双流道污水泵内非定常压力脉动特性研究

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (14) : 155-162.

论文

双流道污水泵内非定常压力脉动特性研究

谈明高1，丁荣1，刘厚林1，吴贤芳2，董亮1

作者信息 +

Research on the unsteady characteristics of pressure pulsation in a double channel sewage pump

TAN Ming-gao1, DING Rong1, LIU Hou-lin1, WU Xian-fang2, DONG Liang1

Author information +

文章历史 +

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0.5mm、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。

Abstract

The unsteady pressure pulsation in a double channel sewage pump was numerically simulated by using combination of the developed standard k-ε turbulence model and the Mixture multiphase flow model. The simulation results were in agreement with the experimental ones, which indicated that the numerical model and the calculation methods are feasible and can be used to predict the pressure pulsation in a double channel sewage pump. The changes of pressure fluctuation under different particle diameter and particle volume fraction 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, the pressure fluctuation intensity of volute circumference generally gets weaker with the addition of certain amount of particles and the maximum decreases by 34.80%. The pressure pulsation of TP1~TP3 near the tongue is sensitive to particle properties.TP1 is located at the lower end of the tongue and the angle between the volute outlet and TP1 is 15 degrees, TP2 is located at the tongue intermediate position and TP3 is located at ninth section of volute near the tongue. The dominant frequency of pressure pulsation at TP1 usually is not the blade passing frequency because of the influence from the tongue backflow, while the dominant frequency at TP2 and TP3 is the blade passing frequency. Due to tongue, the particles around TP3 accumulate easily, which results in unusual fluctuation of static pressure. Selecting the appropriate particle size or particle volume fraction can contribute to weaken the pressure fluctuation intensity in TP3.

导出引用

谈明高1，丁荣1，刘厚林1，吴贤芳2，董亮1. 双流道污水泵内非定常压力脉动特性研究[J]. 振动与冲击, 2016, 35(14): 155-162

TAN Ming-gao1, DING Rong1, LIU Hou-lin1, WU Xian-fang2, DONG Liang1 . Research on the unsteady characteristics of pressure pulsation in a double channel sewage pump[J]. Journal of Vibration and Shock, 2016, 35(14): 155-162

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