• Journal of the Korean Society of Propulsion Engineers
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• v.23 no.6
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• pp.51-58
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• 2019

In this study, a set of performance tests on 3D-printed combustor components were carried out to investigate the performance of 3D-printed component and its feasibility for micro gas turbine engines. The test were conducted for four different equivalence ratios under two different engine operating conditions. The measurement results show that the tested combustor had a low total pressure loss coefficient and a uniform exit temperature distribution. However, the combustion efficiency values are less than 93.5% owing to the large amount of UHC and CO, which is considerably lower than a typical gas turbine engine combustor. The performance data obtained from the tests will be used for combustor performance improvements using 3D-printing technology.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2008.11a
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• pp.133-136
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• 2008

The present study presents experimental results of combustion tests of a fuel-rich gas generator associated with a turbopump. Five combustion tests had been successfully executed. Static pressures of the gas generator promptly reacted to propellant supply variations from the turbopump. A closed-loop test for driving the turbopump revealed no flaw. Exit gas temperature results are very similar to previous ones. An orifice was effective on the suppression of pressure fluctuations although tests conducted below 45 bar showed the same dynamic behaviour as that of component-only tests.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1554-1555
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• 2011

안정적인 전력공급을 위해 전력설비 진단이 중요시 되고 있고 이를 위해 변전기기인 변압기의 초기고장 검출을 통한 예방진단 기술을 필요로 하고 있다. 변압기 예방진단 기술 중에서도 유중가스진단은 가장 오래되고 신뢰성이 입증된 기술이다. 기존의 유중가스진단법들은 가스비분석법을 이용하고 있는데 대상 가스들이 절연유에의 열화에 의해 발생하는 가스들이고 주위 운전환경에 대한 고려가 부족하여 진단이 불가능하거나 진단오류가 발생한다. 본 연구에서는 절연유뿐만 아니라 고체절연물에 대한 열화를 고려하기 위하여 변압기 내부 결함 모의 시험 쳄버를 제작하고 시험 결과를 바탕으로 진단 알고리즘을 개발하고자 한다.

• JOURNAL OF ELECTRICAL WORLD
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• s.313
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• pp.75-80
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• 2003

에너지와 환경을 조화시킨 자원순환형 사회의 실현을 위해 하수처리장에서도 하수열이나 소화가스 등의 미이용(未利用)네어지의 유효활용이 기대되고 있다. 소화가스는 하수처리장에서 발생하는 에너지 중에서는 큰 비중을 차지하고 있으나 소화조의 가온을 위해 사용되고 있는 정도로 반드시 유효하게 활용되고 있다고는 말할 수 없다. 또 가스엔진의 코제너레이션에 의해 유효하게 할용되고 있는 처리장도 있으나 메인터넌스 비용 등의 문제로 보급되고 있지 않은 것이 실제의 상황이다. 한편, 마이크로가스터빈은 그 구조의 심풀성 때문에 가스엔진과 비교하여 메인터너스 비용의 저감이 기대되고 있어, 소화가스를 연료로 하는 코제너레이션 시스템으로서 앞으로의 보급이 기대되는 발전시스템이다. 그래서 소화가스의 마이크로가스터빈용 연료로서의 적용을 위한 검증과 운영상의 과제를 밝힐 것을 목적으로 북견시 정화센터의 처리장 내에 설치하여 실증시험을 하고 있다. 지금까지 약 4,000시간의 운전실적에서 소화가스에 기인하는 본질적인 문제도 없고 시스템이 안정되게 동작하는 것을 확인하였다. 또한 실증시험설비에는 마이크로가스터빈의 운전상태를 24시간 리모트 감시하는 리모트감시장치를 설치하고 있는데, 운전데이터의 파악과 이상 발생시의 고장진단/기술검토에 유효하게 사용되었다.

• LP가스
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• v.20 no.2
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• pp.59-67
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• 2008

지난 4월 2일 GAS KOREA 2008 전시회가 개최된 서울무역전시장에서 '한국DME협회 분과발표회'가 열렸다. 이날 분과발표회에서는 'DME Demo 플랜트 현황소개(한국가스공사 연구 개발원 조원준 박사 "DME 연료실증, 시험연구 사업현황(한국가스공사 연구개발원 백영순 박사)" 커먼레일형 연료공급계를 탑재한 2리터급 DME 차량개발(자동차 부품연구원 정재우 박사) "급속압축장치를 이용한 불균일 예혼합기의 DME HCCI연소 과정에 관한 연구(울산대학교 임옥택 교수) DME의 자착화 측정 및 세탄가의 추정(인하대학교 이대엽교수)" 직접분사식 압축착화기관에서 DME연료의 분무미립화 및 배출물 특성(한양대학교 이창식 교수)' 에 대한 발표도 이뤄졌다.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2009.11a
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• pp.147-148
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• 2009

FT-IR 가스분석기를 활용한 섬유제품의 암모니아가스에 대한 소취성 시험법 개발을 위한 연구로서 직물의 시료 크기는 지름 200mm, 순환가스의 양은 분당 8리터로 정하였으며, 분석온도는 40도씨이상, 암모니아가스의 농도는 200ppm이상, 분석시간은 2시간이상 측정하는 것이 타당한 것으로 나타났다.

