带二次流的多喷管超声速引射器性能实验研究

为研究多喷管超声速引射器在有二次流情况下的性能，采用模拟器产生给定总温和总压的模拟二次流，在多喷管超声速引射器实验台上进行了一系列实验。重点考察了多喷管引射器的性能以及一次流总压和喷管安装构型对其性能的影响。实验结果表明：多喷管超声速引射器可保证二次流在设计工况下正常工作；二次流的加入大大减小了一次流的总压损失；较低的一次流总压具有更好的压力匹配性能，但引射增压能力也有所降低；合理的喷管安装构型可同时提高引射增压能力和压力匹配能力。提出了将二次流作为“助推器”，以帮助多喷管引射器在较低工况下实现启动的方案，在不增加系统复杂度的前提下提高了引射器的压力匹配能力。

Experimental investigation on performance of multi-nozzle supersonic ejector with secondary flow

An ejector test facility was established to investigate the performance of a multi-nozzle supersonic ejector with a secondary flow. Using the hot rocket exhaust gases as primary and simulated secondary driving fluids, wall static pressure distributions on the ejector were obtained. Emphases were laid on the reliability of the multi-nozzle ejector and the influence of the primary flow total pressure and nozzle assembling configurations on the performance of the ejector. Experimental results show that the pumping requirement of the simulated secondary flow can be satisfied by using the multi-nozzle supersonic ejector. With the secondary flow joined, the pressure losses can be reduced greatly, which almost corresponds to 15 percents of the primary flow total energy. The lower primary flow tot