다양한 고유유량 특성을 갖는 액체수소용 니들밸브의 디스크 형상 설계

• Published in: 한국수소 및 신에너지학회 논문집 Vol. 35; no. 4; pp. 363 - 369
• Main Authors: 황나규미(NAGYUMI HWANG), 강효림(HYOLIM KANG), 강정호(JUNGHO KANG), 한승호(SEUNGHO HAN)
• Format: Journal Article
• Language: Korean
• Published: 한국수소및신에너지학회 2024
• Subjects: 기계공학; Flow coefficient(유량계수); Liquid hydrogen needle valve(액화수소 니들밸브); Inherent flow characteristics(고유유량 특성); Computational fluid dynamics analysis(전산유체역학)
• ISSN: 1738-7264; 2288-7407
• DOI: 10.7316/JHNE.2024.35.4.363

Needle valves are instrumentation devices with quick-opening inherent flow characteristics, used in pipelines requiring rapid flow supply immediately upon opening the flow path. For needle valves applied in liquefied hydrogen plants operating in cryogenic environments, it is necessary from the initial design stage to have various inherent flow characteristics in addition to quick-opening, depending on the intended usage. In this study, the inherent flow characteristics of a 1/2'' liquid hydrogen needle valve were evaluated through computational fluid dynamics analysis. Disk shapes exhibiting various inherent flow characteristics were proposed by deriving the flow coefficient (Cv) according to changes in disk shapes. Among the disk shapes that directly affect the Cv, the disk length and slope angle were selected, and case studies were conducted with nine parameter combinations. From the results of the normalized Cv regarding to opening rates, disk lengths and slope angles exhibiting quick-opening, equal-percentage, and linear inherent flow characteristics were determined.