高比转速斜流泵内部压力脉动特性的实验研究

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (9) : 27-34.

论文

张德胜王超超董亚光石磊金永鑫

作者信息 +

Tests for inner pressure fluctuation features in an oblique flow pump with high ratio rotating speed

ZHANG Desheng, WANG Chaochao, DONG Yaguang, SHI Lei, JIN Yongxin

Author information +

文章历史 +

摘要

为了研究不同工况下高比转速斜流泵内部压力脉动特性和规律，选取某高比转速斜流泵模型为研究对象，在斜流泵叶轮进口段至导叶出口段设置7个压力脉动监测点，采用微型压力脉动传感器采集不同工况下的压力脉动时域信号，并进行频域特性分析。实验结果表明，不同流量工况下，叶轮进口到导叶出口的压力脉动幅值依次降低，同时压力脉动所呈现出的周期性相似波动规律也依次减弱。叶轮进口压力脉动周期性相似波动规律较好，压力脉动幅值也最大，而叶轮出口受叶轮进口流动分离形成的低频大尺度漩涡及叶顶泄漏涡的影响，在小流量工况下的压力脉动周期性相似波动规律相对减弱。导叶进口只有在额定工况1.0Qopt下压力脉动才有动静相干周期性相似波动规律，而导叶出口处的压力脉动幅值最小且在受到导叶数及其发生失速可能产生的低频大尺度漩涡和叶轮出口回流等漩涡的影响，在小流量工况下呈现较弱的周期性相似波动规律。此外，不同工况下叶轮进出口及导叶进口的压力脉动主频都是叶片通过频率，同时叶轮进出口还存在叶片通过频率的高阶谐波，但在导叶出口处的压力脉动主频随流量的变化而变化。

Abstract

The pressure fluctuation data of seven pressure monitoring points from inlet to outlet was measured at different flow rates to investigate the characteristics of pressure fluctuation in high specific speed mixed-flow pump. The pressure fluctuation time domains signal at different flow condition was collected by micro-pressure fluctuation sensor, and the frequency domains characteristic analysis was carried out.The experimental results indicate that the amplitude of pressure fluctuation from the inlet of the impeller to the outlet of the guide vane decreases in turn, meanwhile the periodicity of the pressure fluctuation also decreases.the pressure fluctuation at impeller inlet is periodical, and the pressure fluctuation amplitude is maximum, while the impeller outlet is affected by the the tip leakage vortex and low frequency and large-scale vortices formed by the flow separation at impeller inlet, the periodicity of pressure fluctuation at low flow rates is weakened. The pressure fluctuation at guide vane inlet is periodical only under the rated conditions 1.0Qopt, while the pressure fluctuation amplitude is minimum at guide vane outlet and affected by the number of guide vanes and low frequency and large-scale vortices possibly generated by the stalls and reflux vortices at impeller outlet, showing a weaker periodicity of the pressure fluctuation at low flow rates. In addition, the main frequencies of pressure fluctuation at impeller inlet, impeller outlet and guide vanes inlet is blades passing frequency. and the higher order harmonics of blades passing frequency exist at the inlet and outlet of the impeller. But the main frequencies of pressure fluctuation at guide vanes outlet is changed under different flow rates.

导出引用

张德胜王超超董亚光石磊金永鑫. 高比转速斜流泵内部压力脉动特性的实验研究[J]. 振动与冲击, 2019, 38(9): 27-34

ZHANG Desheng, WANG Chaochao, DONG Yaguang, SHI Lei, JIN Yongxin. Tests for inner pressure fluctuation features in an oblique flow pump with high ratio rotating speed[J]. Journal of Vibration and Shock, 2019, 38(9): 27-34

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