Control of Unsteady Aerodynamic Loads Using Adaptive Blowing
Control of Unsteady Aerodynamic Loads Using Adaptive Blowing
复制标题
使用自适应吹风控制不稳定空气动力载荷
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
D. Greenblatt
中科院分区：
文献类型：
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作者：
Hanns Mueller;C. Nayeri;C. Paschereit;D. Greenblatt
在 NACA 0018 翼型模型上对自适应槽吹进行了实验研究，作为最小化不稳定空气动力载荷的方法。测试是在专门设计用于促进高振幅风速波动的风洞设施中进行的。最初，在准静态条件下研究了位于前缘附近的控制槽的稳定吹气的效果。在雷诺数范围从 1.5·10 到 5·10 时，在较宽的攻角范围内获得了 Δcl ≈ 0.5 的升力相对变化。考虑了各种动态测试案例，包括俯仰运动、风洞速度的正弦变化以及两者的组合。通过以中等动量系数吹气可以抑制动态失速涡流的形成。动态调整动量系数有效地抵消了不稳定流入条件引起的升力波动，并且在所有测试案例中都获得了几乎恒定的升力。此外，控制显着减少了所有动态俯仰实验中的力矩偏移。
Adaptive slot blowing was experimentally investigated on a NACA 0018 airfoil model as a method to minimize unsteady aerodynamic loads. Tests were conducted in a wind tunnel facility specifically designed to facilitate high amplitude wind speed fluctuations. Initially, the effect of steady blowing from a control slot located near the leading-edge was investigated under quasistatic conditions. At Reynolds numbers ranging from 1.5·10 to 5·10, a relative change in lift of ∆cl ≈ 0.5 was obtained over a wide range of angles of attack. Various dynamic test cases including a pitching motion, a sinusoidal variation of the wind tunnel speed and a combination of both were considered. The formation of the dynamic stall vortex was suppressed with blowing at moderate momentum coefficients. Dynamically adapting the momentum coefficient effectively counteracted the lift fluctuations resulting from the unsteady inflow conditions and virtually constant lift was obtained in all test cases. Furthermore, control significantly reduced the moment excursions in all dynamic pitching experiments.