Study on transient opening and closing performance of one-way ball valve in oil-gas multiphase reciprocating pump
ZHANG He1*, ZHANG Huajun2, ZHANG Shengchang3
1. Hangzhou Shengwei Technology Co. Ltd., Hangzhou, Zhejiang 310000, China; 2. Hangzhou Special Equipment Inspection and Research Institue, Hangzhou, Zhejiang 310051, China; 3. College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310000, China
Abstract：The transient opening and closing processes and reciprocating motion characteristics of the one-way ball valve in the 3DP-60/3.0 type oil-gas multiphase reciprocating pump were simulated by using user-defined functions(UDF)and dynamic mesh model in Fluent to investigate the influence of different parameters on hysteresis in the processes under variable flow conditions. The opening height-time function of the valve was involved in a UDF and the inlet fluid velocity, static pressure and kinetic energy loss under two limit conditions of opening and closing moments were focused. The influences of inlet flow rate, opening height and gas content on the pressure field and gas-liquid two-phase volumetric fraction distribution in the valve were revealed. Experimental data were compared with simulated results to verify the reliability of numerical simulations. The results show that the pressure drop across the valve rises with increasing inlet flow rate whether under pure liquid or low gas content two-phase flow condition, particularly with a more uniform increment. The inlet pressure difference gradually decreases when the opening height increases to 6 mm from 2 mm, presenting a decreasing trend with the gas content being 80%, 60% and 40%, respectively. When the gas content is reduced to 0%(pure liquid condition)from 20%, the smaller the opening height is, the greater the inlet pressure varies, showing a gradual phase separation on the valve surface and a larger interfacial pressure difference. The decrease of pressure drop across the valve is very significant as the gas content varies from 0% to 90%, especially, the pressure drop decreases steadily with further increasing gas content.
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