Coupled Effect Of Aerodynamic Heating&Motor Heating On The Steering Cabin

With the development of missile technology and improved performancerequirements of combat in modern war, missile are moving in the direction of high speed,high precision and high mobility, making it one of the most lethal weapons over a longdistance.When flying in the dense atmosphere at high-speed, the surface of missile is heatedbecause of the surrounding air by the strong compression. Most of turbulence kineticenergy is transformed into heat energy, leading to a dramatic increase in air temperature.Due to large temperature difference between the aircraft surface and air, heat quicklytransfers to the solid surface. At low speed aerodynamic heating phenomenon is notobvious, but because of the high energy flow at supersonic, aerodynamic heatingbecomes very serious.Toward the direction of the supersonic and hypersonic missile development, itentered the ramjet working field. Solid rocket ramjet is one of the scramjet, and the leanoxygen gas produced by solid fuel sucks in air from the engine in afterburning indoormixture combustion, high temperature and high speed gas produced by the dischargenozzle thrust. Under the high temperature gas scour, a lot of calories after ablative layer,such as thermal barrier engine into the projectile internal thermal protection structure,improve the environment temperature, increases the heat load of the internal components.Based on the typical high speed flight vehicle, through CFD method, this papersimulated and analyzed the temperature variation of steering cabin under the coupledeffect of heating from aerodynamic and motor, which the speed is at Mach number4.0and the height is12kilometers. According to the experiment data of Sparrow III andLaval Nozzle, the turbulence model, iteration time step and mesh correlation werecalibrated. During the simulation, the two equation turbulent model k-e was used to solvethe Navier-Stokes equation, the interaction of fluid-thermal was set loose coupling. Results indicate that, under the coupled effect of the heating from aerodynamic andmotor, the temperature of the steering cabin increases obviously. When flight time is over60seconds, the average temperature of steering cabin reaches400K, which will do muchdamage to the operation of the steering engine. For high speed flight vehicle workinglong time, it is meaningful to pay more attention to the thermal protection of steeringcabin during design period.