气液两相入流条件下离心泵内部流动诱导特性实验研究

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (9) : 15-21.

论文

司乔瑞1，崔强磊1，袁建平1，张克玉2，袁寿其1

作者信息 +

Tests for flow induced characteristics of a centrifugal pump under air-water two-phase inflow condition

SI Qiaorui1, CUI Qianglei1, YUAN Jianping1, ZHANG Keyu2, YUAN Shouqi1

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文章历史 +

摘要

搭建了泵送气液两相流实验台，以比转速ns=132.2的离心泵为模型进行气液两相入流条件下的流动诱导特性研究，获得了在不同进口含气率下的外特性和压力脉动、振动信号的频谱和概率密度图。研究结果表明：气液两相入流条件下，离心泵在小流量工况时的性能对气体更加敏感；模型泵在入流含气率超过8%以后，性能急剧下降且可测试的工况范围变窄并比较紊乱，能达到的最大入流含气率为10%；气液两相入流条件下，泵出口压力脉动主频仍为叶频，叶频处幅值随着进口含气率的增大而增大，含气率越大低频区的宽频特性越明显；压力脉动信号和振动信号均服从正态分布，随着进口含气率的不断增大，压力脉动的概率密度函数（PDF）幅值逐渐减小而压力幅值跨度逐渐变宽，振动的PDF幅值呈先增大，然后减小，在进口含气率为5%时达到最小（仍大于纯水工况），然后再增大的趋势，两者均可作为流态监测的重要依据。

Abstract

A two-phase flow liquid pumping test ring was built in order to study the flow induced characteristics of centrifugal pumps under air-water two-phase inflow condition. Pump performance were measured of a specific speed ns=132.2 centrifugal pump under different flow rate and different inlet air void fraction，pressure pulsation and vibration signal spectrum and their probability density map were also obtained for analyze. The results show that the performance of centrifugal pump is more sensitive to air in small flow condition under air-water two-phase inflow condition. The performance drops sharply when the air void fraction is more than 8%，and the range of data collected is narrower and more disorganized. The maximum air void fraction of model pump could reach 10% when the pump operates normally. The dominant frequency of pump outlet pressure pulsation is still at the blade passing frequency even under air-water two-phase condition. Frequency amplitude increases with the increase of inlet air void fraction. The greater of the inlet air void fraction，the more obvious of the rate of low frequency broadband characteristics. The pressure fluctuation signal and vibration signal are both obey the normal distribution. With the increase of inlet gas content, the probability density function （PDF）amplitude of pressure pulsation decreases gradually，and its amplitude span becomes wider gradually. The corresponding is that the amplitude of the probability density function of vibration increases first，then decreases，and reaches the minimum when the inlet gas content is 5% (which is still greater than that without air)，and then increases. Therefore，the variation law of this two signals with different inlet air void fraction could be used as an important basis for flow monitoring.

导出引用

司乔瑞1，崔强磊1，袁建平1，张克玉2，袁寿其1. 气液两相入流条件下离心泵内部流动诱导特性实验研究[J]. 振动与冲击, 2019, 38(9): 15-21

SI Qiaorui1, CUI Qianglei1, YUAN Jianping1, ZHANG Keyu2, YUAN Shouqi1. Tests for flow induced characteristics of a centrifugal pump under air-water two-phase inflow condition[J]. Journal of Vibration and Shock, 2019, 38(9): 15-21

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