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Research Papers: Fluid-Structure Interaction

Experimental Research on the Cavitation Suppression in the Water Hydraulic Throttle Valve

[+] Author and Article Information
Shi Weijie

School of Mechanical Science and Engineering,
Huazhong University of Science and Technology,
1037 Luoyu Road,
Wuhan 430074, China
e-mail: swajie123@163.com

Cao Shuping

School of Mechanical Science and Engineering,
Huazhong University of Science and Technology,
1037 Luoyu Road,
Wuhan 430074, China
e-mail: shupingcao@163.com

Luo Xiaohui

School of Mechanical Science and Engineering,
Huazhong University of Science and Technology,
1037 Luoyu Road,
Wuhan 430074, China
e-mail: luoxiaohui0188@163.com

Zhang Zuti

School of Mechanical Science and Engineering,
Huazhong University of Science and Technology,
1037 Luoyu Road,
Wuhan 430074, China
e-mail: afanti_2012@hotmail.com

Zhu Yuquan

School of Mechanical Science and Engineering,
Huazhong University of Science and Technology,
1037 Luoyu Road,
Wuhan 430074, China
e-mail: zhuyq@hust.edu.cn

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received May 7, 2016; final manuscript received July 15, 2017; published online August 23, 2017. Editor: Young W. Kwon.

J. Pressure Vessel Technol 139(5), 051302 (Aug 23, 2017) (9 pages) Paper No: PVT-16-1074; doi: 10.1115/1.4037443 History: Received May 07, 2016; Revised July 15, 2017

A water hydraulic throttle valve is often used to control the water flow in piping systems. When the water flows through the valve port, cavitation occurs frequently because of the high pressure drop across the valve. The cavitation can lead to wear, vibration and noise. To solve the problem, a modified throttle valve with a drainage device is proposed to suppress the cavitation. A contrasting test was conducted to analyze the effect of drainage device on the cavitation suppression. For evaluating the influence of inlet pressure and outlet pressure on the ability of the drainage device to suppress cavitation, the power spectrum density (PSD), normalized intensity, and cavitation suppression coefficient (CSC) of dynamic pressure are introduced. The results indicate that adopting the drainage device is a feasible method to suppress cavitation. In addition, the inlet pressure and outlet pressure have a great influence on the capacity for cavitation suppression of the drainage device (CCSDD) by changing the intensity of cavitation. When the inlet pressure is at 4.0 MPa, the cavitation is generated and the CCSDD is weak. With increasing inlet pressure, the intensity of cavitation and CCSDD is gradually enhanced. But when the inlet pressure increases to 7.0 MPa, the cavitation is saturated and the cavitation suppression by the drainage device begins to decrease. On the other hand, the effect of cavitation suppression decreases significantly when the outlet pressure increases from 1.4 MPa to 3.8 MPa.

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Figures

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Fig. 1

A throttle valve with drainage device: (a) structure of a modified throttle and (b) picture of drainage device

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Fig. 2

Schematic diagram of cavitation suppression test

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Fig. 3

Test rig of cavitation suppression

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Fig. 4

PSD of dynamic pressure without the drainage device: (a) Pinlet = 3.0 MPa and (b) Pinlet = 4.0 MPa

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Fig. 5

Normalized intensity for dynamic pressure at different inlet pressure

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Fig. 6

Effect of drainage device on the cavitation (Pinlet = 8.0 MPa, Poutlet = 1.0 MPa): (a) Global view of PSD, (b) partial enlarged view of PSD, and (c) normalized intensity

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Fig. 7

PSD and normalized intensity for the dynamic as function of frequency at different inlet pressure: (a) Pinlet = 4.0 Mpa, (b) Pinlet = 5.0 Mpa, (c) Pinlet = 6.0 Mpa, (d) Pinlet = 7.0 Mpa, (e) Pinlet = 8.0 Mpa, and (f) Pinlet = 9.0 Mpa

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Fig. 8

CSC curve at different inlet pressure

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Fig. 9

PSD and normalized intensity for the dynamic as function of frequency at different outlet pressure: (a) Pinlet = 1.4 Mpa, (b) Pinlet = 2.0 Mpa, (c) Pinlet = 2.4 Mpa, (d) Pinlet = 2.8 Mpa, (e) Pinlet = 3.4 Mpa, and (f) Pinlet = 3.8 Mpa

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Fig. 10

CSC curve at different outlet pressure

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