鸭式布局战斗机非常规机动的流场机理数值分析

以先进战斗机的非常规机动为对象,发展了一种适用于大幅度运动变化的非结构嵌套网格生成方法,建立了一整套非定常流场N-S方程数值求解方法。在对三角翼动态气动特性计算验证的基础上,模拟了飞机过失速机动条件下飞行姿态和来流速度的变化特征,对鸭式布局战斗机"眼镜蛇机动"的非定常涡结构、非定常气动力效应和气动特性进行了数值研究,揭示了鸭式布局战斗机"眼镜蛇机动"的非定常流场机理。

Numerical Analysis on Flow-Field Around Unconventionally Maneuvering Canard Fighter

An unstructured overset grid generation method is presented to study large amplitude movements of unconventional maneuver of an advanced fighter and a numerical method is developed based on the Navier-Stokes(N-S) equations for analyzing unsteady flow problems. Based on calculation and validation of the dynamic characteristics of a delta wing, flight attitude and velocity variation are simulated when the aircraft is under the condition of post-stall maneuvers. The numerical investigation of the unsteady vortex structure, the unsteady aerodynamics and the aerodynamic characteristics reveal the unsteady flow mechanism of the canard aircraft through Cobra maneuver.