Aero-optical Effects in Supersonic Compression Ramp Flow Fields:GCV-FFT Method

doi:10.19596/j.cnki.1001-246x.8065

Abstract

Abstract: 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.

Key words: aero optics, supersonic compression corner, turbulent boundary layer, Helmholtz equation, GCV-FFT method

CLC Number:

ZHOU Zhichao, XU Lingfei, REN Tianrong, GU Cunfeng. Aero-optical Effects in Supersonic Compression Ramp Flow Fields:GCV-FFT Method[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2020, 37(3): 284-298.

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