• Title, Summary, Keyword: Specific fuel consumption

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Numerical study on effect of intake valve timing on characteristics of combustion and emission of Natural gas-Diesel engine (발전용 천연가스-디젤 혼소 엔진의 흡기밸브 개폐시기에 따른 연소 및 배출 특성에 대한 수치 해석적 연구)

  • Jung, Jaehwan;Song, Soonho;Hur, Kwang beom
    • Journal of Energy Engineering
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    • v.25 no.2
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    • pp.29-36
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    • 2016
  • In this study, diesel/natural gas dual-fuel engine was studied numerically using DoE method. The engine is CI engine for power generation and modelled by 1-D simulation GT-power. The combustion and emission characteristics were analyzed as a function of IVO, IVC and the ratio of natural gas to total fuel enegy. As the proportion of natural gas increases, the BSFC(Brake specific fuel consumption) is increased and BSNOx(Brake specific NOx) is decreased. If specific valve timing to improve the BSFC is applied to the engine, the BSFC is decreased by 1% and simultaneously BSNOx is decreased by 36%.

Effects of Suction Air Humidity on the Combustion and Exhaust Emissions Characteristics in Diesel Engine (디젤기관에 있어서 흡기습도 변화가 연소 특성과 배기배출물 특성에 미치는 영향)

  • 임재근;김동호
    • Journal of Advanced Marine Engineering and Technology
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    • v.24 no.4
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    • pp.421-426
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    • 2000
  • A study on the combustion and exhaust emissions characteristics of diesel engine with various suction air humidity is performed experimentally. In this paper, suction air humidity is changed from RH 50% to RH 90%, the experiments are performed at engine speed 1800rpm, and main measured parameters are cylinder pressure, fuel consumption rate, CO, HC, NOx and Soot emissions etc. Increase of suction air humidity from RH 50% to RH 90% does not effect specific fuel consumption, decreases maximum pressure in cylinder, ratio of maximum pressure rise and net heat release, and delays ignition timing. Also, that increases CO and HC emissions, decreases NOx emissions, but does not constant in changing tendency on emission.

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Effect of Ultrasonic Energy in the Engine using Diesel Fuel Blended Rape-seed Oil (유채혼합유를 사용하는 기관에서 초음파에너지의 영향)

  • Kwon, K.R.;Ko, K.N.
    • Journal of Power System Engineering
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    • v.9 no.4
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    • pp.5-10
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    • 2005
  • The effect of ultrasonic energy for diesel fuel and blend oil has been revealed in this paper. The experimental setup consisted of a high speed diesel engine with 4 cylinder, dynamometer and ultrasonic fuel feeding system. Ultrasonic energy was added to diesel fuel and blend oil, which is a blend of diesel fuel and rape-seed oil. As engine speed was changed, engine torque and power, brake specific fuel consumption and thermal efficiency were measured in detail. As the results, by adding ultrasonic energy to diesel fuel and blend oil, the engine performance was improved in range of the experiment. The effect of improvement on brake specific fuel consumption and thermal efficiency for blend oil is higher than that for diesel fuel. When ultrasonic energy was added to diesel fuel or blend oil, a rise in engine torque for diesel fuel was higher than that for blend oil, but the effect of ultrasonic energy was small. From these results, it may be desirable to add ultrasonic energy to blend oil for the use of blend oil to diesel engine.

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Improving the performance of a Medium Speed Diesel Engine Using Miller Cycle (Miller 사이클을 이용한 중형 디젤 기관 성능 개선)

  • 김동훈;김기두;하지수;김호익;김주태
    • Journal of Advanced Marine Engineering and Technology
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    • v.26 no.2
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    • pp.248-255
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    • 2002
  • Miller cycle was studied and analyzed by engine performance simulation to achieve very low fuel consumption and to meet the IMO NOx regulation on a medium speed diesel engine. Based on the performance simulation results the intake valve closing time for HYUNDAI HiMSEN 6H21/32 engine was set at 0deg.ABDC(After Bottom Dead Center). Also, the simulation results indicated that significant NOx reduction could be achieved with low reduction of fuel consumption. The performance simulation investigated the effect of compression ratio and turbocharger on fuel consumption and NOx concentration in combination with Miller cycle. The results indicated a significant reduction of fuel consumption with keeping NOx concentration. The results of performance simulation were compared with measured data to verify simulation results. The comparison showed the maximum error was 2.34% in exhaust temperature. Also, the experimental result showed that improvement in BSFC(Brake Specific Fuel Consumption) was 5.8g/kwh with keeping NOx level similar to simulation result.

