高比转数混流泵非定常流场压力脉动特性

doi:10.3969/j.issn.1674-8530.2013.02.003

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Abstract In order to study the pressure fluctuation of a high specific speed mixedflow pump, large eddy simulation was conducted to simulate the threedimensional unsteady turbulent flow field in the mixedflow pump. By monitoring and analyzing pressures, the pressure fluctuations of both timedomain and frequencydomain at impeller inlet, impeller outlet, guide vane channels and guide vane outlet were obtained. Main causes of pulse pressure were discussed and pressure pulsations under different flow rates were compared. Studies have shown that: the pressure pulse amplitudes at impeller inlet, impeller outlet, guide vane channels and guide vane outlet, have all gradually increased from hub to tip; pressure pulsation of time domain at impeller inlet shows no regularity while those at the impeller outlet presented four small cycles. Pressure pulses at impeller inlet and outlet are mainly determined by impeller rotation frequency. Pressure pulsation effects of the impeller on the fluid gradually decline, pressure pulsation is mainly low frequency vibration and pulse amplitude has greatly diminished at the vane channels and vane outlet. However, under low flow rates, the manifestation of pressure pulsation is greater amplitude and slight influence of flow on dominant frequency; under large flow rates, pressure pulsations are better than that under small flow rates.

Key words： high specific speed mixedflow pump unsteady flow field pressure fluctuation large eddy simulation

Received: 29 May 2012 Published: 28 February 2013

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	WANG Chun-Lin
	JIA Fei
	WU Zhi-Wang
	LIU Dong

Cite this article:

WANG Chun-Lin,JIA Fei,WU Zhi-Wang等. Pressure fluctuation of unsteady flow in high specific speed mixedflow pump[J]. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(2): 103-108.

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http://zzs.ujs.edu.cn/pgjx/EN/10.3969/j.issn.1674-8530.2013.02.003 OR http://zzs.ujs.edu.cn/pgjx/EN/Y2013/V31/I2/103

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