Experimental and numerical investigation of flow field characteristics in a U-shaped throttle valve

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (20) : 284-290.

HE Jie1, LIU Xiumei2, LI Beibei2, DAI Zhenzhen2, QIAO Shuyun1, HONG Conghua2

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Abstract

The control accuracy and stability of the hydraulic control valve depend on the in-depth study of the flow field characteristics in a throttle valve. Based on the Schnerr-Sauer cavitation model and the standard k-ε turbulence model, the cavitation flow in a U-shaped throttle valve is obtained numerically. A visualization test rig is built, the cavitation flow in the transparent throttle valve is captured by a high-speed camera. The flow field characteristics of oil flow through the orifice of the U-shaped throttle valve and its influencing factors are studied by combining experimental and numerical methods, and the conclusions are as follows: the main pressure drop happens at the throttle orifice, and the flow changes from the contraction flow to the diffusion flow. The throttle orifice is the main area where cavitation occurs. The cavitation bubbles are stable and locate at the outlet of the throttle groove with a certain angle, whose shape are long and narrow. With the decreasing pressure difference, the cavitation intensity in the U-shaped throttle valve is reduced, and the cavitation bubble is shrunk towards the orifice. With the increasing the opening degree, the cavitation flow gradually changes from a mass to a slender shape, and the cavitation intensity increase firstly and then decreases gradually. Furthermore, the depth of the first groove is one of the main factors which affects the cavitation flow in the U-shaped throttle valve. When the groove depth decreases, the resistance in the notch increases. The pressure recovery would be speed up, and the cavitation area and the cavitation intensity will also be weakening. With decreasing depth of the groove, the range of high-speed flow becomes smaller, and the cavitation area also decreases. The decreasing groove depth is an effective method to inhibit the occurrence of cavitation.
Key words：U-shaped throttle valve; cavitation; pressure differential; opening; the depth of the groove

Key words

U-shaped throttle valve / cavitation / pressure differential / opening / the depth of the groove

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HE Jie1, LIU Xiumei2, LI Beibei2, DAI Zhenzhen2, QIAO Shuyun1, HONG Conghua2. Experimental and numerical investigation of flow field characteristics in a U-shaped throttle valve[J]. Journal of Vibration and Shock, 2022, 41(20): 284-290

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