立式轴流泵装置叶片区压力脉动数值分析
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摘要
压力脉动是影响轴流泵装置安全稳定运行的重要因素之一,为明确轴流泵装置叶片区压力脉动的变化规律,基于CFD软件对立式轴流泵装置全流道进行三维非定常数值计算,获得了轴流泵装置叶轮和导叶体区域的压力脉动时域数据,分析了最优工况时各监测点压力脉动特性,以及3个特征监测点的压力脉动随流量的变化规律。结果表明:最优工况时,叶轮进口压力脉动幅值从轮缘到轮毂逐渐减小;叶轮出口压力脉动幅值从轮缘到轮毂先减小后增大;导叶体出口处的压力脉动幅值从轮缘到轮毂先增大后减小。叶轮进口轮缘处压力脉动幅值随流量增大而减小;叶轮出口轮缘处压力脉动幅值随流量增大先减小后增大;导叶体出口轮缘处压力脉动幅值随流量增大而减小。小流量工况时各监测点的压力脉动主频幅值均大于最优工况和大流量工况。计算结果为分析轴流泵安全稳定运行提供了参考。
The pressure fluctuation is one of the important factors affecting the safe and stable operation of axial-flow pumping system,in order to understand the change rules of pressure fluctuation of the blade region in axial flow pumping system,a threedimensional unsteady numerical simulation was carried out using CFD on the whole flow passage of the vertical axial-flow pumping system. The pressure fluctuation time-domain data of impeller and guide vanes of the axial-flow pumping system were obtained,the pressure pulsation characteristics of each monitoring point during the optimal operating conditions were analyzed,and change rules of pressure fluctuation with flow rate at three characteristic monitoring points were analyzed. The results show that under the optimal operating conditions,the pressure fluctuation amplitude at the inlet of the impeller gradually decreased from the rim to the hub;the pressure fluctuation amplitude at the outlet of the impeller first decreased and then increased from the rim to the hub;the pressure fluctuation amplitude at the outlet of the guide vane first increased and then decreased from the rim to the hub. The pressure fluctuation amplitude at the inlet of the impeller rim decreased with the increase of flow rate;the pressure fluctuation amplitude at the outlet of the impeller rim decreased first and then increased with the increase of flow rate;and the pressure fluctuation amplitude at the outlet of the guide vane rim decreased with the increase of flow rate. The main frequency amplitude of pressure fluctuation at all monitoring points under low flow condition was greater than the ones under optimal operating conditions and high flow condition. The calculation results provide a reference for further analysis of the safe and stable operation of axial flow pump.
The pressure fluctuation is one of the important factors affecting the safe and stable operation of axial-flow pumping system,in order to understand the change rules of pressure fluctuation of the blade region in axial flow pumping system,a threedimensional unsteady numerical simulation was carried out using CFD on the whole flow passage of the vertical axial-flow pumping system. The pressure fluctuation time-domain data of impeller and guide vanes of the axial-flow pumping system were obtained,the pressure pulsation characteristics of each monitoring point during the optimal operating conditions were analyzed,and change rules of pressure fluctuation with flow rate at three characteristic monitoring points were analyzed. The results show that under the optimal operating conditions,the pressure fluctuation amplitude at the inlet of the impeller gradually decreased from the rim to the hub;the pressure fluctuation amplitude at the outlet of the impeller first decreased and then increased from the rim to the hub;the pressure fluctuation amplitude at the outlet of the guide vane first increased and then decreased from the rim to the hub. The pressure fluctuation amplitude at the inlet of the impeller rim decreased with the increase of flow rate;the pressure fluctuation amplitude at the outlet of the impeller rim decreased first and then increased with the increase of flow rate;and the pressure fluctuation amplitude at the outlet of the guide vane rim decreased with the increase of flow rate. The main frequency amplitude of pressure fluctuation at all monitoring points under low flow condition was greater than the ones under optimal operating conditions and high flow condition. The calculation results provide a reference for further analysis of the safe and stable operation of axial flow pump.
引文
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[12]杨帆,赵浩儒,刘超,等.立式轴流泵装置进水流道出口流态及脉动试验分析[J].农业机械学报,2017,48(12):141-146.
