Hypersonic Aircraft Thermal Environment Simulation Analysis

Hypersonic aircraft have rapid response ability,precision strike capability,combat vast space,combat military strategic advantages such as penetration ability,it is an important development direction of aerospace,as an important role in the national security in the future.When the aircraft flying at high speed in the atmosphere,on the one hand,suffer from air resistance,on the other hand caused a fierce air in front of the compression and nearby air severe friction,huge heat by kinetic energy,craft near the surface and air temperature rise rapidly.The high temperature directly affects the structure strength of the aircraft and the normal operation of the internal equipment.Therefore,the aerodynamic thermal environment of the aircraft has become an important research work in the design of the aircraft.Based on CFD theory of computational fluid dynamics and ANSYS simulation software,ANSYS FLUENT software was used to calculate the distribution of physical parameters such as temperature,pressure,density and velocity of the model outflow field.The steady-state and static-structural modules in ANSYS were selected to establish the interface with FLUENT,and the flow field result was imported into the coupling simulation calculation to obtain the physical parameter distribution of the structure field.In this paper,two classical examples(two dimensional circular tube and three dimensional spherical head blunt cone)are studied,and the reliability of the calculation method is verified through the comparison between the simulation results and the reference data.Based on the calculation results of the model outflow field,the influence of aerodynamic heat on the structural characteristics is further studied.Aimed at the limitations of two-dimensional circular tube model for flow field depicting ability not equal to 3D model,intuitive 3D figure to complex flow field of the study,and in three dimensions ball head blunt cone as an example for further research.Analyzed different air speed,altitude,flight Angle of attack onaerodynamic heating environment influence,based on the model calculation results and the experimental data contrast,further study on the aerodynamic heat of three-dimensional structure characteristics,the influence of temperature field characteristics and structural characteristics of the model were studied.In this paper,ANSYS simulation software,the establishment of a complete aerodynamic heat coupling numerical simulation method,complete simulation of the thermal environment of the high supersonic aircraft simulation study,the calculation results are verified,calculation method for the efficient,accurate and reliable.The research results provide theoretical basis and data support for the structure design and thermal protection design of the aircraft.