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수력 현대화 개 · 대체 시 스파이럴 케이스와 흡출관 형상에 따른 모델수차 설계 적용사례 연구
박노현(Nohyun Park),김진혁(Jin-Hyuk Kim),김승준(Seung-Jun Kim),현정재(Jungjae Hyun),최종웅(Jongwoong Choi),조용(Yong Cho) 한국신재생에너지학회 2020 신재생에너지 Vol.16 No.2
Recently, turbines operating in hydro power plants are required to undergo renovation and modernization due to their age exceeding 30 years. In the process of renovation or modernization, a performance test of the scaled-down model is necessary to verify the performance of the real-size model. This model test method, with criteria that is similar to that of a real turbine, is the most economical and important method. Furthermore, the shapes of the runner and guide vane can be modified or replaced easily. However, during the process of modernization, the components with the spiral casing and draft tube are impossible to repair or replace because of the buried ground. Thus, in this study, numerical analysis is conducted to investigate the hydraulic performance based on the difference between the two-dimensional computer-aided design (CAD) shape and the real three-dimensional scan shape of the spiral casing and draft tube.
박용민(Yongmin Park),황태경(Tae Kyung Hwang ),정상기(Sangki Chung),박노현(Nohyun Park),장준열(Jun Yeol Jang),나창운(Changwoon Nah) 한국추진공학회 2017 한국추진공학회지 Vol.21 No.2
Tow Prepreg is the intermediate material for filament winding process that has been “pre-impregnated fiber tow” with resin system. As “dry filament winding” process emerges as a reliable alternative to conventional filament winding (called “wet filament winding”) process, interest in tow prepreg as a material for dry filament winding is rising as well. In this article, we have reviewed the recent research trends in carbon fiber tow prepreg for high-performance rocket motor cases, fuel tanks for hydrogen vehicles and other high-quality commercial pressure vessels.