论文部分内容阅读
经过推导给出了具有孔内和内外表面对流换热及外表面热辐射复杂边界条件下的多层多孔壁温度场的计算模型，并以具有陶瓷隔热涂层的全气膜覆盖气冷叶片为例进行了温度场计算。计算结果表明：陶瓷涂层具有明显的隔热效果，并可明显地减小冷却空气用量；燃气温度对壁温影响较大；考虑热辐射将更加符合实际物理过程；对于涡轮叶片若不考虑热辐射将低估壁温 １．５％ ～３．５％ 。该模型可用于多层多孔壁冷却结构形式的发动机高温部件的优化设计。
The calculation model of multi-layer porous wall temperature field with convective heat transfer inside and outside the surface and heat radiation of the outer surface under the complex boundary condition is derived. The gas-cooled blade For example, the temperature field calculation. The calculated results show that the ceramic coating has obvious thermal insulation effect, and can obviously reduce the amount of cooling air; gas temperature has a greater impact on the wall temperature; consider the thermal radiation more in line with the actual physical process; for the turbine blade without considering the heat Radiation will underestimate the wall temperature 1.5% ~ 3.5%. The model can be used to optimize the design of engine high temperature components in the form of multi-layer porous wall cooling structures.