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편광기법을 이용한 수직교차평면의 PIV 속도장 동시측정
권성훈(S. H. Kwon),윤상열(S. Y. Yoon),김경천(K. C. Kim) 한국가시화정보학회 2004 한국가시화정보학회지 Vol.2 No.1
A new PIV technique was developed for decreasing optical error which was created during simultaneous measurements of velocity fields at a wall-normal plane and wall-parallel plane by a plane PIV and a Stereo-PIV systems. For experimental study, two different Reynolds number based on momentum thickness, Re<SUB>θ</SUB>=514 and 934 were generated in a blowing type wind tunnel under the condition of zero pressure gradient. The two Nd:Yag laser systems and three CCD cameras were synchronized to obtain instantaneous velocity fields at the same time. To avoid optical noise at the crossing line by the two laser light sheets, a new optical arrangement using polarization was applied. The obtained velocity fields show the existence of hairpin packet structure vividly and the idealized hairpin vortex signature is confirmed by experiment.