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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。
In order to solve the problem of uneven temperature at the exit of the direct warmer on the simulated ground combustion engine test rig, a combined draft fan was proposed. The three-dimensional numerical simulation method was used to study the mixing performance. The results show that the combustor can improve the uniformity of the temperature field under the combined action of thermal diffusion and flow vortex. The improvement of the temperature uniformity by the suction hopper mixer is the best, which makes the temperature uniformity from 0.9286 at the entrance increased to 0.9501. The improvement of the relative temperature difference with the suction hopper mixer was the most obvious, which reduced the relative temperature difference from 0.2496 to 0.2181 at the inlet. The total pressure loss of the complete hopper mixer was the largest.