压力脉动强度有减弱的趋势且最大减小了34.80%。隔舌下端与蜗壳出口成15°夹角的TP1点因受隔舌处回流影响主频大多不是叶频,而正对隔舌的TP2点和隔舌上端第9断面的TP3点压力脉动主频均为叶频。颗粒在TP3点处发生沉降离析导致静压波动异常,颗粒体积分数一定时选择合适的粒径或粒径一定时适当增大两相流输送浓度都能有效降低压力脉动强度。The unsteady pressure pulsation in a double channel sewage pump was numerically simulated by using the combination of an extended standard k-ε turbulence model and the mixture multiphase flow model. The simulation results are in agreement with the experimental ones,which indicates that the numerical model and the calculation methods are feasible and can be used to predict the pressure pulsation in the double channel sewage pump. The changes of pressure fluctuation under different particle diameters and particle volume fractions were analyzed by setting some monitoring points in the volute. The simulation results show that the pressure pulsation inside the pump changes obviously with the variation of particle properties,and the pressure fluctuation intensity at the volute circumference generally gets weaker with the addition of certain amount of particles and can decrease maximally by 34. 80%. The pressure pulsations at the points TP1 ~ TP3 near the tongue are sensitive to particle properties. The TP1 is located at the lower end of the tongue and the angle between the volute outlet and the TP1 is 15 degrees,the TP2 is located at the tongue intermediate position and the TP3 is located at the ninth section of volute near the tongue. The dominant frequency of pressure pulsation at TP1 usually comes from the tongue backflow,while the dominant frequency at TP2 and TP3 is the blade passing frequency. Due to the tongue,the particles around TP3 accumulate easily,which results in an unusual fluctuation of static pressure. Selecting an appropriate particle size or particle volume fraction can contribute to weaken the pressure fluctuation intensity at TP3.

关 键 词：双流道污水泵 压力脉动 颗粒物性 回流 叶频 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3