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为了研究三角翼周围不可压缩流动,利用离散涡元模拟了旋涡的产生、聚集和输送过程。用Lagrange法描述离散涡元的移动,涡元的移动速度通过广义Biot-Savart公式结合快速多级子展开方法计算,粘性扩散通过粒子强度交换(PSE)法模拟。数值模拟了80°后掠角的细长三角翼在低Reynolds数不同攻角下前缘涡的发展和非对称破裂特性,通过分析“滚转”力矩在攻角增大时的变化,得出自激“滚转”振动的起振攻角为23°。
In order to study the incompressible flow around the delta wing, the generation, accumulation and transport of vortices are simulated using discrete vortices. The displacement of discrete vortex elements is described by Lagrange method. The moving speed of vortex elements is calculated by generalized Biot-Savart formula combined with fast multistage sub-expansion method, and the viscous diffusion is simulated by particle intensity exchange (PSE) method. The development and asymmetrical rupture of the leading edge vortex under the low Reynolds number of attack angles are numerically simulated for the thin delta wing with 80 ° sweep. By analyzing the change of the “roll” moment when the angle of attack increases, Get excited “roll ” vibration starting attack angle of 23 °.