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首页> 外文期刊>Journal of Aerospace Sciences and Technologies >EXPERIMENTAL INVESTIGATION OF FLOW PARAMETERS IN A MILD CURVED S-SHAPED DIFFUSING DUCT
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EXPERIMENTAL INVESTIGATION OF FLOW PARAMETERS IN A MILD CURVED S-SHAPED DIFFUSING DUCT

机译：温和弯曲的S形扩散管中流动参数的实验研究

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The paper presents a detailed study of the performance of fully developed subsonic turbulent flow in a circular cross-section S-shaped centerline-diffusing duct. A precalibrated 5-hole pressure probe was used for the measurements. The diffuser cross-section was expanded to 2.25 area ratio (A_r) at the exit. The duct was fabricated by joining two 22.5° bends of curvature ratio (β_t) 11.46 in reverse direction with a centerline offset of 0.2 of the axial length of the diffuser. The test was carried out with inlet R_e = 8.4 x 10~5 , calculated based on diffuser inlet diameter. The experimental results indicated the generation of secondary flow in the form of a pair of counter rotating vortices in the first half, which changes its senses of rotation in the second half. The overall static pressure recovery of the diffuser was 40%.
机译：本文对圆形截面S形中心线扩散导管中完全发展的亚音速湍流的性能进行了详细研究。使用预先校准的5孔压力探头进行测量。扩散器的横截面在出口处扩大到2.25面积比（A_r）。通过将两个曲率比（β_t）11.46的22.5°弯头反向连接，中心线偏移为扩散器轴向长度的0.2来制造管道。测试是根据扩散器进口直径计算的进口R_e = 8.4 x 10〜5进行的。实验结果表明，在上半部分以一对反向旋转涡流的形式产生了二次流，从而在下半部分改变了其旋转方向。扩散器的总静压恢复率为40％。

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