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500 kW 원자력 전기추진 시스템의 브레이튼 사이클 개념설계 및 해석
양수석,조남경 한국추진공학회 2024 한국추진공학회지 Vol.28 No.1
우주의 영역이 점차 확대되어 가고 있으며, 화성을 비롯한 태양계의 행성에 대한 유무인 탐사도 점차 많아질 것으로 예상된다. 이에 따라 화성 유인 탐사를 위하여 기존의 추진기관과는 다른 개념의 추진기관들이 연구되고 있다. 본 연구는 10톤 이상의 유무인 화성탐사선의 추진기관으로 사용 가능한 500 kW 원자력 전기추진 시스템의 브레이튼 사이클에 대한 개념설계 및 해석 결과이다. 원자로는 열용량 1511 kW의 UC계열 저농축 핵연료를 사용한다. 시스템의 효율 향상을 위하여 리쿠페레이터를 사용하여 시스템 내부에서 열 교환이 일어나며, 시스템의 열을 외부로 추출하기 위하여 가스 쿨러가 사용된다. 또한 시스템 외부로 추출된 열은 래디에이터를 통하여 우주로 방출된다. 500 kW의 전기를 생산하기 위하여 구심터빈과 원심압축기가 사용되며, 시스템의 작동유체는 헬륨-제논 혼합 기체를 사용한다. 시스템 해석 결과 브레이튼 사이클의 열효율은 33%, 래디에이터의 필요 면적은 390 m2로 계산된다. The realm of space is gradually expanding, so manned and unmanned exploration of planets in the solar system, including Mars, is expected to increase. Accordingly, the innovative propulsion systems with a different concept from existing propulsion engines are being studied for manned exploration of Mars. This study is the result of the conceptual design and analysis of the Brayton cycle of a 500 kW nuclear electric propulsion system that can be used for a manned or unmanned Mars exploration vehicle weighing more than 10 tons. The reactor uses UC series low-enriched nuclear fuel of 1511 kW thermal power. To improve system efficiency, heat exchange using a recuperator occurs inside the system, and a gas cooler is used to extract heat, from the system to the outside, which is emitted into space through radiators. A radial turbine and centrifugal compressor are used to produce 500 kW of electricity, and a helium-xenon mixture gas is used as the working fluid of system. As a result of system analysis, the thermal efficiency of the Brayton cycle is calculated to be 33%, and the required surface area of radiators is calculated to be 390 m2.
양수석,송태호,Yang, Soo-Seok,Song, Tae-Ho 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.4
Analytical experiments to determine the line-of-sight temperature distribution is conducted by using spectral radiation intensities. For this study, fourteen narrow bands of $25cm^{-1}$ interval in $CO_2\;4.3{\mu}m$ band ($2,050cm^{-1}$ to $2375cm^{-1}$) are selected. The applied system is a one-dimensional gas slab filled with 100% $CO_2$ gas at 1 atm. Two types of temperature profile are tested; parabolic and boundary layer types. Three kinds of radiation calculation are used in the iteration procedure for the temperature inversion; LBL(Line by Line), SNB(Statistical Narrow Band) and WNB(WSGGM. based Narrow Band) models. The LBL solution shows perfect agreement while some error of temperature prediction is caused by radiation modeling error when using SNB and WNB models. The inversion result shows that the WNB model may be used more accurately in spectral remote sensing techniques than the traditional SNB model.
양수석(Soo-Seok Yang),이대성(Dae-Sung Lee),김승우(Seung-Woo Kim) 한국유체기계학회 1999 유체기계 연구개발 발표회 논문집 Vol.- No.-
Currently under development is an airborne auxiliary power unit with 100 Kw equivalent power, which is composed of a centrifugal compressor, a reverse annular combustor, and a radial turbine. Air-foil bearings are used in this power unit to eliminate the oil supplying system, which can reduce the system complexity and weight. The high speed generator is adopted as an electric power generation and engine starting system, which can also eliminate the reduction gear system. Not only electric power but also pneumatic power is provided by bleeding the compressed air. This power unit is aimed for the multi-purpose use such as a primary power unit in the army weapon system, an auxiliary power and environmental control unit in a next-generation tank, and a smoke generating unit.