解少飞, 宫建, 高波, 杨学军, 沈清. 边界层转捩与压缩拐角分离流动的非定常作用[J]. 空气动力学学报, 2017, 35(1): 129-135. DOI: 10.7638/kqdlxxb-2015.0104
引用本文: 解少飞, 宫建, 高波, 杨学军, 沈清. 边界层转捩与压缩拐角分离流动的非定常作用[J]. 空气动力学学报, 2017, 35(1): 129-135. DOI: 10.7638/kqdlxxb-2015.0104
Xie Shaofei, Gong Jian, Gao Bo, Yang Xuejun, Shen Qing. Unsteady interaction between transitional boundary layer and flow separation in compression corner[J]. ACTA AERODYNAMICA SINICA, 2017, 35(1): 129-135. DOI: 10.7638/kqdlxxb-2015.0104
Citation: Xie Shaofei, Gong Jian, Gao Bo, Yang Xuejun, Shen Qing. Unsteady interaction between transitional boundary layer and flow separation in compression corner[J]. ACTA AERODYNAMICA SINICA, 2017, 35(1): 129-135. DOI: 10.7638/kqdlxxb-2015.0104

边界层转捩与压缩拐角分离流动的非定常作用

Unsteady interaction between transitional boundary layer and flow separation in compression corner

  • 摘要: 为了认识激波与转捩边界层之间的相互作用,选取压缩拐角模型为研究对象,在高超声速风洞中开展了激波/转捩边界层干扰试验研究。试验在FD-20炮风洞中进行,试验马赫数为8,雷诺数0.5×107~2×107/m。试验采用了薄膜电阻温度计和常规压力传感器,分别测量压缩拐角周围的热流和压力分布。根据干扰区上下游的边界层流态,将试验分为两部分:层流/湍流干扰和转捩/湍流干扰。对比分析了边界层转捩发生在干扰区时的热流分布、压力分布以及脉动热流的非定常特性。研究结果表明,激波/转捩边界层干扰的热流和压力分布特征,不同于常规的层流干扰和湍流干扰,其介于二者之间。层流/湍流干扰的热流和压力分布特征类似于层流干扰;转捩/湍流干扰的热流和压力分布特征类似于湍流干扰。互双谱分析结果表明,当边界层转捩发生在分离区时,转捩脉动与分离泡脉动同时出现并增长。当两者幅值足够大时,转捩脉动会与分离泡脉动发生非线性耦合作用。这种耦合作用会诱导出新的频率特征的脉动结构,从而使分离区内的脉动量显著增加。

     

    Abstract: The experiments of shock wave/transitional boundary layer interaction were performed in FD-20 wind tunnel to study the interactions between shock wave and transitional boundary layer. The experimental model was compression corner. The Mach number is 8, and the Reynolds number 0.5×107~2×107/m. Film resistance thermometers and pressure sensors were used in the experiments to measure the distributions of the heat flux and the pressure. According to the state of boundary layer in the upstream and downstream of the separation region, the experiment was divided into laminar/turbulence interference part and transition/turbulence interference part. The distributions of parameters and unsteady characteristics of heat flux fluctuations were compared in separation region where transition occurred. The experimental results show that the characteristics of the distributions of transitional interaction are different from those of the turbulence interaction and the laminar interaction. Cross-bispectrum analysis shows that the transitional fluctuations and the separation bubble fluctuations appear and grow simultaneously with the boundary layer transition occurring in separation region. The transitional fluctuations may interact with the separation bubble fluctuations nonlinearly, when the amplitudes of the both fluctuations are large enough. The fluctuation structures with new frequency characteristics are induced, leading to remarkable increment of the amplitudes of the fluctuations.

     

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