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| Working mechanism and exhausting characteristics of mini-exhaust valve |
| Wu Dazhuan1,2, Liu Qiaoling1,2, Lai Zhounian1,2, Wang Leqin1,2 |
| 1.Institute of Chemical Machinery, Zhejiang University, Hangzhou, Zhejiang 310027, China; 2.Engineering Research Center of High Pressure Process Equipment and Safety of Ministry of Education, Zhejiang University, Hangzhou, Zhejiang 310027, China |
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Abstract To study the working mechanism and exhaust characteristics and establish a theoretical base for performance prediction and design optimization of a mini-exhaust valve, CFD simulations were carried out to obtain the exhaust characteristics and internal flow field, and then they were verified with experiment. The model of whole flow passage was established and 3D flow field in it was calculated, the flow field structures, closing pressure, pressure and velocity distributions in the valve were presented when the valve discharges air and oil, respectively. The influences of valve position on ball lift and passage size on closing pressure were analyzed. A comparison of CFD simulation results and those gi-ven by general analytical formula was made. A test device was established to measure the closing pressure in oil and air exhausting conditions. The results showed that the CFD predicted closing pressure is consistent with experimental observation. The pressure estimated by the analytical formula is different from the CFD prediction under oil exhausting condition. However, agreement in the closing pressure between CFD and analytical formula is good in air exhausting condition. The closing pressure in an enlarged model of the valve passage remains the same as the original valve. The CFD simulation method and its results can be applicable in design and optimization of min-exhaust valve.
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Received: 06 December 2012
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