Simulation of shock wave buffet and its suppression on an OAT15A supercritical airfoil by IDDES
Simulation of shock wave buffet and its suppression on an OAT15A supercritical airfoil by IDDES
复制标题
IDDES对OAT15A超临界翼型冲击波抖振及其抑制的模拟
DOI：
10.1007/s11433-011-4601-9
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发表时间：
2012-01
期刊：
影响因子：
--
通讯作者：
Fu Song
中科院分区：
文献类型：
--
作者：
Huang Jingbo;Xiao Zhixiang;Liu Jian;Fu Song
本文首次采用最先进的RANS/LES混合方法之一IDDES对马赫数为0.73、迎角为3.5度的OAT15A超临界翼型上表面强激波/边界层相互作用（SWBLI）引起的极非定常激波冲击进行了数值模拟。结果表明，传统的URANS方法不能有效地预测机翼表面的抖振现象；IDDES涉及更多的流动物理，预测了自助餐现象。预测并论证了激波沿流方向的周期性振荡、SWBLI引起的强剪切层与激波分离、剪切层不稳定破坏和尾迹中的大量小尺度结构等复杂的流动现象。脉动压力系数的均方根值和激波沿流振荡范围与实验数据吻合较好。然后在上表面激波区前方安装两个与主流方向倾角均为30度的涡发生器（VG）来抑制激波冲击。结果表明，VGs能显著抑制激波自助餐，有效降低了自助餐区的压力均方根水平，平均激波位置明显下移，导致总升力增加。
In the present paper, extremely unsteady shock wave buffet induced by strong shock wave/boundary-layer interactions (SWBLI) on the upper surface of an OAT15A supercritical airfoil at Mach number of 0.73 and angle of attack of 3.5 degrees is first numerically simulated by IDDES, one of the most advanced RANS/LES hybrid methods. The results imply that conventional URANS methods are unable to effectively predict the buffet phenomenon on the wing surface; IDDES, which involves more flow physics, predicted buffet phenomenon. Some complex flow phenomena are predicted and demonstrated, such as periodical oscillations of shock wave in the streamwise direction, strong shear layer detached from the shock wave due to SWBLI and plenty of small scale structures broken down by the shear layer instability and in the wake. The root mean square (RMS) of fluctuating pressure coefficients and streamwise range of shock wave oscillation reasonably agree with experimental data. Then, two vortex generators (VG) both with an inclination angle of 30 degrees to the main flow directions are mounted in front of the shock wave region on the upper surface to suppress shock wave buffet. The results show that shock wave buffet can be significantly suppressed by VGs, the RMS level of pressure in the buffet region is effectively reduced, and averaged shock wave position is obviously pushed downstream, resulting in increased total lift.
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DOI：
10.14279/depositonce-2305
发表时间：
2007-02
期刊：
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影响因子：
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DOI：
10.2514/6.1999-789
发表时间：
1998-11
期刊：
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影响因子：
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作者：
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