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本文对民机用辅助动力装置(APU)通风冷却系统进行合理简化,建立了2维计算模型,并数值研究了在地面工作情况下APU尾喷口位置对通风冷却系统引射冷却性能的影响,研究表明:当外界环境条件及APU尾喷口射流参数不变时,在不同的APU尾喷口位置下,通风冷却系统内部具有相似的流场特征,但随着APU尾喷口逐渐进入排气管,APU射流同冷却空气流的掺混效果逐渐减弱,冷却空气流流量逐渐减小,APU通风冷却系统的引射冷却性能逐渐恶化。
In this paper, the air conditioning and cooling system of APUs is reasonably simplified. A two-dimensional calculation model is established and the influence of the location of APU tail outlets on the cooling performance of the ventilation cooling system is studied numerically. The results show that when the ambient conditions and the jet parameters of the APU tail nozzle are unchanged, the air flow cooling system has similar flow field characteristics at different APU tail nozzle positions. However, with the APU tail nozzle gradually entering the exhaust pipe, the APU jet The mixing effect with the cooling air flow is gradually weakened and the flow rate of the cooling air flow is gradually reduced, and the ejecting cooling performance of the APU ventilation and cooling system is gradually deteriorated.