A Study on Performance Characteristics in a LPG Fueled Engine (LPG 연료기관의 성능특성에 관한 연구)

  • Cho, K.H.;Baek, T.S.;Paek, Y.;Lee, J.T.
    • Journal of Advanced Marine Engineering and Technology
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    • v.25 no.6
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    • pp.1203-1210
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    • 2001
  • This study was carried out to develop an engine for off-road vehicles especially for farm tractors using the liquefied petroleum gas (LPG) which is known as a source of energy having good potential of substitute fuel for diesel engine because of its economical advantage and low pollutant materials after combustion. The study was focused on develop an engine of high in specific power output, low in specific fuel consumption and emission of pollutants. A series of teat was dope on the engine - various laboratory tests to analyze performance of the engine and actual field tests with the engine installed on a farm tractor as a power source.

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Fuel Economy Comparison according to Driving Mode Conditions of the Internal Combustion Engine Vehicles (내연기관 자동차의 주행모드 조건에 따른 연비 성능 비교)

  • Choi, Yongjun;Seo, Youngho
    • Journal of Institute of Convergence Technology
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    • v.3 no.1
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    • pp.25-29
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    • 2013
  • The purpose of this paper is to determine the fuel change and weight change impact on the fuel economy and emission characteristic of ICE (Internal Combustion Engine) vehicle. According to fuel type, fuel consumption and emission characteristics were measured and fuel used in this paper was gasoline, diesel, and LPG. Four vehicles with different weight were tested and the fuel economy were compared and analyzed by using scatter graph. Test was carried out using chassis dynamometer, CVS (Constant Volume Sampler), and emission measurement system. Diesel vehicle less emited $CO_2$ compared to gasoline and LPG. Even if same $CO_2$ between gasoline and LPG, there are difference fuel economy depending on carbon proportion of specific fuel. The heavier weight of vehicle, the worse of fuel economy and Better fuel economy performance on highway driving mode.

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A Study on the Characteristics of Exhaust Emissions by Biodiesel Blend Waste Oil in Marine Diesel Engine (선박디젤기관에서 바이오디젤 폐혼합유의 배기배출물특성에 대한 연구)

  • Cho, Sang-Gon
    • Journal of Power System Engineering
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    • v.19 no.2
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    • pp.90-95
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    • 2015
  • Recently worldwide concern and research is being actively conducted on green energy which can reduce environmental pollution. A plant such as the natural rapeseed oil, soybean oil, palm, etc. is used as a bio source in home and industry. Biofuels is a sustainable fuel having economically benefits and decreasing environmental pollution problems caused due to fossil fuel, and it can be applied to the conventional diesel engine without changing the existing institutional structure. Waste vegetable oil contains a high cetane number and viscosity component, the low carbon and oxygen content. A lot of research is progressing about the conversion of waste vegetable oil as renewable clean energy. In this study, waste oil was prepared to waste cooking oil generated from the living environment, and applied to diesel engine to confirm the possibility and cost-effectiveness of biodiesel blend waste oil. As a result, brake specific fuel consumption and NOx was increased, carbon monoxide and soot was decreased.

