• Title, Summary, Keyword: Specific fuel consumption

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A Study on Efficient Methods of Using Land Engine in the Small Fishing Vessel (소형 어선에서 육상용기관의 효율적인 이용방법에 대한 연구)

  • Lim, J.K.;Cho, S.G.;Hwang, S.J.
    • Journal of Power System Engineering
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    • v.9 no.3
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    • pp.5-9
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    • 2005
  • A study on the performance and exhaust emissions of diesel engine with reducing exhaust gas temperature is performed experimentally. In this paper, experiments are performed at engine speed 2200rpm, 2600rpm and load 0%, 25%, 50%, 75% and 100% by test engine with F.W. cooler passing through exhaust gas. Main measured & analyzed parameters are exhaust gas temperature, specific fuel consumption, NOx and soot emissions etc. The obtained conclusions are as follows. (1) Specific fuel consumption is the least value at load 75% and it is decreased 1.5% after remodeling F.W. cooler. (2) NOx emission is the most value at load 100% and it is increased 30.1% after remodeling F.W. cooler. (3) Soot emission is the most value at load 100% and it is decreased 20.0% after remodeling F.W. cooler.

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Effect of Air-fuel Ratio on Combustion and Emission Characteristics in a Spark Ignition Engine Fueled with Bio-ethanol (공연비 변화가 바이오에탄올 연료 스파크 점화기관의 연소 및 배출물 특성에 미치는 영향)

  • Kim, Dae-Sung;Yoon, Seung-Hyun;Lee, Chang-Sik
    • Transactions of the Korean Society of Automotive Engineers
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    • v.18 no.1
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    • pp.37-43
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    • 2010
  • The purpose of this paper is to investigate the effect of air-fuel ratio on the combustion and emissions characteristics of spark ignition (SI) gasoline engine fueled with bio-ethanol. A 1.6L SI engine with 4 cylinders was tested on EC dynamometer. In addition, lambda sensor and lambda meter were connected with universal ECU to control the lambda value which is varied from 0.7 to 1.3. The engine performance and combustion characteristics of bio-ethanol fuel were compared to those obtained by pure gasoline. Furthermore, the exhaust emissions such as carbon monoxide (CO), unburned hydrocarbon (HC), oxides of nitrogen ($NO_X$) and carbon dioxide ($CO_2$) were measured by emission analyzers. The results showed that the brake torque and cylinder pressure of bio-ethanol fuel were slightly higher than those of gasoline fuel. Brake specific fuel consumption (BSFC) of bio-ethanol was increased while brake specific energy consumption (BSEC) was decreased. The exhaust emissions of bio-ethanol fuel were lower than those of gasoline fuel under overall experimental conditions. However, the specific emission characteristics of the engine with bio-ethanol fuel were influenced by air-fuel ratio.

Estimation of Flight Fuel Consumption Based on Flight Track Data and Its Accuracy Analysis (항적자료를 활용한 항공기 연료 소모량 추정 및 정확도 분석)

  • Park, Jang-Hoon;Ku, Sung-Kwan;Baik, Ho-Jong
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.22 no.4
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    • pp.25-33
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    • 2014
  • As global warming becoming an environmentally serious issue, more attention is drawn to fuel consumption which is the direct source of green house gas emission. The fuel consumption by aircraft operation is not an exception. Motivated by the societal and environmental context, this paper explains a method for estimation of aircraft fuel consumed during their flights as well as the computational process using real flight track data. Applying so-called 'Total Energy Model' along with aircraft specific parameters provided in EUROCONTROL's Base of Aircraft Data (BADA) to aircraft radar track data, we estimate fuel consumption of individual aircraft flown between Gimpo and Jeju airports. We then assess the estimation accuracy by comparing the estimated fuel consumption with the actual one collected from an airline. The computational results are quite encouraging in that the method is able to estimate the actual fuel consumption within ${\pm}6{\sim}11%$ of error margin. The limitations and possible enhancements of the method are also discussed.

A Study on Effect of EGR upon Fuel Consumption Rate and NOx Emission in Diesel Engines (디젤기관의 연료소비율 및 질소산화물 배출물에 미치는 EGR의 영향에 관한 연구)

  • Bae, M.W.;Lim, J.K.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.3 no.1
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    • pp.76-88
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    • 1995
  • The effects of exhaust gas recirculation(EGR) on the characteristics of NOx emissions and specific fuel consumption rate have been investigated using an eight-cylinder. four cycle. direct injection diesel engine operating at several loads and speeds. The theoretical NO formation concentration is calculated with the equivalence ratio as a parameter of flame temperature to study the effect of EGR on NOx emissions in the diesel combustion. The experiments in this study are conducted on the fixed fuel injection timing of $38^{\circ}$ BTDC regardless of experimental conditions. It is found that the specific fuel consumption rate is slightly increased with EGR rate. and NOx emissions are markedly reduced owing to the drop of the incoming oxygen concentratio and the increase of equivalence ratio as the EGR rate increases.

