LTRAN2的一种改进方案

本文提出了LTRAN2的一种改进方案BTRAN2用来分析翼型的各种频率的非定常运动。用E-O调转换格式和ADI方法求解了完全的二维非定常跨音速小扰动位流方程,并用单调转换的AF2格式计算了定常跨音速小扰动方程,以此作为非定常计算的初场。本文给出了带后缘正弦振荡襟翼的NACA 64 A006翼型的绕流和做正弦俯仰振荡的NACA 64 A010翼型的绕流计算结果,它们与Euler方程解或实验数据很吻合。

AN IMPROVED VERSION OF LTRAN2

In the present study an improved version of LTRAN2,which is named by BTRAN2,has been employed to predict unsteady aerodynamic loads even in high frequency. The ability to treat unsteady motions of all frequencies is obtained by solving the complete unsteady TSD equation. Solutions are advanced through series of time level using ADI algorithm, in which the monotone differencing of Engquist and Osher is incorporated. In the present paper the 2-D steady TSD equation is also solved by the AF2 scheme with the monotone differencing as an initial condition for solving the unsteady equation. In the present paper two examples have been calculated. Good agreements of the present method with the Euler solution and the available experimental data are obtained.