论文部分内容阅读
用Jameson的有限体积法，对某型号飞机在不同飞行状态下的进气道流场进行了数值模拟。求解的控制方程为三维非定常N-S方程。在对流项的计算上用二阶中心差分有限体积法，粘性项的计算则采用作者在［1］中发表的一种有限体积框架下的新的离散化技术，时间方向用多步Runge-Kutta方法进行推进，以增大CFL条件数。湍流模型则采用Baldwin-Lomax代数模型。求解过程中还采用了当地时间步长，隐式残量平均、人工粘性等加速收敛技巧。最后给出了各种飞行状态下进气逼出口截面的平均总压恢复与总压畸变，得出了比较满意的结果。
Using Jameson finite volume method, the numerical simulation of the inlet flow field of a certain type of aircraft under different flight conditions was carried out. The governing equation is three-dimensional unsteady N-S equation. In the calculation of convection terms, the second-order central difference finite volume method is used to calculate the viscous term using a new discrete technique under the framework of finite volume published by [1] in the authors. The time-oriented Runge-Kutta Method to advance to increase CFL condition number. The turbulence model uses the Baldwin-Lomax algebraic model. The solving process also uses local time steps, implicit residual average, artificial viscosity acceleration convergence techniques. Finally, the average total pressure recovery and the total pressure distortion of the cross section of the forced inlet under various flight conditions are given, and the satisfactory results are obtained.