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中文核心期刊

再入湍流尾迹及其对雷达散射的影响研究

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

  • 摘要: 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.

     

    Abstract: 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,...

     

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