• Journal of the Korean Applied Science and Technology
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• v.35 no.4
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• pp.1108-1119
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• 2018

As the interest on the air pollution is gradually rising at home and abroad, automotive and fuel researchers have been studied on the exhaust and greenhouse gas emission reduction from vehicles through a lot of approaches, which consist of new engine design, innovative after-treatment systems, using clean (eco-friendly alternative) fuels and fuel quality improvement. This research has brought forward two main issues : exhaust emissions (regulated and non-regulated emissions, PM particle matter) and greenhouse gases of vehicle. Exhaust emissions and greenhouse gases of automotive had many problem such as the cause of ambient pollution, health effects. In order to reduce these emissions, many countries are regulating new exhaust gas test modes. Worldwide harmonized light-duty vehicle test procedure (WLTP) for emission certification has been developed in WP.29 forum in UNECE since 2007. This test procedure was applied to domestic light duty diesel vehicles at the same time as Europe. The air pollutant emissions from light-duty vehicles are regulated by the weight per distance, which the driving cycles can affect the results. Exhaust emissions of vehicle varies substantially based on climate conditions, and driving habits. Extreme outside temperatures tend to increasing the emissions, because more fuel must be used to heat or cool the cabin. Also, high driving speeds increases the emissions because of the energy required to overcome increased drag. Compared with gradual vehicle acceleration, rapid vehicle acceleration increases the emissions. Additional devices (air-conditioner and heater) and road inclines also increases the emissions. In this study, three light-duty vehicles were tested with WLTP, NEDC, and FTP-75, which are used to regulate the emissions of light-duty vehicles, and how much emissions can be affected by different driving cycles. The emissions gas have not shown statistically meaningful difference. The maximum emission gas have been found in low speed phase of WLTP which is mainly caused by cooled engine conditions. The amount of emission gas in cooled engine condition is much different as test vehicles. It means different technical solution requires in this aspect to cope with WLTP driving cycle.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2009.11a
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• pp.38-41
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• 2009

For the technology development of LOx/kerosene liquid rocket engine, turbopump-gas generator closed-loop coupled tests using 30tonf main engine components such as turbopump and gas generator except combustion chamber are performed. In the engine system operation environment, simulating combustion chamber by flow control units, the chill-down procedure, startup characteristics, nominal operability and smooth shutdown of turbopump+gas generator closed-loop coupled Test Plant are successfully confirmed. The serviceability of the turbopump and gas generator are evaluated. The feed-back control system for the turbopump rotational speed and gas generator mixture ratio are also verified. The results of closed-loop coupled test will be used as the technology development for the liquid rocket engine.

• Journal of the Korean Applied Science and Technology
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• v.29 no.1
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• pp.129-140
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• 2012

Smoke toxicity is the test for the toxicity evaluation of smoke and hazardous gas, caused by combustion of building materials and finishing materials. Smoke toxicity can be evaluated by the mean incapacitation time of mice. This test result can be influenced by the health status of mice and test condition. In acute inhalation toxicity test of hazardous gas, no typical clinical findings and histopathologic abnormalities were observed. Tracheitis and bronchitis as well as acute lung inflammation around terminal bronchiole in some mouse of the highest dose group. Through this study, we established the method for inhalation toxicity test of hazardous gas as well as the SOP of inhalation toxicity test. However, in the future studies, the concentration control methods for inhalation technologies on hazardous gas will be needed to improve continuously and also further studies on other gas inhalation toxicity will be needed to conduct.

• LP가스
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• v.21 no.5
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• pp.38-48
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• 2009

한국가스안전공사에 설치된 가스기술기준위원회 사무국에서는 기존 가스기술기준의 성능에 대한 상세한 규격, 시험방법 등 기술적 사항들을 분야별로 집대성한 KGS Code 특별회원제를 운영하고 있습니다. 관련내용을 안내해드리오니 업무에 참고하시기 바랍니다.