关键词: 节流阀口, 空化表征, 特性曲线, 体积流量

Abstract:

The cavitation characterization of two stage throttle port was studied,and using classical cavitation definition σ,new-form cavitation characterization index  was obtained,which was applicable,to two stage throttle port.In the calculation formulae of new-form  cavitation  characterization index,all design parameters needed by two-stage throttle port  were included.Applying the calculation formule,cavitation characterization curves of  U  and  V  throttle ports were plotted,and it is observed from the plots that whether U or V throttle port, cavitation concentration region is always around section A2,and that the cavitation characterization index of section A2  when liquid flows into section A1  is always larger than that of  A2 when liquid flows out from section A1;the macroscopic phenomena is that flow rates of different flow directions are different, and also flow rate out of section A1  is  larger   than that of  flow rate into section A1.

Key words: throttle , port;cavitation characterization;cavitation curve;flow rate of volume