• Korean Journal of Fisheries and Aquatic Sciences
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• v.9 no.1
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• pp.74-78
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• 1976

In this paper, the author experimented, by using the C. F. R. engine, how the functions of engine is changed when the compression ratio is raised. In the process of these experiments, by using three kinds of fuel, such as cetane number 95, 61, 33, and set the engine speed as 900 r. p. m., fuel injection time is determined as B. T. D. C. $13^{\circ}$. As the result of test, the best compression ratio is disernable in proportion to each fuel, and acknowledges that if the higher compression ratio were to exist other than the above one, efficiency of heat gets rather lower, and that the maximum output of engine decreases. Andthe best compression ratio changed according to supply calorie per each hour, and this change is more remarkable in the fuel of low cetane number. Consequently, the best compression ratio cannot be regardless of output in the fuel of low cetane number.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2002.11a
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• pp.114-115
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• 2002

국내의 경우 자동차 온실가스 배출량은 전체 온실가스의 약 15%를 차지하고 있으며, 국가경제 및 지구대기환경과의 연관성이 크므로 저감대책이 시급히 요구되고 있다. 그러나 현재까지 자동차부문의 온실가스 배출통계는 자료의 미비로 인하여 연료별 배출계수와 연료사용량을 기초로 한 Tier 1 방법에 의하여 작성되었으나, 자동차의 경우 자동차의 종류, 사용연료, 제작년도 및 주행조건뿐만 아니라 운행상태, 적용기술 등에 따라 온실가스 배출량이 크게 좌우된다. (중략)

• Journal of Aerospace System Engineering
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• v.13 no.3
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• pp.9-14
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• 2019

Liquid and solid fuels currently in use have various pros and cons. As a result, researches are dedicated to produce a new form of fuel that utilizes the advantages and overcomes weakness of conventional fuels. In the present study, a new method for making solidified ethanol fuel is introduced, and its preliminary properties and combustion characteristic are observed. The solidified ethanol fuel was made through the production of agarose hydrogel, and its subsequent soaking into pure ethanol. The properties of the solidified ethanol fuel were quantitatively and qualitatively observed, and its validity and applicability discussed.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2000.04a
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• pp.175-178
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• 2000

• 한국신재생에너지학회:학술대회논문집
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• 2010.06a
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• pp.145.2-145.2
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• 2010

탄소복합소재 분리판의 연료전지 성능을 시험하기 위해 소형 고분자연료전지 스택을 제작하였으며 연료전지 운전에 따른 성능변화를 측정하여 탄소복합소재 분리판이 연료전지 스택의 성능에 미치는 영향을 조사하였다. 자체 설계한 가스유로로 디자인된 분리판과 MEA를 적층한 스택의 초기 성능과 장기간 운전에 따른 전압 감소를 측정하였다. 또한 장시간 운전 동안 각 셀의 전압 거동도 함께 측정하였으며 비교를 위해 흑연 분리판을 이용하여 제작한 스택의 성능도 함께 시험하였다. 스택에서 각 셀의 성능은 단위전지에서의 성능과 유사하게 나타나 분리판과 스택의 구조가 셀의 성능을 충분히 보여줄 만큼 적절히 디자인된 것을 알 수 있었으며, 장시간 운전 동안 전류가 증가함에 따라 스택의 성능 감소도 점차 증가하였으며 두 종류의 스택이 유사한 성능 감소를 보여 자체 제작한 탄소복합소재 분리판이 흑연 분리판과 유사한 성능을 보임을 알 수 있었다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2006.11a
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• pp.223-227
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• 2006

In this study, the combustion characteristics was studied with various oxidizer in hybrid propulsion system. In this experiments $GN_2O$ and GOX were used as oxidizer, and PE was used as fuel. The combustion behavior was explained by flame temperature with mass O/F ratio, and the use of $GN_2O$ as the oxidizer caused a increase in combustion efficiency with GOX in the same hybrid motor. The mass flow rate of gaseous oxidizer was controlled by the several chocked orifices that have different diameter, and the oxidizer supply range was $0.0138{\sim}0.0427kg/sec$. As result, the empirical relation for oxidizer type was represented by mass flux of solid fuel, it was obtained with mass transfer number, and mass flux of oxidizer.

• Journal of the Korean Institute of Gas
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• v.25 no.6
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• pp.66-73
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• 2021

In this study, The full load test and WHTC mode test were performed to examine the effect on a heavy duty natural gas engine according to the type of standard gas for certification to check engine performance and exhaust characteristics. Two types of standard gas (G_r, G₂₃) and commercially available natural gas were applied as the fuel used. As a result of the test results of three natural gases with different fuel compositions, G₂₃ with a high nitrogen content was inferior in torque, fuel consumption, and thermal efficiency conditions. In addition, when evaluated in the WHTC mode it was possible to obtain a result that satisfies the EURO VI regulation. However, compared to the other two fuels, the emission characteristics of G₂₃ decreased CO2 and CO, but increased CH4, NOx and PN emissions.

• Journal of the Korean Society of Propulsion Engineers
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• v.26 no.6
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• pp.74-85
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• 2022

Since the late 1990s, the demand for developing green or reduced-toxic storable propellants has been rising to replace the existing toxic propellants. Most of the research activities are focusing on development of new hypergolic fuels and either white fuming nitric acid or hydrogen peroxide is utilized as an oxidizer. The newly-developed hypergolic fuels are classified as three types, catalytic fuel, reactive fuel, and ionic fuel. In the present study, recent R&D trend of ionic liquid propellants is described and the main results in the previous studies are analyzed.

• Transactions of the Korean Society of Automotive Engineers
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• v.2 no.2
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• pp.124-131
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• 1994

자동차엔진의 연소과정에 상사하는 밀폐정적연소실을 주연소실과 대향 2개 부연소실로 분할하고 오리피스로 연결하였다. 이때 부연소실로부터 주연소실로 분출하는 대향분출염 연소에 의한 질소산화물 배출저감특성을 연소방식, 연소실형상 그리고 연료종류를 변경한 수종의 실험으로 조사하였다. 질소산화물농도, 연소실 최고압력, 화염전파과정의 고속도슐리렌사진 가시화를 수행한 결과, 대향분출염 연소방식을 도입하연 연소실의 중앙부공간이 상대적으로 넓은 경우에 고부하운전과 동시에 질소산화물의 배출량도 저감할 수 있었다. 그러나 연료의 종류는 질소산화물생성에 매우 영향이 적었다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2009.05a
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• pp.163-166
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• 2009

For the preparation of Aluminum-slurry fuel, the effects of process parameters on the aluminum dispersion stability in the liquid fuel have been investigated. The dispersion stability of aluminum-slurry fuels could be monitored by measurements through Turbiscan using the scattering of the Laser. Through the application of various additives, TPAB (Tetrapropyl ammonium bromide) showed more reasonable performance than others.