层板冷却结构流阻特性的实验与数值模拟

Experimental and numerical investigation of internal-flow resistance characteristics in laminate porous plates

关键词:  冷却系统  流动分布  流体阻力  湍流模型  数值仿真

Key words:  Coolant system  Flow distribution  Fluid drag  Turbulence model  Numerical simulation

摘要:

在吸气式风洞上对两种不同内部流动结构的单层多孔层板进行了流阻实验,采用沿程阻力关系式得出了其流阻特性。应用软件FLUENT,采用隐式有限体积法求解Navier Stokes雷诺时均湍流方程,对层板冷却结构的内部流动进行了数值模拟,湍流模型采用Realizablek ε双方程模型,近壁处湍流利用壁面函数法处理,采用SIM PLE算法求解速度与压力的耦合。计算表明,层板内部流场结构十分复杂,射流冲击后在扰流柱前反卷形成驻涡。层板结构内部存在流速很低的区域。计算得出的流阻特性与实验结果进行了比较,两者符合较好。

Abstract:

The internal flow resistances of two typical configurations of laminate plates were tested in a small-size suction-type wind tunnel. Numerical simulation were conducted to study internal flow field of laminate plates by using FLUENT. An implicit finite volume method was used to solve the Navier-Stokes equation. The Realizable k-ε turbulence model was used and standard wall function were used for near-wall treatment. The coupling of velocity and pressure were performed using the SIMPLE algorithm. The numerical results show that the flow fields of the laminate plates are very complex. A stagnated vortex was formed in the front of cylinder. The regions with very low velocities existed in both investigated configurations. The numerical results are in good agreement with the experimental data.