Effect of Ethanol-gasoline Blending Ratio on Lean Combustion and Exhaust Emissions Characteristics in a SI Engine Fueled with Bioethanol (바이오에탄올 SI 엔진에서 에탄올-가솔린 연료 혼합비율에 따른 희박연소 및 배기 특성)

  • Yoon, Seung-Hyun;Kim, Dae-Sung;Lee, Chang-Sik
    • Transactions of the Korean Society of Automotive Engineers
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    • v.19 no.1
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    • pp.82-88
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    • 2011
  • Lean combustion and exhaust emission characteristics in a ethanol fueled spark-ignited engine according to ethanol-gasoline fuel blending ratio were investigated. The test engine was $1591cm^3$ and 10.5 of compression ratio SI engine with 4 cylinders. In addition, lambda sensor system was connected with universal ECU to control the lambda value which is varied from 1.0 to 1.5. The engine performance and lean combustion characteristics such as brake torque, cylinder pressure and rate of heat release were investigated according to ethanol-gasoline fuel blending ratio. Furthermore, the exhaust emissions such as carbon monoxide (CO), unburned hydrocarbon (HC), nitrogen oxides ($NO_x$) and carbon dioxide ($CO_2$) were measured by emission analyzers. The results showed that the brake torque, cylinder pressure and the stability of engine operation were increased as ethanol blending ratio is increased. Brake specific fuel consumption (BSFC) was increased in higher ethanol blending ratio while brake specific energy consumption (BSEC) was decreased in higher ethanol blending ratio. The exhaust emissions were decreased as ethanol blending ratio is increased under overall experimental conditions, however, some specific exhaust emission characteristics were mainly influenced by lambda value and ethanol-gasoline fuel blending ratio.

A Study on Combustion And Exhaust Emissions of Diesel Engine -For Gas Oil-Water Emulsified Fuel- (디젤 기관의 연소와 배출물에 관한 연구 -경유-물물의 유화연료 사용시-)

  • 조진호;김형섭;박정률
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.1
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    • pp.180-188
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    • 1992
  • By means of the compatibility according to solving environmental pollution and energy problem due to the emissions of NOx and smoke from diesel engine this paper experimentally inspected the effect of using emulsified fuel, gas oil-water, for combustion characteristic, that is combustion pressure, pressure rise rate, heat generating rate, the period of ignition delay and specific fuel consumption, and CO, HC, NOx concentration and smoke density. When using emulsified fuel, as a water addition rate was increased, combustion pressure, pressure rise rate and heat generating rate was increased, the period of ignition delay was lengthening, the specific fuel consumption was some what increased in contrast to diesel fuel in low load, but deceased in high load region. And NOx concentration was decreased, CO concentration was increased in low load, but decreased in high load region, HC concentration was increased in contrast to diesel fuel in all region.

Analysis of Performance and Emissions Characteristics on Gasoline Engine for Hybrid Vehicles with Optimum EGR Rate and the Cylinder Variation of EGR Rate (하이브리드용 가솔린 엔진에서 최적 EGR적용 및 실린더간 편차에 따른 성능 및 배출가스 특성 분석)

  • Park, Cheol-Woong;Choi, Young;Kim, Chang-Gi
    • Transactions of the Korean Society of Automotive Engineers
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    • v.17 no.1
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    • pp.87-95
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    • 2009
  • EGR(Exhaust gas recirculation) provides an important contribution in achieving the development targets of low fuel consumption and low exhaust emission levels on gasoline engine for hybrid vehicles while allowing stoichiometric fuelling to be retained for applications using the three-way catalysts. However, the occurrence of excessive cyclic variation with high EGR normally prevents substantial fuel economy improvements from being achieved in practice. Therefore, the optimum EGR rate in gasoline engine for hybrid vehicles should be carefully determined in order to achieve low fuel consumption and low exhaust emission. In this study, 2 liters gasoline engine with E-EGR system was used to investigate the effects of EGR with optimum EGR rate on fuel economy, combustion stability, engine performance and exhaust emissions. As the engine load becomes higher, the optimum EGR rate tends to increase. The increase in engine load and reduction in engine speed make the fuel consumption better. The fuel consumption was improved by maximum 5.5% at low speed, high load operating condition. As the simulated EGR variation on a cylinder is increased, due to the increase in cyclic variation, the fuel consumption and emissions characteristics were deteriorated simultaneously. To achieve combustion stability without a penalty in fuel consumption and emissions, the cylinder-to-cylinder variations must be maintained under 10%.