li wen yu, jiang zong fu, xu xiao jun, et al. AAerooptical characteristics measurement of vortexin a low speed heated air flow[J]. High Power Laser and Particle Beams, 2004, 16.
Citation:
li wen yu, jiang zong fu, xu xiao jun, et al. AAerooptical characteristics measurement of vortexin a low speed heated air flow[J]. High Power Laser and Particle Beams, 2004, 16.
li wen yu, jiang zong fu, xu xiao jun, et al. AAerooptical characteristics measurement of vortexin a low speed heated air flow[J]. High Power Laser and Particle Beams, 2004, 16.
Citation:
li wen yu, jiang zong fu, xu xiao jun, et al. AAerooptical characteristics measurement of vortexin a low speed heated air flow[J]. High Power Laser and Particle Beams, 2004, 16.
By a HartmannShack sensor with 37 lenslets at 419Hz , the aerooptical characteristics of a heated air flow were measured. Using modal Zernike reconstructor, a series of dynamic optical path difference (OPD) distribution were obtained, and then Strehl ratioes were calculated. The test gives the results with different flow parameters : mean center flow velocity from 43m/s to 8 m/s and temperature from 44℃ to 85℃ . And the velocities of vortical structures were calculated by correlation analysis. The results show the OPD distribution educed by coherent structure in shear layer changes with flow parameters. When the temperature is more than 65℃,its influence on strehl ratio is not obvious.