导流块深度对楔形空腔内激波聚焦过程的影响  

Impact of depth of deflector on shock wave focusing processes in wedge-shaped cavity

作　　者：陈鑫[1,2] 谭胜 王育虔[1] 何立明[1] 朱晓彬[1] 王川[1] 

机构地区：[1]空军工程大学航空航天工程学院,西安710038 [2]先进航空发动机协同创新中心,北京100191

出　　处：《航空动力学报》2017年第10期2321-2329,共9页Journal of Aerospace Power

基　　金：国家自然科学基金青年科学基金(51106178)

摘　　要：为研究导流块深度对楔形空腔内径向入射激波聚焦过程的影响,对导流块深度分别为0、5、10、15mm的楔形空腔内激波聚焦的过程开展了实验和数值模拟研究。用高速CCD(charge coupled device)拍摄了楔形空腔中气流流动的纹影照片,用动态压力传感器测量了聚焦过程中流场的压力变化,并用高精度的数值方法对该过程进行了数值模拟研究。通过比较不同导流块深度下激波反射聚焦的过程发现:导流块深度越深,前导激波和压缩波两者聚焦的时间间隔越小,因此增大了激波聚焦的强度和空腔底部的压力峰值。导流块深度会影响二次激波形成的时间和发展程度,从而影响激波聚焦过程中楔形空腔内流场的紊乱程度。In order to obtain the influence of the depth of deflector on the process of shock wave focusing in a wedge-shaped cavity,tests and numerical simulation studies were carried out to investigate shock focusing on a test section where the depth of deflector was 0,5,10,15 mm.CCD（charge coupled device）camera was used to obtain the schlieren photos of the flow field.Pressure sensors were used to record the pressure histories.The numerical simulation of the process was carried out by using the numerical method with high accuracy.The shock wave focusing processes of different deflectors were compared.Result showed that,with the increase of depth,the time between leading shock focusing and compressional wave focusing decreased.Because of that,the strength of shock wave focusing and the peak of pressure in bottom of cavity increased.The depth of deflector can determine the formingtime of secondary shock and its degree of development,and then influence the disorder degree of the flow field during the shock wave focusing process.

关 键 词：两级脉冲爆震发动机(PDE) 激波聚焦 楔形空腔 导流块深度 径向入射 

分 类 号：V231.22[航空宇航科学与技术—航空宇航推进理论与工程]