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本文针对低Re数空气动力学和大展弦比低翼载飞行动力学这两个影响临近空间太阳能飞行器成败的核心基础力学问题开展了研究分析.结果表明:数值和风洞试验结果均很好地捕获了随Re数下降升阻比快速下降的趋势,分析其产生机理在于随Re数下降一方面摩擦阻力系数增加,但起主导作用的是层流分离造成压差阻力大幅增加和升力系数下降,从而使气动效率大幅恶化;发现了后缘层流分离泡这种新的流动结构,由此阐明了低Re数条件下气动特性所具有的非线性效应,其根本原因在于层流分离涡结构的突变;发现了临近空间太阳能飞行器运动响应新的模式,研究表明造成其运动响应异常最为根本的原因在于其低翼载和大展弦比气动布局与飞行动力学之间的耦合效应.
In this paper, two core mechanics problems affecting the success or failure of solar vehicles near space are studied in this paper, which focus on the low-aerodynamics and low aspect-ratio low-wing aerodynamic performance. The results show that numerical and wind tunnel test results are very good The trend of decreasing ascending and descending resistance ratio was captured with the decrease of Reynolds number. The mechanism of production was analyzed as the Reynolds number decreased and the frictional resistance coefficient increased. However, the dominant factor was the drastic increase of the pressure drop resistance and the decrease of the lift coefficient , So that the aerodynamic efficiency is significantly deteriorated. The new flow structure of the trapping edge laminar separation bubble is found, and the nonlinear effect of the aerodynamic characteristics under the low Reynolds number condition is elucidated. The fundamental reason is that the laminar flow separation vortex structure The discovery of the new mode of motion response of solar spacecraft approaching spacecraft has shown that the most fundamental reason for its abnormal motion response lies in the coupling effect between its low wing and large aspect ratio aerodynamic layout and flight dynamics.