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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。
In this paper, we designed a ring-shaped injection system of “simultaneous mixing and diffusion”, and combined with its driving wind tunnel, the influence of the parameters and the mixing characteristics of the system were discussed experimentally. The results show that the ejector system adopts “Simultaneous Mixing Diffusion ”method can achieve the equivalent performance of the traditional method of“ equal-section mixing and then diffusion ”, but the new method greatly shortens the size of the system structure, which is of important practical significance. Experiments show that the “simultaneous mixed diffusion” method should only be applied to the system with the characteristics of a circumferential jet, and the mixed diffusion angle should be equal to the conventional diffusion angle (β = 6 °). The results show that the influence of the jet Mach number Ma_j on the performance should be independent of the change of the area ratio A_2 / A_ *. The change of Mα_j does not affect the performance more than 10%, while the effect of area ratio on the performance is very significant. Under the proper cooperation of area ratio and expansion ratio, higher system efficiency can be obtained.