摘要
环形射流泵被吸流体流道相对通畅,但当流量比降低至临界流量比时,吸入室内会形成回流区域,该区域甚至会扩展至喉管内,对泵的性能及内部流动状态产生较大影响。本文通过数值仿真的方法,主要研究吸入角对回流的位置、尺寸及形成过程。随着流量比增加,回流尺寸不断减小,分离点不断远离喷嘴出口而再附点的位置几乎没有变化。当流量比增加至临界流量比时,回流会消失。通过对不同吸入角度回流区域发展过程进行比较发现,吸入室对回流存在限制和挤压的作用,进而导致临界流量比的变化。当吸入角度处于18°至25°之间时,吸入室对回流区域的抑制作用达到最佳,临界流量比达到最小。此时继续增大吸入角至30°,并不能有效的抑制回流的形成,反而会使回流扩展至喉管。
The secondary flow in annular jet pump(AJP)tends to be more unobstructed.However,when the flow rate ratio(q)declines to a critical value,the recirculation zone emerges in the center part of the suction chamber and even extends into the throat,which exerts greater impact on the pump performance and internal flow state.The influence of the suction angle(α)on the location,size and formation of the recirculation in AJP was mainly investigated in this paper.As the flow rate ratio q increases,the size of the recirculation decreases gradually,and the separation point of the recirculation moves away from the nozzle exit while the location of the reattachment point almost does not change.When q increases to a critical value,the recirculation disappears.Through comparison of the recirculation development at different suction angleα,it was found that the suction chamber could limit and squeeze the recirculation and cause the variation of the critical flow rate ratio qc.When 18°≤α≤25°,the suppression effect of the suction chamber on the recirculation zone was best,and the critical flow rate ratio was smallest.At this time,the formation of recirculation could not be effectively suppressed by continuously increasing the suction angle to 30°.On the contrary,it would make the recirculation extend to the throat.
作者
肖龙洲
蔡标华
胡洋
Xiao Longzhou;Cai Biaohua;Hu Yang(Wuhan Second Ship Design and Research Institute,Wuhan 430205,China)
出处
《流体机械》
CSCD
北大核心
2020年第2期48-52,共5页
Fluid Machinery
关键词
环形射流泵
回流
射流
吸入角度
annular jet pump
recirculation
jet
suction angle
