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本文给出了尾吊布局的民机发动机短舱与机身组合体的三维空气流动与传热的物理和数学模型,根据发动机短舱和机身的组合模型特点,应用非结构化网格和柱状附面层网格对计算区域进行划分,采用k-ε湍流模型和相应的对流换热、辐射换热模型模拟了短舱风扇罩表面着火后对附近机身的热影响,分析认为采用CFD分析可在防火区选型设计阶段起到辅助作用,可为尾吊布局的民机发动机短舱防火区设计提供一定的参考价值。
In this paper, the physical and mathematical models of the three-dimensional air flow and heat transfer between the nacelle and the fuselage of a civil aircraft with tail suspension are given. According to the characteristics of the combined model of the nacelle and the fuselage, an unstructured grid and The columnar overlay grid divides the calculation area. The k-ε turbulence model and the corresponding convective heat transfer and radiation heat transfer model are used to simulate the thermal effects on the fuselage near the surface of the nacelle fan cover. The analysis shows that the CFD The analysis can play an auxiliary role in the selection design stage of the fire protection zone and provide some reference value for the design of the fire engine compartment of the civil aircraft engine with the tail suspension layout.