• Title/Summary/Keyword: 수소기관

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The Characteristics of Backfire for 2 stroke Free-Piston Hydrogen Fueled Engine with Uni-flow Scavenging (Uni-flow 소기방식 2행정 프리피스톤 수소기관의 스트로크변화에 따른 역화 특성)

  • Cho, Kwan-Yeon;Cho, Hyung-Wook;Lee, Jong-Tae
    • Transactions of the Korean hydrogen and new energy society
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    • v.20 no.5
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    • pp.371-377
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    • 2009
  • Backfire characteristics for hydrogen fueled free piston engine with uni-flow scavenging is investigated with different stroke, exhaust vlave openning timing and fuel-air equivalence ratio by using RICEM (Rapid Intake Compression Expansion Machine) for combustion research of free piston engine. As results, it is found that backfire can be occurred due to slow combustion of unhomogeneous mixture in the piston crevice volume or/and in the cylinder near piston head. And the more stroke of free piston H2 engine with uni-flow scavenging is short the more opening timing of exhaust valve have to be advanced to control backfire.

An Investigation on the Proper Hydrogen Mixing Rate in Heavy-Duty Hydrogen-CNG Engine (수소-천연가스 혼합연료기관의 최적 수소 분사율 검토)

  • LlM, H.S.;KIM, Y.Y.;LEE, JONG T.
    • Transactions of the Korean hydrogen and new energy society
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    • v.15 no.2
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    • pp.89-97
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    • 2004
  • A heavy duty hydrogen enriched CNG engine has the possibility to obtain stable operation at ultra lean condition and to reduce emission extremely. And it can also serve as a so called bridge technology between the current fossil fueled engine and the future hydrogen power system. The emission, torque and brake thermal efficiency characteristics of a heavy-duty hydrogen-CNG engine were investigated to determine the proper mixing rate of hydrogen and CNG. It was found that the proper mixing rates at ${\lambda}=1.4$ and ${\lambda}=1.6$ were around 20% and 30% for hydrogen addition rate respectively.

A Study on the Suitable Compression Ratio of Hydrogen Fueled Engine with Dual Injection (이중분사식 수소기관의 적정압축비에 관한 연구)

  • Kim, Y.Y.;Shin, S.W.;Lee, Jong-T.
    • Proceedings of the KSME Conference
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    • 2001.06d
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    • pp.1001-1007
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    • 2001
  • Hydrogen fueled engine with dual injection can achieve high power and high efficiency simultaneously. In this study, the suitable compression ratio of hydrogen fueled engine with dual injection were investigated including performance of this engine according to variation of compression ratio. As results, it was found that the suitable compression ratio of that was about CR=11, and torque and thermal efficiency increased by 6% and 7% respectively.

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A Study on the Development of Hydrogen Fueled Engine : Heat Loss of Direct Injection Hydrogen Fueled Engine (수소기관 개발을 위한 기초연구(직접분사식 수소기관의 열손실))

  • Nam, Seong Woo;Lee, Jong Tai
    • Transactions of the Korean hydrogen and new energy society
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    • v.5 no.2
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    • pp.111-119
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    • 1994
  • Analysis of heat loss is needed to achieve the high performance and high efficiency in hydrogen engine. So, cooling losses at each part of the direct injection hydrogen fueled engine were measured to evaluate the behavior and distribution of heat loss. Unsteady instantaneous temperature and heat flux at cylinder head were measured by use of instantaneous temperature prove. And these results were compared with those of gasoline engine.

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An Investigation on a Cause of Cycle Variation in Hydrogen Fueled Engine with Direct Injection (직접분사식 수소기관의 사이클변동 원인해석에 관한 연구)

  • Kim, Y.Y.;Lee, Jong T.
    • Transactions of the Korean hydrogen and new energy society
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    • v.13 no.3
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    • pp.233-241
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    • 2002
  • To achieve hydrogen power system with high performance and stable operation, the COVimep of hydrogen fueled engine with direct injection was evaluated with the change of engine speed, injection timing, air-fuel equivalence ratio and spark timing. And the cause of cycle variation was analyzed by using coefficient of variation in combustion period defined in this study. the results showed that the cycle variation of hydrogen fueled engine is mainly dependent on the early combustion period.

