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本文介绍了一种将多孔喷管代替常规的拉瓦尔喷管作为具有较大引射系数的超音速引射器主引射喷管的设计方法,並对这类超音速引射器的噪声及引射性能与以当量流量拉瓦尔喷管作为主引射喷管的参考引射器的噪声和引射性能进行了对比实验。 实验结果表明,在孔距比和轴距比一定的条件下,多孔喷管引射器具有最佳的引射性能。最佳引射性能的多孔喷管引射器与参考引射器相比,在具有中等和较短混合室长度比时,不仅噪声可显著降低且引射性能亦可得到提高。多孔喷管引射器引射系数达到最大值时,混合室长度要比参考引射器对应该引射系数时的混合室长度小得多。因此采用设计适当的多孔喷管作为具有较大引射系数的超音迷引射器的主引射喷管,效益十分显著。本文研究结果对于设计未来运输机动力装置的低噪声引射推力喷管亦有一定参考意义。
This paper presents a design method of replacing the conventional Laval nozzle with the main nozzle of a supersonic ejector with a larger ejecting coefficient. The noise and The ejecting performance was compared with that of the reference ejector using the equivalent flow Laval nozzle as the main ejector. The experimental results show that the multi-hole nozzle ejector has the best ejecting performance under the condition of a certain ratio of the hole-to-hole ratio and the wheelbase ratio. Optimized Ejection Performance Compared to a reference ejector, a porous nozzle ejector with optimal ejector performance not only reduces noise but also improves ejecting performance with medium and short mixing chamber length ratios. When the ejector coefficient of the multi-hole nozzle ejector reaches a maximum value, the length of the mixing chamber is much smaller than the length of the mixing chamber when the reference ejector corresponds to the ejector coefficient. Therefore, the use of properly designed porous nozzle as a larger ejector ultrasonic ejector of the main nozzle, the effect is very significant. The results of this paper are also of some reference significance for the design of low noise jet thrusters for the future transport of power units.