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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental investigation about the second-mode waves in hypersonic boundary layer over a cone at small angle of attack
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Experimental investigation about the second-mode waves in hypersonic boundary layer over a cone at small angle of attack

机译：小攻角锥在锥上过度边界层第二模波的实验研究

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摘要

An experiment investigating the second-mode instability on the sharp cone with a small angle of attack has been conducted. The fine structure in the boundary layer has been visualized by the Nano-tracer-based Planar Laser Scattering(NPLS) technique. The "rope-like" second-mode waves are found to still be the dominant structures before the transition of the boundary layer at 1 degrees angle of attack and the leeside-forward and windside-aft of the transition have also been verified. The propagation velocity of the second-mode waves on the leeward side increases obviously as the disturbance evolving downstream. The development of the disturbance has been analyzed through the wall-fluctuation pressure. The amplification of amplitude is nonmonotonic along the circumferential direction and the M-factor patterns indicated that the disturbance development is delayed in three indentation regions: 55 degrees <= phi <= 65 degrees , 85 degrees <= phi <= 95 degrees and 130 degrees <= phi <= 140 degrees.
机译：已经进行了对具有小攻角攻击尖锐锥上的第二模式不稳定性的实验。边界层中的细结构已经通过基于纳米示踪基的平面激光散射（NPLS）技术而可视化。发现“绳索”的第二模式波仍然是在1度迎角的边界层过渡之前的主导结构，并且还已经验证了过渡的腰部前进和风向除尘。随着下游的扰动，后向侧的第二模式波的传播速度显然增加了显然。通过壁波动压力分析了扰动的发展。振幅的放大是沿圆周方向的非调调性，并且M系子图案表明干扰发育在三个压痕区域中延迟：55度<= PHI <= 65度，85度<= PHI <= 95度和130度<= phi <= 140度。

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