산업용 삼중편심 버터플라이밸브의 유동 특성에 관한 연구

A Study on the Flow Characteristics inside a Triple eccentric Butterfly Valve

Research about butterfly valve’s flow characteristics had been achieved about pressure loss factor of valve, cavitation, torque characteristics, flux control characteristics and valve performance etc. mainly. LNG must equip durability with enough intensity having intention because transport and stored in ultra low temperature state of - 162℃. Specially, when work migration, efficiency of valve and highly stability are required. But, an experiment is impossible effectively to problem of huge expense to embody a engineering experiment about cryogenic fluid flow. Therefore, achieved CFD analysis that allow to Reynolds averaged Navier- Stokes equation. It used commercial code CFX11.0 to achieve study hydromechanics about triple eccentric butterfly valve’s flow characteristic and other physical design argument. At first, produced flow coefficient by CFD that apply water by working fluid. Because comparing it with typical value, verified validity. And that achieve analysis for cryogenic state. Eddy flow and pressure change that develop to valve disk rear of various turbulence model in this study applied predictable k-w SST(Shear-Stress Transport) model comparatively correctly. Valve seat upper stream piping length did to get into distance that satisfy enough fully development condition of working fluid that is flowed in valve seat. Stabilized enough distance of so much so that fluid flow that lower stream piping passes valve seat and it is disturbed can stabilize enough. Changed valve disk opening angle by 10, 20, 30, 40, 45, 50, 60, 70, 80, 90 (full opening).