流体喉部横流喷嘴的雾化特性

Atomization characteristics of cross-flow injector in the fluidic nozzle throat

为了研究横流喷嘴的雾化效果以及对发动机推力的影响,采用互击式直流喷嘴、逆向式直流喷嘴和水平式直流喷嘴进行了冷流试验.研究了不同试验工况下喷管出口喷雾场雾滴的索太尔平均直径与发动机的推力特性.研究结果表明:随着压比的增加,雾滴直径减小;相同的压比下,雾滴直径最小的喷射方案为喉扩喷射,雾化质量最好的喷嘴为互击式直流喷嘴;同时在喉扩喷射方案下,3种喷嘴的扼喉能力与推力比随着流量比的增加而提高.

In order to study atomization effects of the cross-flow injector and the influence on engine thrust,a series of cold-flow tests were performed using impinging injector,reverse injector and horizontal injector.The Sauter mean diameter of droplet in spray field at the exit of engine nozzle and thrust characteristics of engine were studied at different test cases.The test results indicate that with the increase of pressure ratio,the droplet diameter decreases;the injection case of the minimal droplet diameter is the throat and expanding section injection when the pressure ratio is given,and the injector of the best atomization quality is the impinging injector;meanwhile,the ability to control the throat and thrust ratio for three kinds of injectors increases with the increasing mass flow ratio under the throat and expanding section injection.