Investigation of instabilities of cavitation at low flow rate of centrifugal pump

被引：0

作者：

National Research Center of Pumps, Jiangsu University, Zhenjiang ^{[1
]}

212013, China

不详 ^{[2
]}

212013, China

机构：

[1] National Research Center of Pumps, Jiangsu University, Zhenjiang

[2] School of Mechanical Engineering, Jiangsu University, Zhenjiang

来源：

Nongye Jixie Xuebao | / 8卷 / 54-58期

关键词：

Cavitation; Centrifugal pump; Low flow rate; Pressure pulsation;

D O I：

10.6041/j.issn.1000-1298.2015.08.009

中图分类号：

学科分类号：

摘要：

In order to investigate the instabilities of cavitation at low flow rate of centrifugal pump, with the development of cavitation in a centrifugal pump, the characteristics of the internal flow, inlet and outlet pressure pulsations of the pump were researched through numerical simulation and experiment. It was found that the rotor-stator interaction between the volute tongue and impeller made a significant influence on the internal flow instabilities of a centrifugal pump under low flow rate condition. The vortexes generated by the influence of cavitation and volute tongue presented in opposite directions. The dominant frequency of the pump inlet pressure pulsations was two times shaft frequency, which migrated to low frequency with certain fluctuations with the development of cavitation. The peak which existed at two times blade passing frequency of the pump inlet pressure pulsations vanished when the cavitation developed to a certain degree. The dominant frequency of the pump outlet pressure pulsations was the blade passing frequency resulted from the rotor-stator interaction between the volute tongue and impeller. The peak which existed at two times shaft frequency presented intensive fluctuations. The broadband pulsations of both pump inlet and outlet pressure pulsations changed obviously with the decrease of available net positive suction head. ©, 2015, Chinese Society of Agricultural Machinery. All right reserved.

引用

页码：54 / 58

页数：4

共 18 条

[1] Wang S., Tan L., Wang Y., Characteristic of transient cavitation flow and pressure fluctuation for a centrifugal pump, Journal of Vibration and Shock, 32, 22, pp. 168-173, (2013)
[2] Li X., Yuan S., Pan Z., Et al., Analysis of cavitation head drop in centrifugal pump with inducer, Transactions of the Chinese Society for Agricultural Machinery, 42, 9, pp. 89-93, (2011)
[3] Su Y., Wang Y., Duan X., Cavitation experimental research on centrifugal pump, Transactions of the Chinese Society for Agricultural Machinery, 41, 3, pp. 77-80, (2010)
[4] Chudina M., Noise as an indicator of cavitation in a centrifugal pump, Acoustical Physics, 49, 4, pp. 463-474, (2003)
[5] Cernetic J., The use of noise and vibration signals for detecting cavitation in kinetic pumps, Proc. IMech E, Part C: Journal of Mechanical Engineering Science, 223, 7, pp. 1645-1655, (2009)
[6] Ni Y., Pan Z., Li H., Et al., Application of characters of discharge pressure fluctuation to monitor of centrifugal pump, Journal of Drainage and Irrigation Machinery Engineering, 24, 5, pp. 40-43, (2006)
[7] Si Q., Yuan S., Li X., Et al., Numerical simulation of unsteady cavitation flow in the casing of a centrifugal pump, Transactions of the Chinese Society for Agricultural Machinery, 45, 5, pp. 84-89, (2014)
[8] Huang X., Liu Z., Yang W., Cavitation characteristics of centrifugal pump near wear-ring clearance, Transactions of the Chinese Society for Agricultural Machinery, 46, 2, pp. 59-63, (2015)
[9] Shi H., Li Y., Research on the inlet backflow and its control in a centrifugal pump, Pump Technology, 3, pp. 27-29, (2000)
[10] Huang J., Study on inlet reverse flow for open-type and closed-type centrifugal pump, Journal of Engineering Thermophysics, 18, 1, pp. 43-47, (1997)

← 1 2 →