考虑进排气的飞翼静、动态气动特性数值模拟

采用计算流体力学（CFD）数值模拟技术，以二维模型为例，建立了基于小幅度非定常运动的动导数计算方法，构建了考虑喷流引射效应的进排气模型、考虑管道效应的通气模型以及常规的保形模型，分别对其静态以及动态气动特性进行了数值模拟计算，并辨识了其纵向俯仰力矩系数组合动导数。研究表明:非定常动导数辨识方法较为准确可靠，相比保形模型，进排气以及通气模型的静态失速攻角（AOAs）增大，升力系数、阻力系数及俯仰力矩系数也增大，但力矩系数斜率基本不变，说明静态稳定性差异不大。而相同攻角下，进排气影响下的俯仰力矩系数组合动导数绝对值最大，表明了进排气模型具有最大的动态阻尼，而通气模型次之，保形模型的动导数绝对值最小。 

Numerical simulation of static and dynamic aerodynamics for flying wing with intake and exhaust effect

Based on the computational fluid dynamics (CFD) technique, a two dimensional model was adopted to carry out the simulation. A method to identify combined dynamic derivative was developed and testified with small amplitude oscillation, then three computational models: the model with intake and exhaust effect, the model with ventilating effect and traditional fairing model, were built, furthermore the stable and dynamic aerodynamics of the models was numerically simulated, and the dynamic derivatives were also calculated. Results and their analysis indicate that the method to obtain dynamic derivative is reliable, and compared with faring model, the stable stall angles of attack (AOAs) of the other two models are bigger with increasing lift, drag and pitching moment coefficients, however, the slopes of pitching moment coefficient are almost the same, showing there is no clear difference of static stabilities among the models. Moreover, the absolute value of dynamic derivative of intake and exhaust models is the largest for all the models at the same AOA, showing this model has the largest dynamic damping, the model with ventilating effect takes the second place and the fairing model has the minimum value.