Unsteady actuation of counter-flowing wall jets for gust load attenuation

Unsteady actuation of counter-flowing wall jets for gust load attenuation
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用于衰减阵风载荷的逆流壁射流的不稳定驱动

DOI:
10.1016/j.ast.2019.03.053
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发表时间:
2019
影响因子:
5.6
通讯作者:
Al-Battal N
Al-Battal N
中科院分区:
工程技术1区
文献类型:
--
作者:
Al-Battal N

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本文研究了在翼型上表面激励的逆流附壁射流对突风的控制作用。对于周期性和瞬态驱动,相位平均升力和粒子图像测速测量NACA 0012翼型,在雷诺数为660,000,为一系列的减少频率和三个射流位置,x J/c= 0.08,0.60和0.95。对于周期激励,随着折合频率的增加,升力振荡的振幅减小,相位延迟增大。对于靠近前缘的吹除位置和随着攻角的增大,折减频率对振幅和相位的影响更为显著。瞬态激励揭示了分离流的缓慢响应,因此也揭示了升力的缓慢响应,对于前缘附近的吹气,延迟变得更加明显。估计的时间常数类似于以前的观察强迫分离和再附着。
Counter-flowing wall jets actuated on the upper surface of an airfoil are investigated for the purpose of controlling gust encounters. For periodic and transient actuations, phase-averaged lift force and particle image velocimetry measurements are presented for a NACA 0012 airfoil, at a Reynolds number of 660,000, for a range of reduced frequencies and three jet locations, x J/c= 0.08, 0.60 and 0.95. For periodic actuation, amplitude of lift oscillations decrease and phase delay increase with increasing reduced frequency. The effect of reduced frequency on the amplitude and phase is more significant for blowing locations near the leading-edge and with increasing angle of attack. Transient actuation reveals the slow response of the separated flow, and therefore lift, with the delay becoming more pronounced for blowing near the leading-edge. Estimated time constants are similar to previous observations for forced separation and reattachment.
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