非定常自由流中的三角翼气动特性
首发时间:2004-11-09
摘要:在南航非定常风洞中,详细研究了非定常自由流对三角翼气动特性的影响。结果表明,在失速攻角附近,非定常自由流对三角翼前缘涡的流动结构产生很大的影响,从而导致模型表面压力分布和模型气动力的变化。在减速过程中,已经破碎的前缘集中涡重新卷起,形成比较强的集中涡,使模型表面压力系数增大,相应的模型气动力也随之增加;在加速过程中,原先的集中涡很快破碎,前缘集中涡的破碎点位置前移,模型表面压力系数相应减小,模型气动力也随之减小。非定常自由流的变化频率和幅值是影响模型气动力变化的重要因素。
关键词: 非定常风洞 非定常自由流 三角翼 前缘涡
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Aerodynamic Characteristics of a Delta Wing
Abstract:The response of a delta wing in unsteady free stream was investigated in the unsteady wind tunnel of NUAA. It was found that the leading-edge vortex structure was changed during a unsteady flow cycle near the stall angle of attack. This change resulted in the variation of pressure distribution and the aerodynamic loads. During the deceleration part of the cycle, the breakdown vortex was been rolled up again and the breakdown position was delayed. The pressure coefficient and lift coefficient increased. During the acceleration part, the vortex broke down quickly and the breakdown position was moved up. The pressure coefficient and lift coefficient decreased correspondingly. The frequency and the amplitude of unsteady free stream were the important effect factors for aerodynamic loads.
Keywords: unsteady wind tunnel, unsteady free stream, delta wing, leading-edge vortex
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No.1225110751099964****
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