离心泵入口压力在汽蚀工况下的分频带混沌特性研究

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Abstract Pressure fluctuation signals of a centrifugal pump inlet under different effective net positive suction head available (NPSHa) conditions were measured using dynamic pressure sensors.The3-layer 8-band wavelet packetdecomposition was done for the pressure signals.Wavelet packet decomposition coefficients were taken as time series to calculate 3 chaotic characteristic parameters including the maximal Lyapunov exponent, correlation dimension and K2 entropy.These parameters’ features and changelaws were analyzed and discussed.Results showed that the first 3 of decomposition coefficients in 8-band all have typical chaotic features; 3 chaotic characteristic parameters can be used to describe the system’s chaotic characteristics from different angles, and divide cavitation conditions corresponding to different NPSHa values into 4 different cavitation stages.

Key words： centrifugal pump cavitation wavelet packet frequency band chaotic characteristics

Received: 17 July 2019 Published: 28 November 2020

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	LIANG Chao
	ZHOU Yunlong
	YANG Ning
	LIU Qichao

Cite this article:

LIANG Chao,ZHOU Yunlong,YANG Ning, et al. Chaotic characteristics of multi-frequency band of centrifugal pump inlet pressure under cavitation condition[J]. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(23): 71-77.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2020/V39/I23/71

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