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针对燃烧室的变工况需求,利用反压试验系统开展了Y型喷嘴变工况试验,获得了喷嘴在不同反压环境下的喷注刚性、平均流速及雾化质量。试验结果表明,在常压环境中,Y型喷嘴通过掺混气体的方式显著改善了低工况下的喷注刚性和雾化效果,喷嘴具有较宽的工况调节范围;在反压环境中,随着反压升高,掺混气体对提高低工况下喷嘴喷注刚性的作用减弱,然而受掺混气体的影响,喷嘴的平均流速和雾化质量明显改善,并且在不同流量工况下获得了良好的一致性。在模拟燃烧室工作时,Y型喷嘴在较宽的流量调节范围内都具有良好的喷注刚性和雾化质量,其有效的流量调节范围远大于直流喷嘴。
According to the requirement of changing the working conditions of the combustion chamber, a Y-shaped nozzle was tested under varying pressure to test the changing conditions of the nozzle. The injection rigidity, average velocity and atomization quality of the nozzle under different backpressure conditions were obtained. The experimental results show that in the atmospheric environment, Y-shaped nozzle can remarkably improve the injection rigidity and atomization effect under the low working condition by mixing the gas, and the nozzle has a wide adjustment range of working conditions. In the counter-pressure environment , With the backpressure increasing, the effect of the mixed gas on improving the nozzle injection rigidity under low working conditions is weakened. However, under the influence of the mixed gas, the average flow velocity and the atomization quality of the nozzle are obviously improved, and under different flow conditions Under the get a good consistency. The Y-type nozzle has good injection stiffness and atomization quality over a wide flow adjustment range when operating in an analogue combustor, and its effective flow adjustment range is much greater than that of a DC nozzle.