立式混流泵装置压力脉动的模型试验分析

doi:10.13229/j.cnki.jdxbgxb20170216

摘要/Abstract

摘要： 为研究立式混流泵装置内部压力脉动特性,通过模型试验的方法,对某混流泵装置不同叶轮叶片安放角(-2°、0°、2°)下叶轮进口和导叶出口的压力脉动进行采集,通过傅里叶变换后比较分析得出:混流泵装置叶轮进口和导叶出口压力脉动峰峰值均具有一定的规律性,不同叶片安放角下叶轮进口压力脉动峰峰值均大于导叶出口,小流量区域表现得更为明显;建立了泵装置稳定性微观与宏观间的联系,得出高效区附近可以通过压力脉动来反映机组波动性;叶轮进口压力脉动受叶片数的影响,主要以叶频为主,导叶出口压力脉动在1倍转频处幅值最大,受导叶片数影响不大;混流泵装置最优运行区域为最优扬程的0.75~1.15倍区域,运行扬程超出这个范围,压力脉动峰峰值明显增大。

关键词: 机械设计, 立式混流泵装置, 模型试验, 压力脉动相对幅值, 峰峰值, 频谱

Abstract: In order to study the internal pressure pulsation characteristics of vertical mixed-flow pump, by model test, the impeller inlet and vane outlet pressure pulsations were collected with different impeller blade placement angles of -2°, 0° and 2°. By Fourier transformation we found that the peak values of the pressure pulsation of the impeller inlet and vane outlet have certain regularity. With different blade placement angles, the peak value of the pressure pulsation of the impeller inlet is always larger than that of vane outlet, especially in small flow area. The micro and macro stability relationship of the pump is established by comparing the peak value of the pressure pulsation with the head and shaft power variance, and the stability of the pump can be obtained from the pressure pulsation in the vicinity of the high efficiency area. However, both in large and small flow areas, the pressure pulsation is no longer able to reflect the stability of the pump. By analyzing the frequency domain map, we can get four conclusions. First, the impeller inlet is affected by the number of blades, mainly by blade frequency. Second, the vane outlet is less affected by the number of vanes. Third, the amplitude of pressure pulsation of vane outlet approaches maximum at one times of the frequency. Last, the pulsation frequency is smaller under the optimal working point of each blade. Under each blade angle of the pump efficient area, the peak value of the pulsation of the impeller inlet and vane outlet reaches the minimum. When under 1.15 times of the optimum flow rate, the peak value reaches maximum. The impeller inlet is about 1.24 times of the peak value in the optimal working condition, while, the vane outlet maximum is about 1.57 times. The best run area of the mixed-flow pump is 0.75 to 1.15 times of the optimal head. The peak value of pressure pulsation is obviously increased when the running head is out of this range.

Key words: mechanical design, vertical mixed-flow pump system, model test, pressure pulsation relative amplitude, peak-peak value, frequency domain diagram

中图分类号:

TH313

谢传流, 汤方平, 孙丹丹, 张文鹏, 夏烨, 段小汇. 立式混流泵装置压力脉动的模型试验分析[J]. 吉林大学学报(工学版), 2018, 48(4): 1114-1123.

XIE Chuan-liu, TANG Fang-ping, SUN Dan-dan, ZHANG Wen-peng, XIA Ye, DUAN Xiao-hui. Model experimental analysis of pressure pulsation in vertical mixed-flow pump system[J]. 吉林大学学报(工学版), 2018, 48(4): 1114-1123.

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