再入湍流尾迹及其对雷达散射的影响研究

就高超声速再入体尾迹等离子体场而言，为进行其亚密湍流雷达散射截面的理论分析，提出了计算湍流尾迹脉动等离子体场强的理论模型及求解方法，即在研究高超声速尾迹流动特征的基础上，推导、使用包括化学组份浓度脉动强度的k－ε－g湍流模型，用以封闭高超声速粘性尾迹湍流运动时均控制方程组，并用全隐式有限差分法求解，算例小钝锥体的飞行条件为零攻角、M_∞＝21．3，Re_（∞D）＝1．33×10~6；M_∞＝20．5；Re_（∞D）＝3．22×10~5，计算结果得到了合理的参数分布；考虑电磁波在上述等离子体介质中的传播，以单电子多次散射模型─—畸变波Born近似方法，计算了湍流尾迹脉动等离子体雷达散射截面，给出散射能（RCS）在不同极化状态下的分布，分析了散射背景场脉动湍流对电磁波在其中传播的影响．

THE STUDY OF REENTRY TURBULENT WAKES AND ITS EFFECTS ON RADAR CROSS SECTION

For analysis of radar cross section (RCS) of hypersonic underdense turbulent ware of reentry vehicles, a theoretical method for calculating the plasma fluctuation intensity is developed based on analysis of the characterization of the hypersonic wake flow. In the method k-ε-g turbulent model is adopted to complete Reynolds equation, in which the chemical component fluctuation intensity is taken into account. The governing equations are solved by fully implicit finite-difference schemes. For calculating RCS,...