Numerical analysis of shock wave and supersonic turbulent boundary interaction between adiabatic and cold walls
Numerical analysis of shock wave and supersonic turbulent boundary interaction between adiabatic and cold walls
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DOI：
10.1080/14685248.2017.1311017
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发表时间：
2017-04
影响因子：
1.9
通讯作者：
Fu-lin Tong;Zhigong Tang;Changping Yu;Xingkun Zhu;Xinliang Li
中科院分区：
文献类型：
--
作者：
Fu-lin Tong;Zhigong Tang;Changping Yu;Xingkun Zhu;Xinliang Li
摘要 对绝热和冷壁温度下 24° 压缩坡道中的冲击波和超音速湍流边界层相互作用进行了直接数值模拟。研究了壁温对湍流结构和冲击运动的影响。结果根据之前的实验和数值数据进行了验证。分析了壁冷却对边界层特性的影响。统计数据表明，壁面冷却对相互作用区域下游的平均速度剖面的对数区域有显着影响。而且壁温对雷诺应力各向异性的影响主要局限于近壁区域，对外层变化不大。随着壁温降低，条纹的流向相干性增加。基于瞬时Lamb矢量散度分析，冷壁条件下小尺度涡之间的动量传递显着增强。此外，壁压信号的频谱分析表明，在冷情况下，低频能量峰值的位置向高频移动。此外，动态模式分解结果揭示了两种特征模式，即表现出分离气泡的呼吸运动的低频模式和与分离气泡上方的不稳定波传播相关的高频模式。动态模式的形状对壁温不敏感。
ABSTRACT Direct numerical simulations of shock wave and supersonic turbulent boundary layer interaction in a 24° compression ramp with adiabatic and cold-wall temperatures are conducted. The wall temperature effects on turbulence structures and shock motions are investigated. The results are validated against previous experimental and numerical data. The effects of wall cooling on boundary layer characteristics are analysed. Statistical data show that wall cooling has a significant effect on the logarithmic region of mean velocity profile downstream the interaction region. Moreover, the influence of wall temperature on Reynolds stress anisotropy is mainly limited in the near-wall region and has little change on the outer layer. As the wall temperature decreases, the streamwise coherency of streaks increases. Based on the analysis of instantaneous Lamb vector divergence, the momentum transport between small-scale vortices on cold-wall condition is significantly enhanced. In addition, spectral analysis of wall pressure signals indicates that the location of peak of low-frequency energy shifts toward higher frequencies in cold case. Furthermore, the dynamic mode decomposition results reveal two characteristic modes, namely a low-frequency mode exhibiting the breathing motion of separation bubble and a high-frequency mode associated with the propagation of instability waves above separation bubble. The shape of dynamic modes is not sensitive to wall temperature.