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FU Xin
DU Xuewen
ZOU Jun
YANG Huayong
State Key Laboratory of Fluid Power
Transmission and Control,
Zhejiang University,
Hangzhou 310027, China
JI Hong
School of Fluid Power and
Control Engineering,
Lanzhou University of Technology,
Lanzhou 730050, China
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SIMULATION AND EXPERIMENT OF
BUBBLY FLOW INSIDE THROTTLING
GROOVE*
Abstract:
The relationship between pressure distribution and cavitation (noise) inside throttling groove is investigated by numerical simulation and experimental method. A valve pocket with several transducers is performed to detect the pressure distributions inside the valve chamber, and the results fit quite well with the computational fluid dynamics(CFD) analysis. High-speed imaging techniques are employed to investigate the cavitation
mechanisms, in particular bubble inception and cluster formation
near the throttling groove. A spectrum analyzer is used to
measure the sound pressure level of noise generated by the
bubble flow. It is found that the pressure distributions inside
the groove are sensitive to the valve port configuration and
back pressure. The pressure distribution determines the bubble
size and number passing through the valve grooves and the sound
pressure level of noise induced by collapsing bubbles. The inlet pressure mainly affects the saturation degree of bubbly flow inside the groove and the intensity of sound pressure level accordingly.
Key words:
Pressure distribution Throttling groove Valve Cavitation Noise |