The Surface Shape Design Of Hypersonic Conformal Dome Based On Fluent

In the high-speed flights,the gas in front of the aircraft equipped with the infrared imaging detection system is strongly compressed,the compression will form a very thin shock layer.The pressure inside the shock layer increases,and the temperature is also rapidly rising.Infrared radiation causes the detector's signal-to-noise ratio to decrease,thus affecting the spacecraft's infrared detection and guidance functions.The traditional spherical dome under supersonic will creates greater air resistance and complex heat.But the conformal dome,by its streamlined appearance and shape,can significantly reduce the air resistance,shorten the flight time and improve the environmental adaptability of the optical system.As one of the most widely used CFD softwares in China,Fluent has a strong simulation function and application scope,based on the software,this paper analyzes the outflow field characteristics of the different faces in supersonic speeds.Based on the Fluent simulation platform,an outflow field simulation model is established according to the finite element theory,and the air density field,pressure field,temperature field and heat flux field of the hypersonic aircraft with different facial types are calculated,and the outflow field characteristics of different faces fairing are evaluated.Based on the Fluent simulation platform,the simulation model of different faces are established,the influence of various face factors on aerodynamic performance are analyzed,through the simulation results of changing the eccentricity and the lengthdiameter ratio,the relationship between the two and the air resistance coefficient are studied.And also the aerodynamic performance of a hyperbolic dome within the range of small attack angle are studied.Based on the Zernike aberration theory,the optimization design method of inner surface of the dome is studied,and a hyperbolic dome optical system with fixed correction plate is designed,which reduces the dynamic aberration introduced by the dome and simplifies the structure of the optical system.