立式轴流泵装置压力脉动特性的试验

发布时间：2018-08-13 19:35

【摘要】：为了分析不同流量时立式轴流泵装置进出水过流部件压力脉动特性,在进水流道出口段、出水流道渐扩段的壁面共设置7个压力脉动监测点进行实时测量,并采用快速傅里叶变换对时域数据进行处理。结果表明:进水流道出口段监测点P1,P2时域图为正弦波形,一个周期内波峰波谷数与叶片数相同,此时的脉动峰峰值远大于监测点P4,P6;出水流道渐扩段监测点P4,P6峰峰值从1.2Qbep到0.3Qbep先减小后增大,最优流量时脉动峰峰值最小。基于频谱分析,在不同流量时进水流道出口段各测点压力脉动的主频均为转频及其谐频,出水流道渐扩段监测点脉动幅值随流量的增大先减小后增大,且在最优工况时脉动幅值为最小值。转频对出水流道渐扩段处各监测点脉动频率的影响未呈现规律性。
[Abstract]:In order to analyze the pressure fluctuation characteristics of the inlet and outlet parts of the vertical axial flow pump at different flow rates, seven pressure fluctuation monitoring points were set on the wall of the inlet outlet and the outlet gradually expanding section for real-time measurement, and the time-domain data were processed by fast Fourier transform. P2 time domain diagram is sinusoidal waveform, and the number of wave crests and valleys is the same as the number of blades in a cycle. The peak value of the fluctuation peak is much larger than that of the monitoring point P4, P6. The peak value of the monitoring point P4 and P6 in the gradual expansion section of the outlet channel decreases first and then increases from 1.2Qbep to 0.3Qbep, and the peak value of the fluctuation peak is the smallest when the optimal flow rate is from 1.2Qbep to 0.3Qbep. The main frequency of pressure fluctuation at each measuring point in the outlet section is rotation frequency and its harmonic frequency. The amplitude of pressure fluctuation at the monitoring point in the gradual expansion section of the outlet channel decreases first and then increases with the increase of flow rate, and the amplitude of pressure fluctuation is the minimum at the optimum working condition.
【作者单位】：扬州大学;江苏省水利勘测设计研究院有限公司;
【基金】：国家自然科学基金资助项目(51609210) 江苏省自然科学基金资助项目(BK20150457) 流体及动力机械教育部重点实验室开放课题资助项目(szjj2016-078) 江苏省研究生科技创新计划项目(SJLX16_0596)
【分类号】：TH312

【参考文献】