Lift reduction by counter flowing wall jets

Lift reduction by counter flowing wall jets
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通过逆流壁射流减少升力

DOI:
10.1016/j.ast.2018.05.025
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发表时间:
2018
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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逆流壁射流被提出来减少极端载荷,从而实现更轻和更高效的飞机。通过力、压力和粒子图像测速测量研究了雷诺数为660,000的NACA 0012翼型上表面的上游吹气,发现比垂直于表面吹气更有效。靠近后缘的吹气位置对小迎角更有效;靠近前缘的吹气位置对大迎角更有效。在失速迎角下,当吹气位置为x J/c= 0.08时,升力系数的最大减小量为Δ C L=− 0.33,此时的最大流量系数(C Q= 0.44%)被测。即使对于完全分离的流动,后缘附近的上游吹气也会改变回流区,使剪切层向上偏转,从而导致升力减小。这比放在后缘附近的机械襟翼有显著的优点,因为机械襟翼留在分离流中而失去作用。
Counter flowing wall jets are proposed to reduce extreme loads, enabling lighter and more efficient aircraft. Upstream blowing on the upper surface of a NACA0012 airfoil at a Reynolds number of 660,000 was investigated by means of force, pressure and particle image velocimetry measurements, and was found to be more effective than blowing normal to the surface. Blowing locations near the trailing edge are more effective for low angles of attack; locations near the leading edge are more effective for higher angles of attack. At the stall angle of attack, a maximum reduction in the lift coefficient was observed as Δ C L=− 0.33 when the blowing location was at x J/c= 0.08 for the largest flow rate coefficient (C Q= 0.44%) tested. Even for completely separated flows, upstream blowing near the trailing-edge can modify the recirculation region and cause the shear layer to deflect upwards, resulting in a reduction of lift. This is a significant advantage over mechanical flaps placed near the trailing-edge, which remain in the separated flow and lose their effectiveness.
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