• Title, Summary, Keyword: Specific fuel consumption

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A STUDY ON THE PERFORMANCE AND EMISSIONS CHARACTERISTICS OF SPARK IGNITION ENGINE FUELLED WITH ETHANOL GASOLINE BLENDED FUEL

  • Han, Sung Bin
    • Journal of Energy Engineering
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    • v.23 no.2
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    • pp.170-174
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    • 2014
  • This paper presents the influences of ethanol addition to gasoline on bench test a spark ignition engine performances and emissions characteristics. The use of ethanol gasoline blended fuels decrease the brake power and brake torque, and increases the brake specific fuel consumption (BSFC). Ethanol gasoline blended fuels show lower brake torque and brake power and higher BSFC than gasoline. When ethanol containing oxygen is blended with gasoline, the combustion of the engine becomes better and therefore CO emission is reduced. HC emissions decrease to some extent as ethanol added to gasoline increase, as the percentage of ethanol in the blends increased, NOx emission was decreased under various engine speeds.

A Commercial Development of Ultrasonic Fuel Feeding System for Low Pollution and High Performance in Diesel Automobile (디젤자동차의 저공해(低公害), 고출력용(高出力用) 초음파(超音波) 연료공급장치(燃料供給裝置)의 상용화(商用化) 개발(開發))

  • Jung, M.J.;Cho, K.S.;Lee, G.Y.;Ryu, J.I.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.3 no.2
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    • pp.122-129
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    • 1995
  • This is an experimental study on the chassis dynamometer and high way road testing during a severe winter and summer season. Results obtained to compare with the ultrasonic fuel feeding system and conventional fuel system in diesel automobile engine. The results were as followers in case of the ultrasonic fuel feeding system. 1. In chassis dynamometer testing during given vehicle speeds, output were increased from 4.6 to 11.43%, brake specific fuel consumption were increased from 6 to 19%, smoke were decreased from 16.7 to 50%. 2. The running fuel consumption ratio in high way road test were decreased by 15.3% at a severe summer and 20.2% at a severe winter.

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Combustion Characteristics of a Direct Injection Agricultural Diesel Engine with Rapeseed Oil (유채유를 연료로 한 직접분사식 농용 디젤기관의 연소특성)

  • Choi, S.H.;Byeon, J.W.
    • Journal of Biosystems Engineering
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    • v.34 no.3
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    • pp.135-139
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    • 2009
  • Harmful exhaust emissions of diesel engines are recognized as main causes of air pollution in these days. But, the direct injection diesel engine is widely used for sake of minimization on energy consumption. Because biodiesel fuel is a renewable and alternative fuel for a diesel engine, its usability is expanded. To investigate the effect of biodiesel fuel(extracted from rapeseed oil) on the characteristics of performance and exhaust emissions in an agricultural diesel engine, the biodiesel fuel derived from rapeseed oil was applied in this study. Smoke emission of esterified rapeseed oil was reduced remarkably by approximately 44.5% at 1500 rpm, full load in comparison with the commercial diesel fuel. The power, torque and brake specific energy consumption of the diesel engine showed very slight differences. It was concluded that esterified rapeseed oil could be utilized effectively as an alternative and renewable fuel for agricultural direct injection diesel engines.

Effects of Distribution of Axle Load and Inflation Pressure of Tires on Fuel Efficiency of Tractor Operations (차축의 중량 분포와 타이어의 공기압이 트랙터 작업의 연료 효율에 미치는 영향)

  • Lee, Jin-Woong;Kim, Kyeong-Uk;Gim, Dong-Hyeon;Choi, Kyu-Jeong
    • Journal of Biosystems Engineering
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    • v.36 no.5
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    • pp.303-313
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    • 2011
  • This study was conducted to investigate the effects of axle weight distribution and inflation pressure of tire on the fuel economy of tractors as well as operational range of tractor engine in terms of engine speed and power when a 4WD tractor of 38.2 kW rated power at 2500 rpm is used for plowing and flooded-field rotavating in paddy fields. (1) Plowing operation required an average engine power of 9.6~13.5 kW which equals 25~35% of rated PTO power. Engine speed ranged from 1,320.4 to 1,737.4 rpm, work velocity from 3.4 to 4.8 km/h, and fuel consumption from 3.2 to 4.2 L/h, respectively. (2) Flooded-field rotavating required an average engine power of 11.5~18.5 kW which equals 30~48.4% of rated PTO power. Out of this 6.2~12.2 kW was used for PTO power. Engine speed ranged from 1,557 to 2,067 rpm, work velocity from 2.5~5.4 km/h and fuel consumption from 3.2~5.5 L/h, respectively. (3) Axle weight distribution, inflation pressure of tire and moisture content of soil did not affect significantly the specific volumetric fuel consumption but affected significantly the fuel consumption per unit area of operation. Fuel savings amounted to 65% in plowing operation and 20% in flooded-field rotavating when the axle weight distribution and inflation pressure of tire were optimally adjusted. (4) Optimal adjustment of axle weight distribution and inflation pressure of tire are expected to save fuel consumption by 10~65% per unit area of operation in plowing and 10~20% in flooded-field rotavating.

