不同流量工况下混流泵压力脉动试验

发布时间：2019-03-21 14:49

【摘要】：为了研究混流泵叶轮和导叶非定常时序干涉引起的压力脉动特性,通过试验对混流泵泵体关键测点进行了压力脉动测量,分析了不同流量工况下叶轮进口、叶轮中部、叶轮出口、导叶进口、导叶出口以及装置出口等位置压力脉动的时域和频域响应。研究结果表明:叶轮旋转周期较大程度影响了叶轮进口、叶轮中部监测点的压力脉动,脉动曲线出现了与叶轮叶片数相一致的4个波峰和4个波谷,压力脉动主频为叶轮叶片通过频率;叶轮和导叶的动静干涉作用使得叶轮出口和导叶进口监测点压力脉动在小流量工况下分别出现7~12个波峰和波谷,压力脉动频谱范围变大,分频成分增多,主频随着流量减小向高频方向偏移,动静干涉诱导的流体激振以及噪声等高频成分出现并逐渐增多。叶轮中部监测点的压力脉动幅值最大且对流量变化最敏感,远离叶轮区各监测点的压力脉动受流量变化的影响较小。
[Abstract]:In order to study the pressure fluctuation characteristic of the unsteady time-sequence interference of the impeller and guide vane of the mixed-flow pump, the pressure pulsation of the key point of the pump body of the mixed-flow pump was measured by the test, and the inlet of the impeller, the middle part of the impeller, the outlet of the impeller and the inlet of the guide vane were analyzed. The time domain and frequency domain response of pressure pulsation at the outlet of the guide vane and the outlet of the device. The results show that the rotation period of the impeller greatly influences the inlet of the impeller and the pressure pulsation of the monitoring points in the middle of the impeller. The pulsation curve shows four peaks and four wave troughs which are consistent with the number of the impeller blades. The main frequency of the pressure pulse is the frequency of the impeller blades. the dynamic and static interference effects of the impeller and the guide vane cause the pressure pulsation of the impeller outlet and the guide vane inlet monitoring point to respectively have 7 to 12 peaks and wave troughs under small flow conditions, the pressure fluctuation spectrum range is large, the frequency division component is increased, and the main frequency is shifted to the high-frequency direction with the flow reduction, The high-frequency components, such as fluid excitation and noise induced by dynamic and static interference, appear and gradually increase. The pressure pulsation amplitude of the monitoring point of the middle part of the impeller is the largest and is most sensitive to the change of the flow rate, and the pressure fluctuation of each monitoring point remote from the impeller area is less influenced by the change of the flow.
【作者单位】：江苏大学流体机械工程技术研究中心;
【基金】：国家自然科学基金项目(51409127、51679111、51579118) “十二五”国家科技支撑计划项目(2015BAB07B06) 江苏省重点研发计划项目(BE2015119、BE2015001-4) 江苏省六大人才高峰项目(HYZB-002) 江苏省自然科学基金项目(BK20161472) 江苏高校优势学科建设工程项目(PAPD) 江苏大学高级专业人才科研启动基金项目(13JDG105)
【分类号】：TH313

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