摘要
基于在不同射流角(10°,27.5°,45°,90°)和动量比下(0.1MPa,0.46MPa)对音速次膨胀射流通过菱形口喷射到马赫5横穿主流的实验及圆形射流器的对比实验,研究了次膨胀射流与超音横穿主流相互作用流场。结果表明在低射流角和动压比下相互作用激波保持附着,脱体激波产生lambda激波,lambda激波出现于高射流角、动压比下和圆形喷射器情况。射流外边界高度在射流进入主流过程中不断增加,而且在大射流角下较大。由于侧向扩展,羽流变窄,但圆形喷射器无此变化,接近喷射口的紊流卷吸结构大小随入射角增大,穿透量随喷射角和动压比的增加而增大,在近场圆形喷射器的穿透量超过菱形喷射器,但菱形喷射器的下游穿透量会超过圆形喷射器。
The sonic air injection through diamond shaped orifices at different incidence angles (10, 27.5, 45 and 90°) and total pressures (0.10 and 0.46 MPa) in a Mach 5.0 freestream is studied experimentally. A 90( circular injector, with the same exit port area and total pressures, is examined for comparison. The objective of the present study was to obtain the jet flow and shock structure using shadowgraph photography, Mie-scattering flow visualization. The results indicate that the interaction shock wave retained attaches at smaller incidence angle and lower injection pressure. The detached shock creates lambda shock, and lambda shocks are presented at higher incidence angle cases and circular injector. The height of the jet outer edge increases during the jet turning into the main flow, and is larger at larger jet incidence angles. The jet plume narrowes due to the plume spreading more in the lateral direction, and is absent for the circular injector. The entrainment size is observed to increase with increasing incidence angle. The penetration increases at larger incidence angles and higher jet momentum ratios. The penetration for the circular injectors exceed that of the 90° diamond injectors in the near field. The downstream penetration for the 90° diamond injectors exceeds that of the circular injectors.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2004年第9期115-118,128,共5页
Journal of Chongqing University
关键词
射流
横穿主流中的射流
相互作用激波
旋涡
混合
diamond injector
jet in cross flow
interaction shock wave
vortices
mixing
