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从基于雷诺平均的N S方程出发 ,采用有限体积方法离散控制方程 ,数值模拟了三维超声速隔离段湍流内流场。计算中采用了二阶OC TVD差分格式、LU隐式算法和Baldwin Lomax代数湍流模型。数值结果与实验做了对比 ,并结合隔离段中的激波串结构分析了其横截面上旋涡结构的发展过程及不同外形条件下旋涡的不同结构。计算结果表明采用本文发展的方法模拟隔离段湍流流场是可行的 ,截面为正方形与长方形的隔离段内的涡旋结构截然不同
Based on the Reynolds-averaged N S equation, the finite volume method is used to discretize the governing equations to simulate the turbulent internal flow field in a three-dimensional supersonic supersonic isolation section. Second-order OC TVD difference scheme, LU implicit algorithm and Baldwin Lomax algebraic turbulence model are used in the calculation. The numerical results are contrasted with the experiments. The development of the vortex structure in cross section and the different structures of the vortex under different shape conditions are analyzed in combination with the shock train structure in the isolation section. The calculation results show that it is feasible to simulate the turbulent flow field in the isolation section by the method developed in this paper. The cross section is quite different from the vortex structure in the rectangular section