Numerical Research Of Aerodynamic Heating And Thermal Environment Over Aircraft At Hypersonic Flow

The aerodynamic heating and temperature fields of hypersonic aircraft were calculated by using the engineering and numerical simulation methods. The result of the paper can provide the meaningful reference to the design of aircraft and thermal protection.Firstly, in the unstructured meshes, the unsteady diffusion equations were solved by using the finite volume method (FVM), the normal direction vector and the tangent direction vector were calculated by using the intersectant and iterative algorithm to meet the requirement of high-precision discrete scheme. The 2D program has been created by Fortran and the pre-processor has been connected with the commercial software Tecplot.Secondly, the coefficient of heat convection that flowing around the cone was derived by Magle transformation, and combined the correspondence with the shock forward and backward, as well as enthalpy method, then the convection heat flux on the surface of aircraft at hypersonic flow to the program was derived and it was as the third boundary condition in the unstructured grid. On this basis, calculate the thermal environment of aircraft at different flight conditions and analysis the influence of different thickness and thermal conductivity of heat shield.Last, RTE is discredited with the same way as above, and write the program of Radiation. Then calculate the incident radiation in the aircraft with a certain boundary condition. Calculate and analysis the regularity of aircraft incident radiation distribution with different Mach numbers.The results show that:the higher the free stream Mach number, the heat flux on the surface and the temperature of aircraft were greater. Turbulent flow worsen thermal environment of aircraft. The absorption thermal protection could absorb and slow down the internal heat transfer and thermal stress of the aircraft. The thicker thermal protection and less thermal conductivity made to more obvious effect. The incident radiation in aircraft was greater with the development of Mach number.