二维埋入式进气道的数值分析

NUMERICAL SIMULATION OF THE FLOW OF TWO\|DIMENSIONAL SUBMERGED AIR INTAKE

采用并改进了适用于分离流动的 Ｊｏｈｎｓｏｎ Ｋｉｎｇ 紊流模型，结合 Ｌ Ｕ Ｓ Ｇ Ｓ近似隐式格式和基于 Ｍ Ｕ Ｓ Ｃ Ｌ非线性插值的 Ｒｏｅ 格式编写了雷诺平均的二维 Ｎ Ｓ方程的求解程序。然后借助于该流场计算程序完成了二维埋入式进气道的数值研究，分析了几何设计参数对进气道性能的影响。

Combining the LU SGS implicit scheme and Roe's approximate Riemann scheme based on the MUSCL interpolation, a code for 2 Dimensional compressible Navier Stokes Equations is developed. The Johnson King turbulence model is used to simulate the separated flows. Then the internal and external flow fields of three 2 Dimensional submerged air intakes are computed with the code, and the influence of design parameters on the performance of the intakes is analyzed. The large range of backflow appears in the submerged air intake, especially in the large offset, compact intake. The results also show that the separated range becomes smaller with the reduction of the ratio of the offset to the length of the intake.