Impact of Alternating Trailing-Edge Noise on Buffet Flows
Impact of Alternating Trailing-Edge Noise on Buffet Flows
复制标题
交替后缘噪声对自助流的影响
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
W. Schroeder
中科院分区：
文献类型：
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作者：
A. Feldhusen;A. Hartmann;M. Klaas;W. Schroeder
应用高速PIV技术对超临界翼型模型的跨音速抖振流场进行了分析，并测量了定常和非定常表面压力。由于抖振的起源尚未完全了解，本研究旨在通过捕获翼型上方流场中的波传播来支持Lee给出的抖振机理模型。波的传播速度，从而获得相关的速度波动。特别注意的是声波从后缘发出。为了分析抖振现象，选择了M∞ = 0.73的自由飞行马赫数和α = 3.5 °的迎角，因为在这些条件下会发生明显的抖振。这项调查导致了有希望的结果，支持李的理论的有效性。
The transonic buffet flow over a supercritical DRA 2303 airfoil model is analyzed applying high-speed PIV as well as steady and unsteady surface pressure measurements. Since the origin of buffet is not fully understood yet, the present study aims at supporting the model of the buffet mechanism given by Lee by capturing the wave propagation in the flow field above the airfoil. The wave propagation speeds are thereby obtained by correlating the velocity fluctuations. Special attention is paid to the sound waves originating from the trailing edge. To analyze the buffet phenomenon a freestream Mach number of M∞ = 0.73 and an angle of attack of α = 3.5◦ are chosen since under these conditions distinct buffet occurs. The investigation led to promising results that support the validity of Lee’s theory.