Research on the Flow and Cavitation Characteristics of Multi-Stage Throttle in Water-Hydraulics

Abstract

In water-hydraulic power systems cavitation is more likely to happen than in oil-hydraulic power systems because of the high vaporous pressure of water. A multi-stage throttle, which consists of two or more orifices in a throttle, is an effective way to avoid or reduce cavitation damage. In this research, the cavitation characteristics of two-stage throttles are analysed theoretically and compared with a single-stage. Then, experiments are conducted to investigate the flow and cavitation characteristics of multi-stage throttles including two kinds of two-stage throttles and one of a three-stage kind. All the experiments are carried out under the two cases with and without backpressure, respectively. The working medium is tap water. Experimental results show that the shape of the multi-stage throttle and operating conditions have remarkable effects on the flow and cavitation characteristics.

Keywords

water hydraulics flow characteristics cavitation multi-stage throttle

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References

Urata

Technological aspects of the new water hydraulic. In Proceedings of the Sixth Scandinavian International Conference on

Fluid power, Tampere, Finland, May 26-28, 1999, pp. 21–34.

Varandili

Properties of tap water as a hydraulic pressure medium. In Proceedings of the Sixth Scandinavian International Conference on

Fluid power, Tampere, Finland, May 26-28, 1999, pp. 113–127.

Yamaguchi

Saito

Cavitation in hydraulic fluids. Part V: Effects of fluid properties and orifice materials on cavitation in long orifices

J. Fluid Control, 1987, 18 (1), 19–33.

Koivula

T. S.

Ellman

A. U.

Cavitation behaviour of hydraulics orifices and valves. SAE paper 982038, 1998.

Sukuzi

Urata

Improvement of cavitation resistive property of a water hydraulic relief valve. In Proceedings of the 8th SICFP'03, May 7-9, 2003, Tampere, Finland, pp. 265–276.

Johnston

D. N.

Edge

K. A.

Vaughan

N. D.

Experimental investigation of flow and force characteristics of hydraulic poppet and disc valves

Proc. Instn Mech. Engrs, Part A: J. Power and Energy, 1991, 205, 161–171.

Oshima

Ichikawa

Cavitation phenomena and performance of oil Hydraulic Valve (1st Report, Mechanism of Generation of Cavitation and flow performance), Trans. Jpn. Soc. Mech. Engrs, Series B, 1985, 51, 427–435.

Oshima

Leino

Linjama

Koskinen

K. T.

Vilenius

Effect of cavitation in water hydraulic poppet valves

Int. J. Fluid Power, 2001, 2 (3), 5–13.

Zhu

B. H.

Huang

Zhang

T. H.

Z. Y.

Experimental investigation of flow characteristics of small orifices and valves in water hydraulics

Proc. Instn Mech. Engrs, Part E: J. Process Mechanical Engineering, 2002, 216, 235–245.

10.

Leino

Koskinen

K. T.

Vilenius

Numerical and experimental investigation of cavitating flow in water hydraulic seat valve. In Proceedings of the Sixth International Conference on

Fluid power and transmission, Hangzhou, China, 2005, pp. 463–467.

11.

Liu

Y. S.

Nie

S. L.

Zhu

Y. Q.

Z. Y.

Experimental study of effects of operating conditions on the flow and cavitation characteristics of water hydraulic throttle

J. Chin. Mech. Eng, 2004, 17 (3), 450–453.

12.

Ueno

Okajima

Tanaka

Hasegawa

Noise measurement and numerical simulation of oil flow in pressure control valves

JSME Int. J., Series B, 1994, 37 (2), 336–341.