• Title/Summary/Keyword: Natural Gas Engine

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Combustion Characteristics of Pre-mixed Charge Compression Ignition Engines with Natural Gas Applied to 4-Cylinders Diesel Engine (4기통 디젤기관에 적용한 천연가스 예혼합 압축착화 기관의 연소특성)

  • Jung, S.H.
    • Journal of Power System Engineering
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    • v.13 no.2
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    • pp.5-10
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    • 2009
  • In recently, studies concerned to the diesel engine uses a natural gas as a fuel oil whose infra has been built already was approached to PCCI or HCCI with keeping a high thermal efficiency and reducing NOx and PM have been researching actively in normally single cylinder. An ignition source is required to bum the natural gas by a spark plug in gasoline engines, due to a higher auto-ignition temperature of natural gas. Then gas oil and DME were introduced as the ignition source. In this study as basic data for practical use of natural gas PCCI and HCCI engines, combustion characteristics and emission characteristics on 4-cylinders natural gas PCCI and HCCI engines with gas oil and DME as ignition sources were analyzed and the engine load range that is main object for practical use of PCCI and HCCI engines was made clearly by empirical experiment.

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Evaluation on the Characteristics of Liquefied Natural Gas as a Fuel of Liquid Rocket Engine

  • Namkoung, Hyuck-joon;Han, Poong-Gyoo;Kim, Kyoung-Ho
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2004.03a
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    • pp.148-154
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    • 2004
  • As a rocket propellent of hydrocarbon fuels, the characteristics of liquefied natural gas was evaluated with the viewpoint of the constituents and content, the cooling performance as a coolant, and characteristic velocity and specific impulse as parameters of the engine performance. Content of methane was a principal factor to determine the characteristics as a rocket propellant and more than 90 % of it was needed as a fuel and coolant in the regenerative cooled liquid rocket engine. Some constituents of the liquefied natural gas can be frozen by the pre-cooling of the pipe lines, therefore they can be a factor disturbing the normal working of engine. In case the content of methane is around 90% in the liquefied natural gas, a normalized stoichiometric O/F mixture ratio of 0.75 is suggested for a nominal operation condition to get the maximum specific impulse and characteristic velocity.

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The Comparison of Performance and Emission Characteristics between CNG Engine and Gasoline Engine (천연가스 전소엔진과 가솔린엔진의 성능과 배출가스 특성비교)

  • 김진영;박원옥;정성식;하종률
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.2
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    • pp.16-21
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    • 2003
  • Natural gas is one of the promising alternative fuels because of the abundant deposits and the cleanness of emission gas. It can be used in conventional gasoline engine without major modification. Natural gas has some advantages than gasoline i.e. the high octane number, good mixing condition because of gas and wide inflamable limit. In the present study, a $1.8{\ell}$ conventional gasoline engine is modified for using the CNG as a fuel instead of gasoline. Performance and emission characteristics are compared between gasoline and CNG with 4 cylinder SI Engine which is controlled by programable ECU. Parameters of experimentation are equivalence ratio, spark timing and fuels. We analyzed the combustion characteristics of the engine using the cylinder pressure i.e. ignition delay, combustion duration and cycle variation. As a result, CNG engine shows lower exhaust emissions but brake torque is slightly reduced compared to gasoline engine. Overall combustion duration is longer than that of gasoline because of lower burning speed.

An Experimental Study on Performance and the Exhaust Emissions in a Small High Speed Gas Engine by Using Natural Gas and Hydrogen Fuel (천연가스 및 수소연료를 사용하는 소형 고속 가스엔진에 있어서 성능 및 배기 특성)

  • Kim B.S.;Shioji M.;Chu B. G.
    • Journal of the Korean Institute of Gas
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    • v.4 no.2 s.10
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    • pp.20-26
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    • 2000
  • In this experimental study, we examined gas engine characteristics of a small high-speed engine in various ways. And we studied performance of natural gas, hydrogen gas and gasoline fuel engines, as emission characteristics and process of combustion. For the purpose of preventing back-fire occurred in case of high-speed and high load in hydrogen engine, we controlled air quantity by installing throttle valve in gas fuel engine. We performed experiment by mixing nitrogen to hydrogen fuel. As a result, we could find out characteristics which of a high speed small engine by applying gas fuels.

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EFFECT OF DI-TERTIARY-BUTYL PEROXIDE ON IGNITION PERFORMANCE IN A COMPRESSION IGNITION NATURAL GAS ENGINE

  • Li, F.C.;Zheng, Q.P.;Zhang, H.M.
    • International Journal of Automotive Technology
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    • v.8 no.4
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    • pp.413-419
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    • 2007
  • Experimental study of additives on the ignition performance of a compression ignition natural gas engine is introduced, followed by results of a simulation of its working mechanism. From the experimental results, it is understood that engine ignition performance can be improved when a certain amount of Di-tertiary-butyl peroxide additive is added. If the mass fraction of Di-tertiary-butyl peroxide additive reaches as high as 14.2%, engine ignition can be realized at ambient temperatures with a glow plug temperature of about $750^{\circ}C$. From the simulation results, we verify that the Di-tertiary-butyl peroxide additive, by cracking its radicals at lower temperature, can accelerate reaction rate. Therefore, the additive is able to improve the ignition performance of natural gas significantly.

