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对双层壁扩压器与波瓣喷管组合的三股气流的引射混合进行了流场温度场的数值计算。计算域划分为各子域 ,通过求解拉普拉斯方程 ,分别生成三维贴体曲线坐标网格 ,边界网格加密且波瓣处正交 ,各子域组合成整个网格。为避免因波瓣造成的网格强烈的非正交而引起解的发散 ,本文采用了同位网格 SIMPLEC计算方法和Chen-Kim修正的 k-ε湍流模型。固体区域采用大粘性解决流固耦合 ,还结合了线性欠松弛和拟瞬态欠松弛。结果证明 :双层壁间有外界冷气流被引射进入 ,形成壁面的冷却气流 ,相对单层壁扩压器 ,双层壁扩压器的壁面温度明显降低。对于小扩压角 ( 0～ 5°) ,随着扩压角的增大 ,壁面平均温度降低 ;但当扩压角较大时 ( 5～ 1 0°) ,壁面平均温度则增加
The numerical simulation of flow field temperature field is carried out for the mixture of three air flows combined with double wall diffuser and lobed nozzle. The computational domain is divided into sub-domains. By solving the Laplace equation, the three-dimensional fitting curve coordinate grid is generated respectively, the boundary grid is encrypted and the lobes are orthogonal, and the sub-domains are combined into a whole grid. In order to avoid the divergence caused by the strongly non-orthogonal meshes caused by the lobe, this paper uses the SIMPLEC method and the k-ε turbulence model modified by Chen-Kim. Solid area with large viscosity solution to fluid-structure coupling, but also combines the linear under-relaxation and pseudo-transient under-relaxation. The results show that the outer cold air flow is introduced into the double wall to form the wall cooling air flow, and the temperature of the wall of the single wall diffuser and the double wall diffuser is obviously reduced. For the small diffuser angle (0 ~ 5 °), the average wall temperature decreases as the diffuser angle increases. However, when the diffuser angle is large (5 ~ 10 °), the average wall temperature increases