混合与扩散同时进行的环形引射系统引射性能实验研究

THE EXPERIMENTAL EVALUATION OF ANNULAREJ ECTOR SYSTEM UNDER CONCURRENT MIXING AND DIFFUSION

本文设计了“混合与扩散同时进行”的环形引射系统,并结合其驱动引射式风洞,实验探讨了该系统的参数影响规律及混合特性,结果表明,引射器系统采取“同时混合扩散”方式可达到与传统的“等截面混合后再扩散”的方式相当的性能,但新方式下则大大缩短了系统结构尺寸,因而具有重要的实用意义。实验表明“同时混合扩散”方式只宜于应用在具有周向喷流特点的系统中,同时混合扩散角应与常规扩散角相当(β=6°)。研究表明,讨论喷流马赫数Ma_j对性能的影响应与面积比A_2/A_*的变化独立开来,Mα_j变化对性能的影响不超过10％,而面积比变化对性能的影响十分显著,在面积比与膨胀比适当的配合下,可获得较高的系统效率。

An experimental study of the effect of concurrent mixing and diffusion and other parameters on the perfermence of annular ejector system and of the Induction Driven Wind Tunnel (IDT) is presented. The results show that the concurrent mixing and diffusion can do very well as the traditional mixing duct can do. The length scale of the system is much shortened under the concurrent mixing and diffusion,but this can only be used in such injection as periphic jet. The best angle of concurrent mixing and diffusion is about 6 degree which is comparable to that of traditional diffuser. The area ratio A2/A* and the presure ratio P01/P02 affect the perfermence notably and oppositely, under the proper coordination of the two parameters, high perfermence of the IDT could be achieved. The effects of other parameters like jet Mach number and votex generator on the perfermence are also presented.