Thermal Performance Simulation And Structure Optimization Of A Quartz Lamp Radiant Heater

Quartz lamp radiation heaters is used to simulate the situation that aircraft is heated by the friction heat with air, thereby determining weather the strength of the fuselage material can withstand the heat stress generated by aerodynamic heating. In order to ensure the reliable operation of the quartz lamp heaters, the thermal performance and structure stress of the quartz lamp are analyzed by using numerical simulation method, and the improvement scheme of the channel structure is presented.The main results of this paper are as follows:1.The heater model consists of sizes with different orders of magnitude, which causes difficulties in grid partitioning. This paper gives three methods of grid division for multi-scale models, respectively, the local grid refinement method, structured grid, hybrid grid. A hybrid grid method is proposed for the mesh division of the complex model,which can reduce the computation scale as far as possible,on the premise of ensuring accuracy.2.The temperature field of the heater analyzed by ANSYS FLUENT was compared with the experimental results,which si in agreement with the experimental result. On this basis,the thermal stress analysis of the reflective plate is carried out using the static structure analysis module of the Workbench ANSYS platform and its result show that the maximum thermal stress of the reflecting plate exceeds its yield strength.The simulation results accord with the deformation and fracture of the reflecting plate in the test process.3.For the heaters cooling system to meet the cooling demand,cold plate structure of four kinds of improved methods, spiral flow channel structure, wing column flow structure,parallel flow channel structure, dual S-type channel, double helix type S and trapezoid pipe parallel structure, is put forward. Simulation analysis of the improved structures show that the heat transfer performance of the heater is improved, and the maximum stress of the reflecting plate can be controlled under the yield strength at the given inlet conditions.4.The effects of coolant inlet velocity and temperature on the heat transfer are analyzed,and its results show that the maximum temperature of the reflector plate, maximum stress and deformation with increasing inlet velocity decreases, and the downward trend become slow when the speed increases to a certain extent. However, the pressure loss in the process of fluid flow is just the opposite with the above-described situations. Therefore, the temperature of the coolant also should be adjusted in order to better meet the cooling requirements of the heater.