[13]冯卫民,程千,郭志伟,等.前置导叶可调式轴流泵低频压力脉动特性研究[J].农业机械学报,2015,46(10):62-67.
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[17]张玉新,王秀叶,丁鹏,等.潜水轴流泵内部流场压力脉动的数值模拟[J].排灌机械工程学报,2014,32(4):302-307.
[18]黎耀军,沈金峰,洪益平,等.叶顶间隙对轴流泵轮缘压力脉动影响的数值预测[J].农业机械学报,2014,45(5):59-64.
[19]王凡,钱忠东,郭志伟,等.可调导叶式轴流泵压力脉动数值分析[J].农业机械学报,2017,48(3):119-123.
[20]王福军.计算流体动力学分析[M].北京:清华大学出版社,2004.
[2]施卫东,邹萍萍,张德胜,等.高比转速斜流泵内部非定常压力脉动特性[J].农业工程学报,2011,27(4):147-152.
[3]张德胜,刘俊龙,耿琳琳,等.斜流泵小流量工况压力脉动数值模拟与实验[J].农业机械学报,2017,48(2):117-125.
[4]宋希杰,刘超,杨帆,等.水泵进水池底部压力脉动特性试验[J].农业机械学报,2017,48(11):196-203.
[5]张德胜,耿琳琳,施卫东,等.轴流泵水力模型压力脉动和振动特性试验[J].农业机械学报,2015,46(6):66-72.
[6]施卫东,张光建,张德胜,等.入口非均匀流对轴流泵性能和压力脉动的影响[J].排灌机械工程学报,2014,32(4):277-282.
[7]Goltz I,Kosyna G,Delgado A.Eliminating the head instability of an axial-flow pump using axial grooves[J].Proceedings of the Institution of Mechanical Engineers Part A Journal of Power&Energy,2013,227(2):206-215.
[8]姚捷,施卫东,吴苏青,等.轴流泵压力脉动数值计算与试验[J].农业机械学报,2013,44(s1):119-124.
[9]Zhang Desheng,Pan Dazhi,Xu Yan,et al.Numerical investigation of blade dynamic characteristics in an axial flow pump[J].Thermal Science,2013,17(5):1511-1514.
[10]Zhang Desheng,Shi Weidong,Chen Bin,et al.Unsteady flow analysis and experimental investigation of axial-flow pump[J].Journal of Hydrodynamics,Ser.B,2010,22(1):35-43.
[11]杨帆,赵浩儒,刘超,等.涡带工况下轴流泵装置内部脉动特性数值分析[J].应用基础与工程科学学报,2017,25(4):670-678.
[12]杨帆,赵浩儒,刘超,等.立式轴流泵装置进水流道出口流态及脉动试验分析[J].农业机械学报,2017,48(12):141-146.
[13]冯卫民,程千,郭志伟,等.前置导叶可调式轴流泵低频压力脉动特性研究[J].农业机械学报,2015,46(10):62-67.
[14]王福军,张玲,张志民.轴流泵不稳定流场的压力脉动特性研究[J].水利学报,2007,38(8):1003-1009.
[15]Shi Weidong,Zhang Desheng,Guan Xingfan,et al.Numerical and experimental investigation of highefficiency axial-flow pump[J].Chinese Journal of Mechanical Engineering,2010,23(1):38-44.
[16]汤方平,张丽萍,付建国,等.轴流泵内部压力脉动数值预测及分析[J].排灌机械工程学报,2013,31(10):835-840.
[17]张玉新,王秀叶,丁鹏,等.潜水轴流泵内部流场压力脉动的数值模拟[J].排灌机械工程学报,2014,32(4):302-307.
[18]黎耀军,沈金峰,洪益平,等.叶顶间隙对轴流泵轮缘压力脉动影响的数值预测[J].农业机械学报,2014,45(5):59-64.
[19]王凡,钱忠东,郭志伟,等.可调导叶式轴流泵压力脉动数值分析[J].农业机械学报,2017,48(3):119-123.
[20]王福军.计算流体动力学分析[M].北京:清华大学出版社,2004.
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