The Investigation Of Solid, Gas Thermal Response Dynamic Coupled Process In Multi-body System

Thermal control system is an important part of the aircraft, which plays a crucial role on the aircraft during service can work stably and reliably. Thermal analysis calculation is a main step of aircraft thermal control system in the design process, which is mainly used to predict the temperature field of aircraft and internal equipment and provide support to design and verification of thermal control project. Thermal analysis of instruments in aircraft cabin is a complicated problem which coupling conduction, convection and radiation in multi-body system solving very complex. Currently, treatment methods for solid heat conduction and surface radiation heat transfer of thermal analysis software SINDA/FLUINT are recognized in aerospace domain, which is used for thermal analysis calculation of the spacecraft. It presence natural convection in the aircraft cabin which run in the atmosphere. However,SINDA/FLUINT solve convective heat transfer problems by providing convective heat transfer coefficient or experiment correlations of natural convection in an infinite room, which make large deviations. On the other hand, FLUENT etc CFD software have advantage in the solve of flow and heat transfer problem, but for the transient solve of aircraft cabin which couple heat conduction, convection, radiation heat transfer process is low computational efficiency and even can not be carry. Based on this background, this paper launched numerical and experimental study of solid, gas thermal response dynamic coupling process in multi-body system. Which mainly include the following aspects :1 Solve the complex multi-body system transient heat transfer problem which coupling heat conduction, convection and radiation through the secondary development of SINDA/FLUINT and FLUENT software to achieve a combination of thermal network analysis method and CFD solve technology.2.Apply three methods which are SINDA/FLUINT, FLUENT and combine the two softwares to complete thermal analysis of a multi-body system.By comparing transient and steady results, this paper know the adventures and disadventures of this three method and prove that the combined use of two methods for thermal analysis of multi-body system coupled heat transfer problem feasibility and reliability.3 Studing natural convection and radiation coupled heat transfer characteristics of heating surface of under different conditions. Obtained the transient and steady-state temperature of the heating surfaces in different conditions by experimental measurement,deduced corresponding wall average convective heat transfer coefficient, convection heat flux and radiation heat flux. Comparative analysis the effects of the air pressure of enclosed cavity,hot and cold plate temperature, the distance between the heating surface have on heat transfer characteristics.of the heating surfaces.