【摘要】 利用有限体积法对三维可压缩的 N- S方程进行离散 ,对内部绕流柱形分别为圆形、方形和菱形的多孔层板冷却结构进行了数值模拟。网格划分采用非结构化网格 ,湍流模型为 Realizable k- ε双方程模型 ,近壁处湍流采用壁面函数法处理 ,采用 SIMPLE算法求解速度与压力的耦合。计算获得了 3种冷却结构内部各气流参数的三维分布和流动阻力特性。结果表明层板内部的流场结构十分复杂 ,射流冲击后在扰流柱前反卷形成驻涡。 3种绕流结构中方形结构流动阻力最小 ,菱形最大。将计算结果与实验结果进行了比较 ,两者符合良好更多还原

【Abstract】 Lamilloy turbine blades, efficient for air cooling, appeared already in experimental advanced aeroengines. The study of optimization of lamilloy configuration for turbine blades has just begun in China. We are among the first in China to study this problem. As a simplification, we used amplified laminate porous plates instead of lamilloy turbine blades to make our theoretical study easier. In this paper, numerical simulation was conducted to study the internal flow field of three laminate plates with different pin shapes. A finite volume method with unstructured meshes was used to solve the three dimensional compressible Navier Stokes equations. The realizable k-ε turbulence model was used and standard wall function was used for near wall treatment. The coupling of velocity and pressure was performed using the SIMPLE algorithm. The numerical results show that the internal flow fields of the laminate plates are very complex. A stagnated vortex was formed in the front of pin fin elements. Less resistance was shown in the laminate plate with cube shape pin fin elements, and more resistance, with pin fin shape of diamond. The calculated resistances are in good agreement with the experimental data.更多还原