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为研究俯仰振荡对细长旋成体流场与气动特性的影响,利用雷诺平均方法与大涡模拟的混合方法相结合的脱体涡模拟方法对大迎角下细长旋成体俯仰运动进行了数值模拟研究。通过对背风面分离涡的强度和位置、细长体绕流形态、截面压强系数和侧向力系数的观察和分析,发现施加小振幅、特定频率的俯仰振荡对大迎角细长旋成体背风面流场有明显的控制能力,可以改变流场结构,使背风面非对称流场趋于对称。同时,研究了振荡参数对耦合作用的影响,发现振荡中振幅和频率的增加,加强了俯仰振荡对非对称涡的抑制作用。研究成果对充分利用非定常气动力具有指导意义。
In order to study the influence of pitch oscillation on the flow field and aerodynamic characteristics of slender body, the pitching motion of slender body at high angle of attack was numerically simulated by the so-called ex-vivo eddy simulation combined with the hybrid method of Reynolds-averaged method and large eddy simulation Simulation study. Through the observation and analysis of the flow pattern, the cross-section pressure coefficient and the lateral force coefficient of the vortex on the leeward side, the results show that the leaning of the slender body at high angle of attack The surface flow field has obvious control ability, which can change the structure of the flow field and make the asymmetrical flow field on the leeward surface symmetrical. At the same time, the influence of the oscillation parameters on the coupling is studied, and the increase of the amplitude and the frequency of the oscillation is found, which enhances the suppression of the asymmetric vortex by the pitch oscillation. The research results have guiding significance for making full use of unsteady aerodynamics.