SIMULATION AND EXPERIMENT OF BUBBLY FLOW INSIDE THROTTLING GROOVE  

作　　者：FU Xin DU Xuewen ZOU Jun YANG Huayong JI Hong 

机构地区：[1]State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China [2]School of Fluid Power and Control Engineering, Lanzhou University of Technology, Lanzhou 730050. China

出　　处：《Chinese Journal of Mechanical Engineering》2007年第5期37-41,共5页中国机械工程学报（英文版）

基　　金：Selected from Proceedings of the 7th International Conference on Frontiers of DesignManufacturing(ICFDM'2006);This project is supported by National Basic Research Program of China(973 Program,No.2006CB705400);National Natural Science Foundation of China(No.50575200).

摘　　要：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 nressure level accordingly.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 nressure level accordingly.

关 键 词：Pressure distribution Throuling groove Valve Cavitation Noise 

分 类 号：TH16[机械工程—机械制造及自动化]