多斜孔壁的非均匀孔排布优化设计及传热特性数值分析

Optimization Design of Non-uniform Holes Distribution and Numerical Analysis of Heat Transfer Characteristics for Effusion Plate

为解决多斜孔壁应用于实际燃烧室时容易出现前端冷却效果较弱的问题,采用多斜孔非均匀孔排设计,对壁面前端的开孔分布规律进行了重点优化,采用数值模拟方法研究了不同孔排规律对冷却效果的影响。结果表明,非均匀孔排布设计可使流量分配规律得到优化,挖掘了壁面后端冷却气的冷却潜力,改善了壁面温度的均匀性,且控制在材料许用温度范围内;轴向温度梯度有所减小,同时冷却空气量明显减少;在开孔面积一定的前提下,采用增加孔数,减小孔径的方式能获得较佳的冷却效果。

When applied to combustion chamber, the head of the effusion plate is bad in cooling effect. The non-uniform holes design was adopted to deal with the problem. The distribution of the holes in the front of the effusion plate was importantly optimized, and the effect of different holes distribution on the cooling effect was analyzed by the numerical simulation method. The results show that the design of the non-uniform holes distribution can optimize the flow distribution rules, improve the cooling effect of the end of wall and the uniform of wall temperature. The temperature gradient decreased and the cooling air flow rate was reduced. With the same opening area, the cooling effect of the plate is better by increasing the holes number and reducing the holes diameter.