Fluid-Thermal-Structural Coupling Calculation And Performance Analysis Of Scramjet Engine Inlet

In hypersonic flight,the aircraft faces a harsh aerodynamic and aerothermal environment.It results in a large structural deformation of the inlet under long-time high Mach number conditions,which adversely affects performance.Numerical simulation of the aerodynamic heating and structural thermal deformation of the hypersonic inlet has a significant research significance and value.In this paper,a fluid-thermal-solid multi-field coupling analysis method is adopted,which combines fluid-thermal coupling finite volume method and thermal-structural coupling finite element method.The method considers the real-time interaction between flow and heat transfer,and its accuracy is verified by comparing with the experimental results.The multi-field coupling analysis of the GK01 2-D inlet model is carried out under variable angle of attack.The results show that the ramp of the inlet deforms along the positive direction of the Y-axis of the body coordinate system,and the cowl deforms along the negative direction of the Y-axis.As the angle of attack changes from negative to positive,the deformation of the ramp increases significantly.Compared with the original status,the average Mach number,total pressure recovery coefficient and static pressure ratio of the inlet change mostly at 0 angle of attack;as the absolute value of the angle of attack increases,the change of the inlet's performance parameters gradually decreases.Then,for the 3-D curved shock sidewall compression inlet designed in this paper,the structural thermal response of the inlet at 0 angle of attack and the influence on the inlet performance are studied.The results show that the compression sidewall can play the role of constraint,so that the deformation direction of the cowl is the same as that of the ramp,which is along the positive direction of the Y-axis of the body coordinate system.The inlet deforms mostly on the Y-axis direction,less on the X-axis direction,and minimally on the Z-axis direction.After the deformation,the static pressure ratio of the inlet is greatly increased,and the average Mach number,the total pressure recovery coefficient and the mass flow coefficient on the outlet are lower than original.