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액적 내부 유동 가시화를 위한 축대칭 형상 왜곡 보정에 관한 연구
김영현(Yeonghyeon Gim),고한서(Han Seo Ko) 한국가시화정보학회 2014 한국가시화정보학회지 Vol.12 No.3
Optical distortion of experimental results can be found in many studies. Thus, a method of the optical correction for visualization of an axisymmetric droplet was developed in this study. The correction method was derived to extract refracted vectors. In order to obtain the refracted vectors, a projection vector and a normal vector should be calculated. Then, a distortion distance can be found by the calculated refracted vector and Snell’s law. The developed method was also verified by the simulation and the experimental results to apply for a liquid droplet which was formed at a nozzle tip.
이재원(Jae Won Lee),신동호(Dong Ho Shin),김영현(Yeonghyeon Gim),고한서(Han Seo Ko) 한국가시화정보학회 2016 한국가시화정보학회 학술발표대회 논문집 Vol.2016 No.12
In this study, control of turbulent flow inside a duct with an irregular cross-sectional area was analyzed, and a numerical method was developed. The Reynolds number of the duct flow was measured by a particle image velocimetry (PIV), and the new method was suggested to control the randomly fluctuated flow in the entrance region. The flow field was reconstructed by the developed numerical method and the reliability was verified by comparing with the result of the PIV experiment. Using the result of the experiment, the prediction method of the turbulence according to the operating condition of air duct was analyzed. Also, the turbulent kinetic energy of the duct flow was derived. As a result, the control method of the turbulent flow was developed and the numerical method within 5% of the error rate was developed.