超音速再入体远场湍流尾迹电子密度计算

目的　计算超音速再入体尾迹的雷达散射截面，并获得尾迹的自由电子数密度等参数的分布； 方法　运用边界层理论求解轴对称等压湍流尾迹流动，根据Ｐｒａｎｄｔｌ的湍流切应力的混合长度理论获得速度分布，用Ｃｒｏｏｃｏ 方法获得温度分布，根据Ｌｙｋｏｕｄｉｓ 的远场尾迹理论计算了轴心参数分布，进一步计算自由电子数密度、尾迹长度等尾迹参数；结果与结论　用本方法计算的自由电子密度所求得的尾迹雷达散射截面比二维结果有较大改进；

Computation of Electron Density of Far Field Turbulent Trail of Hypersonic Reentry Bodies

Aim To give parameters required for the computation of the radar diffusion section of the trail. Methods An engineering model for hypersonic reentry body trail was established, and a calculation was performed using boundary layer theory. Prandtl's mixture length theories of turbulent shearing stress and Crooco method were used to predict the distribution of velocity and temperature respectively. Lykoudis's method was used to calculate the parameters at the axis of the trail. Then the free electron density and trail lengths were predicted. Results and Conclusion The calculated radar diffusion section, using the free electron density of the trail as its input has higher accuracy than the two dimensional results.