高压降控制阀内空化流动特性实验与数值研究OACSTPCD

Control valves under high pressure drop working conditions prevalently have some problems such as severe cavitation,high energy consumption,vibration and noise.The method of combining experimental research with LES numerical study was adopted to study the cavitation flow characteristics in the control valve.The flow details were captured,the flow energy transfer and loss characteristics at different cavity evolution stages were studied,and the influence of different operating conditions on the valve flow capacity was analyzed.The results showed that the degree of cavitation in the valve seat throat and the expansion section area is relatively higher.Under cavitation flow conditions,the total mechanical energy loss is composed of local throttling energy loss and additional cavitation energy loss.As the pressure drop increases,the proportion of cavitation additional flow resistance in the total flow resistance gradually increases from 5.3％to 26.7％.The cavitation additional flow resistance increases with the degree of cavitation,resulting in an increase in the total flow resistance and a decrease in the flow capacity.