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The Effect of Water Emulsified Fuel on a Motorway-Bus Diesel Engine

  • Park, Kweonha;Kwak, Inseok;Oh, Seungmook
    • Journal of Mechanical Science and Technology
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    • v.18 no.11
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    • pp.2049-2057
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    • 2004
  • In this study, the combustion characteristics and durability of a diesel engine using emulsified fuel was investigated. Water was used in oil type emulsified fuel. In order to understand the effect of emulsified fuel in a wide range of engine running conditions, D-13 mode was selected as a test condition, and a durability test was included to understand the long-term effect of water. Combustion pressure in a cylinder, exhaust emissions, specific fuel consumption, sound level and maximum torque were measured. NOx and PM were simultaneously reduced and the specific fuel consumption was increased and decreased at low and high loads, respectively. There was no trouble and any damage on the parts of the cylinder during a 500 hour durability test.

Emission Characteristics of a Gasoline Engine Using Ethanol Blended Fuel (가솔린 기관의 에탄올혼합연료의 배출가스 특성에 관한 연구)

  • 조행묵;정동화
    • Journal of Advanced Marine Engineering and Technology
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    • v.28 no.3
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    • pp.516-521
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    • 2004
  • In this paper, the effects of ethanol blended gasoline on emissions and their catalytic conversion efficiencies characteristics were investigated in gasoline engine with an electronic fuel injection. The results showed that the increase of ethanol concentration in the blended fuels brought the reduction of THC and $CO_2$ emissions from the gasoline engine. THC emissions were drastically reduced up to thirty percent. And brake specific fuel consumption was increased. but brake specific energy consumption was similar level. However. unburned ethanol and acetaldehyde emissions increased. The conversion efficiency of Pt/Rh based three-way catalysts and the effect of ethanol on CO and NOx emissions were investigated by the change of engine speed. load and air/fuel ratio. Furthermore, the ethanol blended fuel results in the reduction effect of THC. CO and NOx emissions at idle speed.

Combustion and Exhaust Emission Characteristics of Bio-Ethanol Fuel(E100) in SI Engine (SI 엔진에서 바이오에탄올 연료(E100)의 연소 및 배기특성)

  • Ha, Sung-Yong;Lee, Chang-Sik
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.32 no.8
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    • pp.582-588
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    • 2008
  • An experimental investigation was conducted to investigate the effect of Bio-ethanol fuel on the engine performance and exhaust emission characteristics under various engine operating conditions. To investigate the effect of bio-ethanol fuel, the commercial 1.6L SI engine equipped with 4 cylinder was tested on EC dynamometer. The engine performance including brake torque, brake specific fuel consumption, and barke specific energy consumption of bio-ethanol fuel was compared to those obtained by pure gasoline. Furthermore, the exhaust emissions were analyzed in terms of regulated exhaust emissions such as unburned hydrocarbon, oxides of nitrogen, and carbon monoxide.Result of this work shows that the effect of blending of ethanol to gasoline caused drastic decrease of emissions under various operating conditions. Also, improved engine performance such as brake torque and brake power were indicated for bio-ethanol fuel.

A Study on Emission Charncteristics and EGR Application of Blending Fuels with Biodiesel Fuel and Oxygenate Component in a D.I. Diesel Engine (직접분사식 디젤기관에서 바이오디젤유와 함산소성분 혼합연료 적용시 배기배출물 특성 및 EGR의 적용 연구)

  • Choi, Seung-Hun;Oh, Young-Taig
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.2
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    • pp.43-48
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    • 2008
  • The exhaust emissions of diesel engine are recognized as a major cause influencing environment strongly. In this study, the possibility of biodiesel fuel and oxygenated fuel(dimethoxy methane; DMM) was investigated as an alternative fuel for a naturally aspirated direct injection diesel engine. The smoke emission of blending fuel(biodiesel fuel 90vol-%+DMM 10vol-%) was reduced approximately 70% at 2500rpm, full load, in comparison with the diesel fuel. But, power, torque and brake specific energy consumption showed no significant differences. But, NOx emission of biodiesel fuel and DMM blended fuel increased compared with commercial diesel fuel due to the oxygen component in the fuel. It was needed a NOx reduction counterplan that EGR method was used as a countermeasure for NOx reduction. It was found that simultaneous reduction of smoke and NOx emission was achieved with BDF(95 vol-%) and DMM(5 vol-%) blended fuel and cooled EGR method(15%).

Application of Main Engine Turbocharger Cut-Out System Onboard a Vessel (Main Engine Turbocharger Cut-Out System 실선 적용 사례)

  • Cho, In-Young;Lee, Dong-Yeub;Kim, Young-Keon
    • Special Issue of the Society of Naval Architects of Korea
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    • pp.36-38
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    • 2011
  • As the increase of the fuel oil price, the demand for saving of the ship running cost is growing. To meet the needs of the shipowners, the method for low load operation has been developed by engine licenser. As one of low load operation, the turbocharger cut-out system can be utilized flexibly both full and part load operation. It can be possible to optimize fuel consumption at both full and part load operation. Tests by engine licenser with 12K98MC engine have proven that the fuel oil consumption can be reduced approximately 5%. In this paper we will study the application of main engine turbocharger cut-out system onboard a vessel. One of four turbochargers with MAN Diesel & Turbo 12K98MC-C and 12K98ME-C engine is cut out with swing gate valve. The fuel oil consumption is measured during sea trial and engine shop test.

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