高升力系统外形的数值模拟计算

Numerical Simulation of High Lift System Configuration

分析和讨论了高升力系统外形无黏和黏性流动的物理特征,表明了流动现象的复杂性和求解的艰难性。深入研究了二维和三维高升力外形空气动力数值模拟计算的雷诺平均N S(RANS)方程方法、计算结果、以及它们和实验数据的比较。二维结果表明压强分布、速度型等计算值和实验值吻合很好,但最大升力系数两者仍有差异。三维计算最大升力系数的结果与二维类似。还分析了影响计算结果的各种因素,包括计算网格、湍流模型、外形的几何模拟的逼真度等。特别指出了转捩模型研究对提高计算准确度的重要性。文中解释了研究高升力系统外型的数值模拟方法,以及同时发展能估算CLmax的工程半经验方法的重要性和迫切性。

The inviscid and viscous flow physics around a high lift configuration and the complexity of its flow phenomena and the difficulty of its description are analyzed and discussed. The RANS equations method for aerodynamic numerical simulation of a high lift configuration in 2D and 3D cases, the results of computation and their comparisons with experimental data are investigated in detail. The results in 2D case show that the calculated and experimental results of the pressure distribution and velocity profile are well agreed, but some differences exist in the results of maximum lift coefficient（CLmax ）. The situation of CLmax in 3D case is similar to that in 2D case. The influential elements on the calculated results including computational grid, turbulence model, approximation description of the configuration shape et al are analyzed. The importance of the transition model research to increase the computational accuracy is specially pointed out. The importance and the urgency of pursuing research on numerical simulation method and developing engineering semi-empirical method to estimate CLmax for a high lift configuration are explained.