组合式风斗混合器掺混性能数值研究

Numerical Simulation on Mixing Performance of

关键词:  风斗混合器  掺混性能  数值模拟  温度均匀性  试验技术

Key words:  Wind scoop mixer  Mixing performance  Numerical simulation  Temperature uniformity  Test technology

摘要:

为了解决航空发动机地面模拟燃烧试验台直接加温器出口温度不均匀的问题，提出了一种组合式风斗混合器，并采用三维数值模拟的方法，对其掺混性能进行了研究。结果表明:在热扩散和流向涡的共同作用下，组合式风斗混合器能够改善温度场的均匀性；抽吸热气用风斗混合器对于温度均匀度的改善最好，使得温度均匀度从入口的0.9286增加到0.9501；抽吸冷气用风斗混合器对于相对温差的改善最为明显，使得相对温差从入口的 0.2496减小到0.2181；完整风斗混合器的总压损失最大。

Abstract:

A combined wind scoop mixer was presented to solve the problem of non-uniform temperature at the exit of direct heating device used in the aero-engine simulation test. Three dimensional numerical simulation was conducted to predict the mixing performance of this mixer. It is found that this mixer could make the temperature field uniform under the effect of thermal diffusion and streamwise vortex. The pumping hot air mixer can improve the temperature homogeneity most obviously than the others，and it increases the parameter from 0.9286 to 0.9501. The pumping cold air mixer reduces the relative temperature difference from 0.2496 to 0.2181，which is the best among the three mixers. The total pressure loss of the whole assembly mixer is the greatest.