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김근식,조혁진,백선기,서중규,지상연,서희준,박성욱,문귀원 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.11
한국항공우주연구원에서는 진공 챔버를 활용하여 Military Standard 801G:2014 문서의 500.6 방법에 따른 고도 시험을 수행하고 있다. 해당 규격에서 요구하는 고도변화율(10 m/s 이하) 만족을 위한 챔버 내부 압력 조절 방법으로, 진공 펌프를 이용하여 챔버 내부 진공도를 낮추는 동시에 가스 공급용 수동밸브의 개도를 적절히 조절하는 방법을 적용해 왔다. 작업자의 숙련도에 영향을 받는 수동 밸브 조작에 따른 시험 조건의 비균일성과 재현성 확보의 어려움을 해결하기 위해서, 밸브의 개도와 고도 상승률, 고도 하강률의 상관관계를 실험을 통해 얻어 내고, 이를 자동 유량 조절 밸브 제어 로직에 적용하여 고도시험의 자동화를 구현하였다. 자동화 구현 이후의 검증 실험을 통하여, 규격이 요구하는 시험 조건을 정확하게 구현할 수 있음을 확인하였다. Altitude test following the method 500.6 of military standard document 801G:2014 has been performed at Korea Aerospace Research Institute (KARI) using a vacuum chamber. In order to satisfy the altitude increasing rate requirement of less than 10 m/s of the document, KARI has applied the process to decrease the chamber pressure using a vacuum pump, and to supply gas into the chamber by manual valve manipulation simultaneously. The manual valve control has been affected by operator’s proficiency, so test repeatability was not guaranteed. The relation between valve opening and altitude increasing rate, altitude decreasing rate was found by the experiments, and the obtained equations were applied to the control logic of the remote mass flow controller, The altitude test performance was successfully verified by the final validation test.
김중일(Joongil Kim),고민호(Minho-Ko),김이중(Leejung Kim),서중규(Jungyu Seo),김형육(Hyungyuk Kim),김유(Yoo Kim),고영성(Youngsung Ko) 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.12
본 논문에서는 예비설계를 통한 고공환경모사 시험설비의 각 파트별 냉각수 공급시스템의 요구유량을 제시하였으며 요구유량에 따라 펌프식 및 가압식으로 나누어 냉각수 공급시스템을 설계ㆍ제작하였다. 펌프식 냉각수 공급시스템 및 가압식 냉각수 공급시스템의 cavitation venturi 검증실험을 통해 안정한 냉각수 유량을 공급할 수 있음을 확인하였다. In this paper, mass flow rate of a cooling water supply system was presented through preliminary design of high-altitude test facility(HATF). The cooling water supply system consisted of pressurization and pump type to satisfy flow rate requirements. Hydraulic tests were performed to verify mass flow rate of cooling water. The experimental result showed that the cooling water supply system could supply accurate mass flow rate to each part by cavitation venturies.
KSTAR PFCs N₂ gas Baking System 설계 및 운전 결과
김상태(Sang-Tae Kim),정남용(Nam-Yong Jung),김영진(Young-Jin Kim),김이중(Lee-Jung Kim),김성기(Seong-Gi Kim),서중규(Jung-Gyu Seo),김양수(Yang-Su Kim) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.11
PFCs N₂ gas baking system is close loop system and consists of a compressor(N₂ gas), a electric heater, a pre-cooler(gas vs gas), a cooler(gas vs water), a vacuum pump, etc. The system has following characteristics. 1) Because the compressor in a close loop system can not be operated at 400℃, the cooler was installed at its suction piping in order to keep its suction gas temperature below 150℃. 2) Pre-cooler, Pre-heater, constructed at cooler's suction piping in order to transfer a heat of return gas to a supply gas. 3) This system was performed a N₂ gas flow simulation for distribution optimized into PFCs and piping stress analysis in design step, and the results were applied a construction of the system. A by-pass operation in PFCs was conducted to 400℃, and PFCs baking operation was carried out to 200℃ for stability of other devices. This paper describes design of PFCs gas baking system, operating, problem & solution, results of commissioning.
고온 환경에서의 KSTAR PFC N₂ gas baking system의 자재성능실험
김영진(Young-Jin Kim),김상태(Sang-Tae Kim),정남용(Nam-Yong Jung),김이중(Lee-Jung Kim),김성기(Seong-Gi Kim),서중규(Jung-Gyu Seo),김양수(Yang-Su Kim) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
KSTAR(Korea Superconducting TOKAMAK Advanced Research) PFC(Plasma Facing Component) N₂ gas baking system is a facility that circulates and heats nitrogen gas till 350℃ in order to heat the PFC installed in vacuum vessel of KSTAR. In this paper we discussed the test results about the strength stability of piping support and the insulating performance of insulator via the measurement of their surface temperatures, and the sealing performance of test valves through the leak test of the stem's packing, the bonnet's gasket and the disc's seat at 300℃, 160℃, 10℃ respectively.