Semi-physical Simulation of Aerodynamic Effect on Quartz Optical Window in the High-altitude and High-speed Environment

Under the semi-physical simulation model, the aerodynamic pressure, aerodynamic heat effect taking place on the outer surface of optical window in the high-altitude and high-speed environment are analyzed. The first step, based on Reynolds Averaged Navier-Stokes equations, combining CFD simulation technology, aerodynamic pressure and aerodynamic heat loading on optical window were computed in different flying situation. Then, based on the calculated pressure and temperature data caused by aerodynamic effect on the optical window, experiments on aerodynamic effect simulation equipment were conducted. Theoretical and practical simulation results showed that the imaging performance of optical system was not affected by the deformation of Fused quartz glass under the aerodynamic circumstance. The semi-physical simulation model makes advices for the optical window design work and the detection of aviation spectral camera imaging performance.