NUMERICAL ANALYSIS OF FUEL INJECTION IN INTAKE MANIFOLD AND INTAKE PROCESS OF A MPI NATURAL GAS ENGINE

  • XU B. Y.;LIANG F. Y.;CAI S. L.;QI Y. L.
    • International Journal of Automotive Technology
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    • v.6 no.6
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    • pp.579-584
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    • 2005
  • Unsteady state free natural gas jets injected from several types of injectors were numerically simulated. Simulations showed good agreements with the schlieren experimental results. Moreover, injections of natural gas in intake manifolds of a single-valve engine and a double-valve engine were predicted as well. Predictions revealed that large volumetric injections of natural gas in intake manifolds led to strong impingement of natural gas with the intake valves, which as a result, gave rise to pronounced backward reflection of natural gas towards the inlets of intake manifolds, together with significant increase in pressure in intake manifold. Based on our simulations, we speculated that for engines with short intake manifolds, reflections of the mixture of natural gas and air were likely to approach the inlets of intake manifolds and subsequently be inbreathed into other cylinders, resulting in non-uniform mixture distributions between the cylinders. For engines with long intake manifolds, inasmuch as the degrees of intake interferences between the cylinders were not identical in light of the ignition sequences, non-uniform intake charge distributions between the cylinders would occur.

The use of liquefied petroleum gas (lpg) and natural gas in gas turbine jet engines

  • Koc, Ibrahim
    • Advances in Energy Research
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    • v.3 no.1
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    • pp.31-43
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    • 2015
  • This paper compares the performance of JP-8(Jet Propellant) fuel and liquefied petroleum gas (LPG) and natural gas in the F110 GE100 jet engine. The cost of natural gas usage in gas turbine engines is lower than JP-8 and LPG. LPG cost is more than JP-8. LPG volume is bigger than JP-8 in the same flight conditions. Fuel tank should be cryogenic for using natural gas in the aircraft. Cost and weight of the cryogenic tanks are bigger. Cryogenic tanks decrease the move capability of the aircraft. The use of jet propellant (JP) is the best in available application for F110 GE 100 jet engine.

The Effect of Fuel Injection Timing on the Combustion and Emission Characteristics of a Natural Gas Fueled Engine at Part Loads

  • Cho, Haeng-Muk
    • Journal of Advanced Marine Engineering and Technology
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    • v.32 no.7
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    • pp.1013-1018
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    • 2008
  • For a sequential port fuel injection natural gas engine, its combustion and emission characteristics at low loads are crucial to meet light duty vehicle emission regulations. Fuel injection timing is an important parameter related to the mixture formation in the cylinder. Its effect on the combustion and emission characteristics of a natural gas engine were investigated at 0.2 MPa brake mean effective pressure (BMEP)/2000 rpm and 0.26 MPa BMEP/1500 rpm. The results show that early fuel injection timing is beneficial to the reduction of the coefficient of variation (COV) of indicated mean effective pressure (IMEP) under lean burn conditions and to extending the lean burn limits at the given loads. When relative air/fuel ratio is over 1.3, fuel injection timing has a relatively large effect on engine.out emissions. The levels of NOx emissions are more sensitive to the fuel injection timing at 0.26 MPa BMEP/1500 rpm. An early fuel injection timing under lean burn conditions can be used to control engine out NOx emissions.

Performance and Emission Characteristics of GHP Engine at Different Natural Gas Heating Value (천연가스 열량 변화에 따른 GHP 엔진의 성능 및 배출가스 특성)

  • Lee, Joongseong;You, Hyunseok;Choi, Jeonghwan;Choi, Euikwang;Lee, Kyungho;Lee, Byungdae
    • Journal of the Korean Institute of Gas
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    • v.19 no.1
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    • pp.1-5
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    • 2015
  • In general, natural gas is used as GHP(Gas Engine Driven Heat Pump) fuel. On this study, the influences of different natural gas heating value on GHP were evaluated. As a result of engine test & field test using low heating value gas($9,800kcal/Nm^3$) as fuel, the engine power was reduced slightly, however the performance of start-up, the stability of operation and the characteristics of emission gas were almost similar. So it is considered that the normal operation of GHP is possible without any tuning when the low heating value($9,800kcal/Nm^3$) of natural gas was used as fuel.

A study on power improvement emission characteristics of marine diesel engine with response power 200HP turbocharger (대응출력 200마력 과급기에 의한 디젤기관의 출력향상 및 배출특성에 관한 연구)

  • Lee, Chi-Woo
    • Journal of Advanced Marine Engineering and Technology
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    • v.38 no.1
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    • pp.23-30
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    • 2014
  • To improve efficiency of diesel engine which requests high output recently and is used all kinds of industrial areas, this thesis experimented dynamic characteristics and exhaust gas characteristics of diesel engine installed by supercharger of correspondent output 200HP and natural inhalation diesel engine through the dynamometer and exhaust gas analyzer in same condition. As the result of experiment with natural inhalation diesel engine and diesel engine installed by supercharger, there were a few differences of output, but dynamic characteristics at high speed showed increased output and efficiency of the engine installed by supercharger. On the contrary, in exhaust gas characteristics, the model installed by supercharger showed increased exhaust gas such as $NO_X$, $O_2$, etc, but added value of exhaust gas is low if considering $CO_2$ reduction and efficiency of dynamic characteristic's increase. Based on the results, diesel engine installed by supercharger is expected to show higher economic feasibility than natural inhalation diesel than natural inhalation engine from an angle of efficiency. Keywords: 200hp class Turbocharger, Exhaust Gas, Engine Performance, Marine Diesel Engine.