A Study on Unsteady Thermal Loading of Hydrogen Engine with Dual Injection (이중분사식 수소기관의 비정상 열부하 해석에 관한 연구)

  • Wei, Shin-Whan;Kim, Yun-Young;Kim, Hong-Jun;Lee, Jong-Tai
    • Transactions of the Korean hydrogen and new energy society
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    • v.12 no.2
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    • pp.147-155
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    • 2001
  • To measure of thermal loading in the combustion chamber of hydrogen engine with dual injection, instantaneous wall-surface temperature and unsteady heat flux of the cylinder head are measured and analyzed. The maximum wall surface temperature is shown in direct injection region which has large heat supplied. Partial and spatial temperatures have slight deviation in transient region of injection, though injection method change suddenly. All of thermal characteristics such as instantaneous temperature, temperature swing and heat flux of hydrogen engine with dual injection are remarkably higher than those of gasoline engine. It means necessity of additional countermeasure of thermal loading.

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An Investigation of Combustion and EmissionCharacteristics in Heavy-Duty Hydrogen-CNG Engine (중대형 수소-천연가스 기관의 수소혼합율 변화에 대한 연소 및 배기특성)

  • LIM, H.S.;KIM, Y.Y.;LEE, J.T.
    • Transactions of the Korean hydrogen and new energy society
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    • v.14 no.3
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    • pp.276-282
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    • 2003
  • A hydrogen enriched CNG engine can be stably operated at ultra lean condition and reduce emission extremely. It also has advantage to increase gradually the use of hydrogen for the coming hydrogen-energy age. In this studies, the combustion and emission characteristics of heavy-duty hydrogen-CNG engine were investigated to verify the enhancement of performance by enriched hydrogen into natural gas. The results showed that a hydrogen-CNG engine could achieve ultra lean operation and low emission, while power was reduced by the decrease of intake air flow.

Extension of Backfire Limited Equivalence Ratio in Hydrogen Engine by Using Multi Point Ignition Method (다점점화에 의한 수소기관의 역화발생 억제효과에 관한 검토)

  • Kim, Y.Y.;Lee, C.W.;Lee, Jongtai
    • Transactions of the Korean hydrogen and new energy society
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    • v.14 no.2
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    • pp.131-137
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    • 2003
  • Backfire occurrence must be controlled for the practical use of hydrogen fueled engine. It was found from preceeding studies that crevice volume around piston rings could effect a backfire occurrence. In this study, a possible countermeasure to backfire occurrence was evaluated by using multi point ignition method around piston ring. The results showed that backfire limited equivalence ratio was increased by a little due to a enhancing effect of mixture combustion around piston crevice volume.

An Analysis on Charateristics of Separate Oiling to Reduce Oil Consumption for a 2 Stroke Free-Piston H2 Engine (오일 소모 저감을 위한 역단류 2행정 프리피스톤 수소기관의 분리 윤활 특성 해석)

  • Byun, Cahng-Hee;Baek, Dae-Ha;Lee, Jong-Tae
    • Transactions of the Korean hydrogen and new energy society
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    • v.22 no.6
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    • pp.794-799
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    • 2011
  • In order to reduce the oil consumption for a 2 stroke free piston hydrogen fueled engine, the behaviors of residual lubricant oil of the cylinder wall surface were visualized and oil mass emitted into exhaust port was measured by using research engine with cross-head and eccentric crankshaft. As the results, it was shown that characteristics of residual lubricant oil such as oil thickness and distribution were remarkably different from a conventional 4 stroke engine. It was also analyzed that these tendencies relied on the configuration and installed position of the exhaust port, piston pin boss and so on.