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박한영(Han-Yung Park),조성수(Sung-Su Cho),김진훈(Jin-Hun Kim),박종호(Jong-Ho Park),이연주(Yeon-Ju Lee) 한국유체기계학회 2008 유체기계 연구개발 발표회 논문집 Vol.2008 No.-
In this paper, it is intended to figure out the features and causes of the processes of creations, growths and disappearances of spiral-vortex-flow generated in the Francis's turbine generally. The spiral-vortex-flow generated from the Draft-Tube in the Francis's turbine is estimated to have negative effect on powerplant structure and also to the people inside the building as well as to lead to a low-frequency-vibration driven by sub-synchronous whirl vibration. Therefore, we intend to investigate how much the low-frequency-vibration has an influence upon the powerhouse structure and practice analyzing the effectiveness on the previously-introduced methods to reduce side-effects of sub-synchronous whirl vibration and finally we intend to show the optimal solutions through this paper.
박한영(Park Han Yung),이동근(Lee Dong Keun),김한일(Kim Han Il) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
This new concept of Lake water circulation equipment using convectional phenomenon is developed to replace existing lake water circulation equipment of which efficiency is very low, so it consumed a lot of energy. This new lake water circulator's efficiency is improved greatly by water's convectional phenomenon in lake, therefore this circulator consume only small amount of energy which can be generated by solar cell.
박종호,박한영,Park, Jong-Ho,Park, Han-Yung 한국유체기계학회 2011 한국유체기계학회 논문집 Vol.19 No.1
Flow control range of valve, which is installed on pipeline, varies according to valve type, pipe diameter, pipe length, roughness, and elevation difference of both ends of pipeline. A lot of computation efforts and knowledge are needed to estimate flow control range of valve, considering above many parameters. The table of flow control range of each valve type is presented for convenience of pipeline design engineers who must make decision of valve size and type in this study. Also the reason that butterfly valve is recommended for flow control, and gate valve is forbidden is presented via quantification and figures in this study.
박종호,박한영,Park, Jong-Ho,Park, Han-Yung 한국유체기계학회 2011 한국유체기계학회 논문집 Vol.19 No.2
Linear curve or hyperbolic curve interpolation equations have been used to represent loss coefficient of butterfly valve according to a certain opening(for example, each 10 degree up to 90 degree) so far, and these equations are not precise and inconvenient to use with computer programming. Method of representing loss coefficient of butterfly valve using experiment data with several equations is presented and It is verified that log equation is most precise and convenient to use with computer programming in this research.