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차재은(Jae Eun Cha),정흥준(Heung June Chung) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
This paper presents an preliminary performance test of the supercritical CO₂ compressor which has been developed by KAERI consortium to recover the waste heat from the gas turbine engine. The compressor test facility is based on a supercritical CO₂ power generation prototype. The application target of the SCO₂ power generation prototype is the waste heat recovery system. The prototype has a simple-recuperated system with turbine inlet temperature of 450℃. For the prototype system, major components performance tests should be performed with LM500 grade thermal waste heat. In the first stage, the design and fabrication of the SCO₂ compressor and performance test facility have been performed. The compressor performance test is important because it is related to the cycle performance and efficiency. The test facility consists of SCO₂ compressor, precooler, control valve, flowmeter, and measurement devices. The compressor is designed 36,000RPM under supercritical CO₂ state.
물-공기 횡류시 U 자형 튜브 다발에서의 유체탄성불안정
주인철(In-Cheol Chu),정흥준(Heung June Chung),이창희(Chang Hee Lee),윤영중(Young Jung Yun),정한섭(Han-Sub Chung),변형현(Hyung Hyun Byun),김무용(Moo Yong Kim),문효익(Hyo Ik Moon),이희남(Hui Nam Rhee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
In the present study, a series of experiments have been performed to investigate a fluid-elastic instability of an U-tube bundle in air-water two-phase cross-flow. A total of 39 prototypic U-bend tubes are arranged in a rotated square array with a p/d of 1.633, which is identical to U-bend tube bundle of OPR1000 steam generators. The present experimental facility has 2-span U-tubes in contrast to 9-span U-tubes of OPR1000 steam generators. However, modal analysis shows that the major vibration mode and corresponding natural frequencies are almost same to the full 9-span U-tubes. A total of 12 3-axis acceleromters are installed inside U-tubes to monitor a precise vibration motions. The following parameters were obtained throughout a series of experiments: tube vibration responses and critical velocity for fluid-elastic instability, two-phase damping ratio, hydrodynamic mass. Finally, the instability factor (K) of Connors’ relation was evaluated based on the above measured parameters.
폐열회수 이용을 위한 초임계 이산화탄소발전시스템 탈설계 성능에 대한 연구
안윤한(Yoonhan Ahn),차재은(Jae Eun Cha),서한(Han Seo),이선일(Sunil Lee),정흥준(Heung June Chung) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
As the global climate change becomes substantial, desire to improve power system efficiency increases gradually. Power generation by utilizing the waste heat of gas turbine exhaust flow is another increasing market. Supercritical CO₂ cycle is gaining interests with several benefits: (1) high efficiency in the mild turbine inlet temperature range (450-650℃), (2) simple layout configuration and (3) small foot print coupled with compact heat exchangers and turbomachineries. On and off-design performance of supercritical CO₂ power system based on the component design variables is discussed in this paper. Preliminary design of supercritical CO₂ recuperated layout to make use of the waste heat from gas turbine (LM-2500) exhaust flow is designed and the corresponding turbomachineries and heat exchangers are designed. The compressor inlet condition is designed close to the critical point to improve system efficiency due to low compression work. Printed Circuit Heat Exchangers (PCHE) are designed for the S-CO₂ system because it can operate under high temperature and pressure condition. Radial turbomachineries design parameter and performance maps are generated from in-house code. Based on preliminary component design parameters, off-design performance is analyzed for the condition of cooling water temperature change. As cooling temperature increases, overall system mass flow rate and turbine power decreases, while the compression work increases.