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在亚临界流动范围内,利用DES方法对俯仰细长旋成体的流动特性进行数值模拟,给出了细长旋成体在大攻角纵向俯仰中的截面流态特点。研究发现,迎角变化跨越对称至不对称流态的上仰运动会产生明显的气动力迟滞现象,推迟了非对称的产生迎角,并延缓了细长体背风面流态之间的过渡。对细长体大攻角运动气动分析在国内外研究尚少,研究成果对充分利用非定常气动力有指导意义。
In the subcritical flow regime, the flow behavior of the slender slender body was numerically simulated by the DES method, and the cross-sectional flow characteristics of the slender body in the longitudinal pitch at large angle of attack were given. The study found that the variation of the angle of attack across the upward symmetrical asymmetric flow regime will produce significant aerodynamic hysteresis, postponing the onset of asymmetry and slowing the transition between the slender body leeward flow regime. The aerodynamic analysis of slender body at large angle of attack is still scarce at home and abroad, the research results have guiding significance for making full use of unsteady aerodynamics.