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 120dB.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.
作者
李照
LI Zhao(Yunnan Hengcheng Construction Supervision Consulting Co. Ltd.,Kunming 650051,China)
出处
《中国农村水利水电》
北大核心
2018年第12期134-137,142,共5页
China Rural Water and Hydropower
关键词
混流泵
反向发电
压力脉动
流动噪声
叶片通过频率
mixed flow pump
reverse power generation
pressure pulsation
flow noise
blade passing frequency
作者简介
李照(1972-),男,副高级工程师,主要从事工程管理和工程施工监理等方面工作。E-mail:1007422002@qq.com。
