二维凹面腔内连续超声速射流入射压力对激波聚焦的影响  

Effects of Continuous Supersonic Jet Pressure on Shock Focus in Two-Dimensional Concave Cavity

作　　者：赵坤[1] 何立明[1] 曾昊[1] 刘圣平 ZHAO Kun;HE Li-ming;ZENG Hao;LIU Sheng-ping(College of Aeronautics Engineering,Air Force Engineering University,Xi＇an 710038,China)

机构地区：[1]空军工程大学航空工程学院,陕西西安710038

出　　处：《推进技术》2018年第7期1479-1485,共7页Journal of Propulsion Technology

基　　金：国家自然科学基金(91541109;51406234);陕西省自然科学基金(2015JQ5124)

摘　　要：为研究射流入射压力对连续超声速射流对撞诱导激波聚焦的影响,开展了二维凹面腔内连续超声速射流对撞诱导激波聚焦的实验,分析了流场演化过程及动态压力特性。结果表明:连续超声速射流在凹面腔内对撞后出现了水平拉锯脉动模态和上下交叉脉动模态,在水平拉锯脉动模态中能实现频率为9k Hz左右的激波聚焦,实质是凹面腔内的气流周期性排出后形成的低压区导致射流喷管出口形成前导激波并在凹面腔底部聚焦;射流入射压力越小,凹面腔底部和射流对撞位置的压力脉动幅值越小,凹面腔底部激波聚焦的频率和强度越小,当入射压力减小到0.3MPa后,凹面腔内无法实现激波聚焦。In order to research the effects of continuous supersonic jet pressure on the shock focus,experiment of shock focus induced by continuous supersonic jet collision in two-dimensional concave cavity was carried out and the changes of flow field and characteristics of dynamic pressure were analyzed. The results show that horizontal seesaw pulsation modal and up-down cross pulsation modal appear after continuous supersonic jet collision in two-dimensional concave cavity,and shock focus with the frequency of about 9 kHz can appear in horizontal seesaw pulsation modal,the substance is that the leading shock waves,which are induced at the jet nozzle outlet when flow exhaust from the concave cavity,focus at the bottom of the concave cavity. The pulsation amplitude of pressure at the bottom of the concave cavity and the jet collision area and the strength and frequency of shock focus at the bottom of the concave cavity decrease as the jet pressure decreases,shock focus can not appear in the concave cavity when the jet pressure decreases to 0.3 MPa.

关 键 词：连续超声速射流 激波聚焦 入射压力 纹影 动态压力 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]