侧壁式压水室离心泵小流量非稳态旋转失速特性

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (6) : 189-194.

论文

用数值计算方法研究具有特殊结构的侧壁式压水室离心泵，分析小流量工况时模型泵的非稳态旋转失速特性，用快速傅里叶变换(FFT)获得压力脉动信号的频谱特征。结果表明，小流量工况时模型泵的扬程曲线呈驼峰状，压水室不同位置处压力分布不均；受叶轮旋转产生的非稳态作用影响，叶轮不同叶片流道内流动结构差异较大。不同流量下，叶轮内部分离涡结构诱发的激励频率各异，0.4ФN工况时模型泵压力脉动频谱图出现0.5fR及高次谐波频率，压力脉动最大幅值出现于4fR频率处；0.2ФN流量时非定常流动结构会诱发0.18fR及高次谐波频率；0.05ФN流量时压力脉动频谱图同时出现0.1fR、0.28fR两种激励频率。旋转失速现象出现时，频谱图中叶频处压力脉动幅值不再起主导作用。

作者信息 +

Unsteady rotating stall characteristics in a centrifugal pump with slope volute at low flow rates

Numerical simulation method was used to analyze unsteady rotating stall characteristics in a centrifugal pump with slope volute at low flow rates. Fast Fourier Transform (FFT) was applied to transform time domain pressure signals to frequency domain signals. Results show that: hump phenomenon occurs in head curve of model pump, and pressure distribution at different position of slope volute is not uniform. Flow structure in each impeller channel differs, which is influenced by unsteady effect generated by rotating impeller. At different operating conditions pressure pulsation signals are different leading to variable excitation frequencies existing in pressure spectrum. Working at 0.4ФN condition, 0.5fR and its higher harmonics appear in pressure spectra, and pressure magnitude reaches maximum value at 4fR. At flow rate 0.2ФN, excitation frequencies 0.18fR and its harmonics occur. At 0.05ФN, two different excitation frequencies 0.1fR and 0.28fR appear in pressure spectra induced by unsteady flow structure in impeller channels. Pressure amplitude at blade passing frequency does not keep the predominant role in pressure spectra at rotating stall status.

Author information +

文章历史 +

摘要

用数值计算方法研究具有特殊结构的侧壁式压水室离心泵，分析小流量工况时模型泵的非稳态旋转失速特性，用快速傅里叶变换(FFT)获得压力脉动信号的频谱特征。结果表明，小流量工况时模型泵的扬程曲线呈驼峰状，压水室不同位置处压力分布不均；受叶轮旋转产生的非稳态作用影响，叶轮不同叶片流道内流动结构差异较大。不同流量下，叶轮内部分离涡结构诱发的激励频率各异，0.4ФN工况时模型泵压力脉动频谱图出现0.5fR及高次谐波频率，压力脉动最大幅值出现于4fR频率处；0.2ФN流量时非定常流动结构会诱发0.18fR及高次谐波频率；0.05ФN流量时压力脉动频谱图同时出现0.1fR、0.28fR两种激励频率。旋转失速现象出现时，频谱图中叶频处压力脉动幅值不再起主导作用。

Abstract

Numerical simulation method was used to analyze unsteady rotating stall characteristics in a centrifugal pump with slope volute at low flow rates. Fast Fourier Transform (FFT) was applied to transform time domain pressure signals to frequency domain signals. Results show that: hump phenomenon occurs in head curve of model pump, and pressure distribution at different position of slope volute is not uniform. Flow structure in each impeller channel differs, which is influenced by unsteady effect generated by rotating impeller. At different operating conditions pressure pulsation signals are different leading to variable excitation frequencies existing in pressure spectrum. Working at 0.4ФN condition, 0.5fR and its higher harmonics appear in pressure spectra, and pressure magnitude reaches maximum value at 4fR. At flow rate 0.2ФN, excitation frequencies 0.18fR and its harmonics occur. At 0.05ФN, two different excitation frequencies 0.1fR and 0.28fR appear in pressure spectra induced by unsteady flow structure in impeller channels. Pressure amplitude at blade passing frequency does not keep the predominant role in pressure spectra at rotating stall status.

导出引用

张宁，杨敏官，高波，李忠，王兴宁. 侧壁式压水室离心泵小流量非稳态旋转失速特性[J]. 振动与冲击, 2015, 34(6): 189-194

ZHANG Ning，YANG Min-guan，GAO Bo，LI Zhong，WANG Xing-ning. Unsteady rotating stall characteristics in a centrifugal pump with slope volute at low flow rates[J]. Journal of Vibration and Shock, 2015, 34(6): 189-194

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