客机APU舱温度场的数值计算

为研究大型客机APU舱传热过程和进行结构热分析，采用数值方法计算了APU舱温度场。采用商业CFD软件Fluent，选用Realizable k-ε湍流模型和S2S热辐射模型建立了APU舱内流动和传热数值计算模型，得到了流场、温度场和热流信息。APU舱中主要传热过程是辐射传热；APU防火罩和排气管隔热罩起到了热辐射遮热罩的作用；防火罩内的APU冷却空气对于降低防火罩温度有重要作用；排气管内的引射冷却空气有效降低了壁面温度。

Numerical computation of temperature in APU compartment of passenger plane

In order to study heat transfer process in APU compartment of passenger plane and to perform structure thermal analysis, temperature field of APU compartment is calculated using numerical method. The computation model of flow and heat transfer process in APU compartment was setup by commercial CFD software Fluent, Realizable k-e turbulent model and S2S thermal radiation model were used, and the flow field, temperature and heat flow information were acquired. Radiation heat transfer is the major heat transfer process in APU compartment; APU fireproofing cover and heat insulation hood of exhaust pipe function as radiation heat shielding screens; and APU cooling air in the APU fireproofing cover plays an important part in decreasing the temperature of the fireproofing cover; the injection cooling air in the exhaust pipe reduced the wall temperature effectively.