Supersonic compression ramp flow is studied. Based on Rytov approximation, a generalized convolution-fast Fourier transform (GCV-FFT) method is used to solve directly Helmholtz equation in inhomogeneous medium. Scattering field of the laser beam and complex amplitude distribution of diffracted field are obtained. Aero-optical parameters including light intensity, optical path difference, Strehl ratio, relative light intensity, beam centroid position and effective beam width are given. It can be seen that the laser beam is transmitted in the turbulent flow field, and the light intensity distribution appears gradually undulates and deviates. As passing through flow field, the beam produces a large degree of distortion, deviation and breakage due to the effect of diffraction. Effect of flow field in compressed ramp region on beam quality is significantly greater than that in fully developed turbulent region. From distribution of relative light intensity, the beam breakage seems to be related to small-scale coherent structure of flow field. The error of Strehl ratio obtained by traditional OPD mean square error or weighted mean square error estimation is greater. More accurate method should be evaluated with PSF method.

A method with CFD technology is used for accurate prediction of temperature field of supersonic and hypersonic kinetic energy projectiles.It includes equilibrium flow governing equations and difference scheme,equilibrium flow Jacobian matrixs and equilibrium gas state equations.A real gas equilibrium air model is used to calculate temperature in vector flux split in a difference scheme.Thermal environment for typical high-speed kinetic energy projectile is validated.Rationality of the method is considered.Temperature field of a designed hypersonic kinetic energy projectile is simulated.Reliable numerical data for projectile aerodynamic design and aerodynamic heat protection are provided.