Transient Behavior of a Cavitating Centrifugal Pump at Rapid Change in Operating Conditions—Part 1: Transient Phenomena at Opening/Closure of Discharge Valve

Author:

Tanaka T.1,Tsukamoto H.2

Affiliation:

1. Department of Mechanical and Electrical Engineering, Yatsushiro National College of Technology, Yatsushiro, 866-8501, Japan

2. Department of Mechanical Engineering, Kyushu Institute of Technology, Tobata, Kitakyushu, 804-8550, Japan

Abstract

A series of studies on the dynamic characteristics of noncavitating centrifugal pumps were extended to the cavitating case. An experimental study was carried out on the transient behavior of a cavitating centrifugal pump at the sudden opening/closure of the discharge valve. Cavitation behavior in the centrifugal pump was visualized during the transient period by using high speed video camera, and instantaneous pressure and flowrate were measured at the pump suction and discharge section with rotational speed during the transient period. Unsteady pressure, as well as flowrate, was related to the time-dependent cavitation behavior. As a result of the present study, pressure and flowrate fluctuations were found to occur due to oscillating cavitation or water column separation at rapid transient operations.

Publisher

ASME International

Subject

Mechanical Engineering

Reference13 articles.

1. Barrand, J. P., 1996, “Qualitative Flow Visualizations During Fast Start-up of Centrifugal Pumps,” Hydraulic Machinery and Cavitation, E. Cabrera et al., ed., Kluwer Academic Publishers, pp. 671–680.

2. Barrand J. P. , GheliciN., and CaignaertG., 1993, “Unsteady Flow During The Fast Start-Up of a Centrifugal Pump,”, Pumping Machinery ASME FED-Vol. 154, pp. 143–150.

3. Greitzer E. M. , 1981, “The Stability of Pumping Systems,” ASME JOURNAL OF FLUIDS ENGINEERING, Vol. 103, pp. 193–242.

4. Kaneko M. , and OhashiH., 1982, “Transient Characteristics of a Centrifugal Pump During Quick Change of Flow Rate,” Trans. JSME, Series B, Vol. 48, No. 426, pp. 229–237. (in Japanese).

5. Knapp R. T. , 1937, “Complete Characteristics of Centrifugal Pumps and Their Use in the Prediction of Transient Behavior,” Trans. ASME, Vol. 59, pp. 683–689.

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