The present work is devoted to the experimental study of a high-speed jet exhausting from a model dual-stream jet nozzle which was performed using non-contact (shadow visualization) and probing (Pitot pressure tube) methods for measuring gas-dynamic parameters. Azimuthal non-uniformity of the pressure distribution, whose magnitude in the external duct is much higher than that in the internal one, is revealed. The cause for the formation of the 3D flow structure is related to the supporting pylons installed inside the nozzle contours and with the formation of a transonic flow mode in the external duct.

中文翻译：

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从模型双流喷嘴喷出的高速射流的三维结构的形成

本工作致力于从模型双流喷嘴中抽出高速射流的实验研究，该实验是使用非接触式（阴影可视化）和探测（皮托管压力管）方法测量气体动力学参数来进行的。揭示了压力分布的方位角不均匀性，其外部管道的幅度远大于内部管道的幅度。形成3D流动结构的原因与安装在喷嘴轮廓内的支撑塔架以及在外部管道中形成跨音速流动模式有关。