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本文介绍了小展弦比二元直壁亚音速扩压器内的湍流边界层特性.精确地测量了扩压器沿程几个截面上的平均速度分布、壁面摩擦系数C_f分布以及由此而得出的边界层积分参数.并指出C_f要比Ludwelg-Ti-Ilmann经验公式所计算的结果稍低,所以要对C_f稍作修正.文章还分析了逆压力梯度对湍流边界层内外区的壁面律与尾迹律的影响,并得出无因次压力梯度参数与尾流强度参数之间的关系曲线.
In this paper, we introduce the characteristics of turbulent boundary layer in a small aspect ratio BSTS subsonic subspace diffuser, and accurately measure the average velocity distribution, the Cf distribution of wall friction coefficient and the And points out that the C_f is slightly lower than the Ludwelg-Ti-Ilmann empirical formula, so C_f should be revised slightly.The paper also analyzed the effect of inverse pressure gradient on the wall of the inner and outer turbulent boundary layers Law and wake law, and draw the relationship between the dimensionless pressure gradient parameter and the wake strength parameter.