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通过耦合求解NS方程组和刚体动力学方程组,数值研究了80°后掠三角翼自由滚转/自由侧滑的耦合运动特性。通过与单自由度翼摇滚特性比较,发现滚转/侧滑耦合条件下三角翼的摇滚现象更为剧烈:在相同的滚转角下,耦合运动的滚转角速度更大,具有相同角速度时,耦合运动所达到的滚转角更大。研究表明:滚转/侧滑耦合条件下,涡流的非对称迟滞振荡仍是维持三角翼周期性等幅摇滚振荡的流动机理;摇滚过程中法向力的侧向分力是产生侧滑运动的主要原因;左滚右侧滑、右滚左侧滑是三角翼滚转/侧滑双自由度耦合运动的作动机制;侧滑运动的引入,导致迎角和侧滑角随滚转角迟滞变化,强化了三角翼摇滚过程中的迟滞效应,加剧流动结构的非对称特性。
By coupling and solving NS equations and rigid body dynamics equations, the coupled motion characteristics of free-rolling / free-sliding of 80 ° swept delta are numerically studied. Compared with the one-degree-of-freedom wing-rock characteristics, it is found that the roll-wing / side-slip coupling condition is more violent. The roll angle of the coupled motion is greater at the same roll angle. When the same angular velocity is obtained, The roll angle reached by the movement is greater. The results show that the asymmetric hysteresis oscillation of the vortex flow is still the mechanism to maintain the periodic amplitude oscillation of the delta wing under the condition of roll-slip coupling. The lateral component of the normal force in the rock roll is the side-slip force The main reason is that left rolling right sliding and right rolling left sliding are the driving mechanism of the delta wing rolling / sliding double degrees of freedom coupling movement. The introduction of the side slip causes the angle of attack and the side slip angle to change with the hysteresis of the rolling angle , Strengthened the hysteresis effect in the process of flexing of the delta wing and exacerbated the asymmetric characteristics of the flow structure.