混流泵反向发电压力脉动及流动诱导噪声分析
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摘要
为研究混流泵在进行反向发电时的压力脉动规律及流动诱导噪声分布规律,对混流泵全流道进行三维数值模拟,得出压力脉动幅值在转轮出口处最大,约为转轮进口的1.3倍,约为导叶进口的3倍,压力脉动幅值从轮毂到轮缘逐渐减小。导叶进口处压力脉动主频为转频,转轮进口处压力脉动主频为叶频。采用边界元法对混流泵进行法向发电时的声场进行研究,转轮区与导叶区产生的噪声以离散噪声为主,最大声压级可达120dB。因混流泵的固体结构与水流发生共振,压力脉动主频与流动诱导噪声主频不一致,使得噪声三阶叶频的声压级增大,约为叶片通过频率声压级的1.1倍。
In order to study the pressure pulsation law and the distribution law of the flow induced noise in the reverse power generation of the mixed flow pump,the three-dimensional numerical simulation of the full flow passage of the mixed flow pump is carried out.The maximum pressure fluctuation amplitude at the outlet of the runner is about 1.3 times that of the inlet of the runner,about 3 times the inlet of the guide blade,and the amplitude of the pressure pulsation from the hub to the wheel.The margin has gradually diminished.The main frequency of the pressure pulsation at the inlet of the guide vane is the rotation frequency,and the main frequency of the pressure pulsation at the inlet of the runner is the blade frequency.The boundary element method is used to study the sound field of the mixed flow pump in normal power generation.The noise generated by the runner area and the guide leaf area is mainly discrete noise,and the maximum sound pressure level can reach 120 dB.Because the solid structure of the mixed flow pump resonances with the water flow,the main frequency of the pressure pulsation is not consistent with the main frequency of the flow induced noise,which makes the sound pressure level of the three order leaf frequency of the noise increase,about 1.1 times that of the blade passing through the frequency sound pressure level.
In order to study the pressure pulsation law and the distribution law of the flow induced noise in the reverse power generation of the mixed flow pump,the three-dimensional numerical simulation of the full flow passage of the mixed flow pump is carried out.The maximum pressure fluctuation amplitude at the outlet of the runner is about 1.3 times that of the inlet of the runner,about 3 times the inlet of the guide blade,and the amplitude of the pressure pulsation from the hub to the wheel.The margin has gradually diminished.The main frequency of the pressure pulsation at the inlet of the guide vane is the rotation frequency,and the main frequency of the pressure pulsation at the inlet of the runner is the blade frequency.The boundary element method is used to study the sound field of the mixed flow pump in normal power generation.The noise generated by the runner area and the guide leaf area is mainly discrete noise,and the maximum sound pressure level can reach 120 dB.Because the solid structure of the mixed flow pump resonances with the water flow,the main frequency of the pressure pulsation is not consistent with the main frequency of the flow induced noise,which makes the sound pressure level of the three order leaf frequency of the noise increase,about 1.1 times that of the blade passing through the frequency sound pressure level.
引文
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[13]郭维东,赵光昱.WES堰下泄水流噪声试验数值模拟分析[J].中国农村水利水电,2015,(3):127-134.
[14]司乔瑞.离心泵低噪声水力设计及动静干涉机理研究研究[D].江苏镇江:江苏大学,2014.
[2]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):1 003-1 009.
[3]郑源,张飞,蒋小欣,等.贯流泵装置模型试验叶轮出水口压力脉动研究[J].流体机械,2007,35(1):1-3.
[4]李辰光,王福军,许建中.两级双离心泵压力脉动特性[J].农业机械学报,2011,42(7):41-4.
[5]董亮,代翠,孔繁余.叶片出口安放角对离心泵作透平噪声的影响[J].农业工程报,2015,31(6):69-75.
[6]袁寿其,薛菲,袁建平.离心泵压力脉动对流动噪声影响的试验研究[J].排灌机械工程学报,2009,27(5):287-290.
[7]朱荣生,苏保稳,杨爱玲,等.离心泵压力脉动特性分析[J].农业机械学报,2010,41(11):43-47.
[8]F Shi.Numerical Study of Pressure Fluctuations Caused by ImpellerDiffuser Interaction in a Diffuser Pump Stage[J]. Trans. asme J. fluids Eng,2001,123(3):466-474.
[9]张付林,郑源,孙奥冉.超低扬程贯流泵模型试验的压力脉动研究[J].中国农村水利水电,2017,(11):173-176.
[10]黄茜,袁寿其,方玉建.多级离心泵多工况压力脉动数值模拟[J].中国农村水利水电,2016,(10):191-195.
[11]代翠.离心泵作透平流体诱发噪声特性理论数值与试验研究[D].江苏镇江:江苏大学,2014.
[12]郑源,陈宇杰,毛秀丽.混流泵压力脉动特性及其对流动诱导噪声的影响[J].农业工程学报,2015,31(23):67-73.
[13]郭维东,赵光昱.WES堰下泄水流噪声试验数值模拟分析[J].中国农村水利水电,2015,(3):127-134.
[14]司乔瑞.离心泵低噪声水力设计及动静干涉机理研究研究[D].江苏镇江:江苏大学,2014.