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| Experiment on air supplying position for improvement of jet pump cavitation performance |
1. School of Power and Mechanical Engineering, Wuhan University, Wuhan, Hubei 430072, China ; 2. Hubei Provincial Key Laboratory of Fluid Machinery and Power Engineering Equipment Technology, Wuhan, Hubei 430072, China; 3. Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China）
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Abstract Experiments on the cavitation performence by air supply method in jet pumps of area ratio 2.78 and 4.94 were carried out. The cavitation induced noise and vibration varied with air flow rate in different positions were measured under several cavitation conditions. The experimental results show that air supply in the throat tube under different cavitation conditions can decrease the cavitation noise and vibration. The greater the air-supply flow rate is, the more effective the noise and the axial vibration acceleration are reduced. The noise can be decreased by up to 5.1 dB and the maximum vibration reduction can reach to 4.3 m/s2. Air supply can improve the pressure distribution along the throat pipe, and damage the choke phenomenon which occurs in two-phase cavitating flow under limiting cavitaion conditions. Thus, the cavitation performance of water jet pump is improved. Air supply near and upstream the minimum pressure position in the throat pipe is more effective in inhibiting cavitation in a jet pump, and the optimal air-supply position is between 1 - 3 times the diameter of the throat pipe.
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2009, Vol. 30 
