Transient characteristics of a cavitating centrifugal pump system at rapid change in flow rate
Book
·
OSTI ID:100919
- Kyushu Inst. of Tech., Kitakyushu (Japan). Dept. of Mechanical Engineering
A series of studies on dynamic characteristics of noncavitating centrifugal pump under a variety of unsteady operations were extended to the cavitating case. Experimental study was carried out on transient behavior of cavitating centrifugal pump during sudden opening or closure of discharge valve. Instantaneous rotational speed, suction and discharge pressures, and flow rate are measured during the transient period when the discharge valve was closed/opened quickly. The quick opening/closure was achieved by a pneumatic ball valve installed in discharge line. The changing rate of flow rate can be adjusted by controlling the pressure of compressed air. The experimental parameters are the suction pressure and changing rate in unsteady operation. And the effect of inlet and delivery pipe length was also investigated. The dynamic relations of total pressure rise to flow rate were compared with the quasi-steady ones. The experimental results indicate that the transient performance of the pump with cavitation shows a quite different change from quasi-steady one. Moreover, it was presented that a rapid change in boundary condition results in a low cycle pressure oscillation. The occurrence of the oscillation depends on the speed of valve opening/closure and the suction pressure, and that is nearly independent of inlet and discharge pipe length. On the other hand, the frequency of the pressure oscillation was found to be related to the inlet nd discharge pipe length only for the valve closure case.
- OSTI ID:
- 100919
- Report Number(s):
- CONF-940659--; ISBN 0-7918-1373-8
- Country of Publication:
- United States
- Language:
- English
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