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Case study of a low head & kaplan turbine efficiency measurement using ASFM
이용준(Lee, Yongjun),오석영(Oh, Suegyoung),신창식(Shin, Changshik),현정재(Hyun, Jungjae) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
This study concerns a low head and kaplan turbine efficiency measurement using the acoustic scintillation flow meter(ASFM). The ASFM is one of absolute discharge measurement methods because it measures velocity-area of discharge with couples of transducers. This study shows that the highest efficiency of turbine is 87.7% and the efficiency is 85.8% in the rated output(600kW). The test result is reliable because the efficiency trend from this test is similar to the result of index test conducted in 1986. In this paper, the principle, measurement methods, application and test procedures of the test are discussed.
지능형 헤드램프를 위한 기능안전지원 적층형 멀티페이즈 DC-DC 부스트 컨트롤러 설계
이건(Keon Lee),강우성(Woosung Kang),김성재(Sungjae Kim),조범철(Beomcheol Cho),현정재(Jungjae Hyun),김영석(Youngsuk Kim),박형민(Hyungmin Park),우재혁(Jaehyuck Woo) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
This paper introduces an optimized multi-phase boost controller that can flexibly design the increased current capability of the intelligent front lighting system and meet enhanced functional safety requirements. The proposed IC is designed to operate as a 2-phase boost converter but stacking two IC’s can also function as a 4-phase boost converter, allowing it to cope with individual IC failures or head ramp system malfunctions through its built in Safety Mechanism. The stackable multi-phase boost controller employs peak current mode and can operate flexibly within a range of 100 kHz to 1 MHz, depending on the configurations. It was implemented using 0.18um BCD process and verified by simulation to drive up to 200 W in 4-phase mode. The proposed IC is expected to contribute as a key technology to the optimized development of IFS, as it can support to various current demands and safety requirements.
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.