飞机整体瞬态热状况的数值仿真研究

 在分析飞机内外热环境的耦合传热机制基础上，建立了描述飞机整体瞬态热状况的物理数学模型。引入壁面热流函数，将飞机蒙皮外的气动对流与辐射换热作用转化为舱内热分析的浮动热边界条件，实现了飞机内外耦合热作用的解耦计算，避免了难以实现的直接耦合求解。采用区域分解技术，将飞机整体分解为特性不同的多个求解区域。采用蒙特卡罗法求解舱内设备之间的辐射换热，采用热网络法求解设备内部及各设备之间的辐射-导热-对流耦合换热。利用该方法对某型飞机飞行过程中的瞬态热状况进行了数值模拟，获得了飞机舱内的瞬态温度场，分析了相关因素的影响，为飞机设计及相关研究提供了重要依据。

Numerical Analysis on the Transient Thermal Status of Aircraft

Based on analyzing the heat transfer mechanism governing the thermal status of aircraft as a whole, the thermal analysis models are derived. By introducing a wall heat flux function, the effects of aerodynamic heat transfer and thermal radiation outside aircraft skin are transformed into a kind of flexible thermal boundary condition for the internal thermal analysis, which helps to realize the decoupling of inside and outside thermal interaction. By domain decomposition technique, the whole aircraft is divided into many regions to make the solution relatively easy. In a single domain, the coupled heat transfer of conduction with radiation and convection is solved by the thermal network method combined with the Monte Carlo method. The FLUENT code is used to simulate the aerodynamic heat transfer outside skin. By these methods, the transient temperature field of an aircraft is simulated numerically. From the result analysis, some valuable conclusions are obtained.