A Study on Idle Performance Improvements for a Gasoline Engine with the Syngas Assist (합성가스를 이용한 가솔린엔진 아이들 성능 개선에 관한 연구)

  • Song, Chun-Sub;Kim, Chang-Gi;Kang, Kern-Young;Cho, Young-Seok
    • 한국연소학회:학술대회논문집
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    • pp.245-251
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    • 2005
  • Recently, fuel reforming technology for the fuel cell vehicle has been applied to internal combustion engines, with various purpose. Syngas which is reformed from fossil fuel has hydrogen as a major component. It has better effort in combustion characteristics such as wide flammability and hig speed flame propagation. In this study, syngas was added to a gasoline engine for the improvement of combustion stability and exhaust emission in idle state. Combustion stability, exhaust emissions, fuel consumption and exhaust gas temperature were measured to investigate the effects of syngas addition on idle performance. Results showed that syngas has ability to extend lean operation limit and ignition retard range. with dramatical reduction of engine out emissions.

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A Study on the Ship's Speed for Reducing the Fuel Oil Consumption in Actual Ships (선박의 연료소모량 절감을 위한 항해 속력에 관한 연구)

  • Kim, Soon-Kap;Lee, Yun-Sok;Kong, Gil-Young;Kim, Jong-Pil;Jung, Chang-Hyun
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.18 no.1
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    • pp.41-47
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    • 2012
  • Recently, due to the rapid rise of the international oil price, the burden of fuel oil expense is relatively increasing in a ship. And the international restriction of the greenhouse gas which was generated from the burning of fuel oil is also rapidly strengthened. Therefore, to reduce the greenhouse gas and fuel oil consumption, many shipping company adopted the low speed navigation and it was focused on the improvement of fuel consumption efficiency and the usage of alternative energy in the marine engine development field. In this paper, the fuel oil consumption according to the ship's speed was measured in the actual seas and analyzed the shop test results in the shipyard and the ship navigation data from the abstract log. And then it was proposed that the ship's economic speed was 14~15kts and the optimum rpm was 140~150 in specific sea conditions.

The Performance and Emission Characteristics on Operating Condition for the SI Engine Fuel with Gasoline-Ethanol and Hydrogen Enriched Gas (에탄올 및 수소농후가스 혼합연료 기관의 운전영역에 따른 성능 및 배기 특성)

  • Park, Cheol-Woong;Kim, Chang-Gi;Choi, Young;Oh, Seung-Mook;Lim, Gi-Hun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.18 no.1
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    • pp.23-30
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    • 2010
  • Trends of the automotive market require the application of new engine technologies, which allows for the use of different types of fuel. Since ethanol is a renewable source of energy and it contributes to lower $CO_2$ emissions, ethanol produced from biomass is expected to increase in use as an alternative fuel. It is recognized that for spark ignition (SI) engines ethanol has advantages of high octane number and high combustion speed. In spite of the advantages of ethanol, fuel supply system might be affected by fuel blends with ethanol like a wear and corrosion of electric fuel pumps. So the on-board hydrogen production out of ethanol reforming can be considered as an alternative plan. This paper investigates the influence of ethanol fuel on SI engine performance, thermal efficiency and emissions. The results obtained from experiments have shown that specific fuel consumption has increased by increasing ethanol amount in the blend whereas decreased by the use of hydrogen-enriched gas. The combustion characteristics with hydrogen-enriched gaseous fuel from ethanol reforming are also examined.

Economical Evaluation of a LNG Dual Fuel Vehicle Converted from 12L Class Diesel Engine (12리터급 경유엔진을 개조한 LNG혼소 화물자동차의 경제성 분석)

  • Han, Jeong-Ok;Chae, Jung-Min;Lee, Jung-Sung;Hong, Sung-Ho
    • Journal of Energy Engineering
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    • v.19 no.4
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    • pp.246-250
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    • 2010
  • It was measured engine power, specific fuel consumption and exhaust emissions to analyze fuel economy between LNG dual fuel vehicle and base diesel one. The tested LNG dual fuel engine is converted from diesel engine having 12 liter heavy duty class. The power of LNG dual fuel engine is 5% lower than diesel one and the engine efficiency is also lower than diesel case. However the exhaust emission of diesel engine such as PM, NOx, CO and $CO_2$ showed higher than that of LNG duel fuel case except NMHC component. And economical analysis were carried out two cases for an aspect of fuel economy and environmental benefit. As a result, LNG dual fuel vehicle gives some economic benefit to whom both business party and public side respectively though considering the subsidy and price discount for diesel.

A Study on Application of On/Off Type EGR and Optimal EGR Rate for Gasoline-Hybrid Engine (하이브리드용 가솔린 엔진에서 On/Off 방식 EGR적용 및 최적 EGR 율에 관한 연구)

  • Park, Cheol-Woong;Choi, Young;Kim, Chang-Gi
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.4
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    • pp.143-150
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    • 2008
  • EGR(exhaust gas recirculation) is an attractive means of improving the fuel economy of spark ignition engines, as it offers the benefits of charge dilution (lower pumping and cooling losses) 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-Hybrid engine 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 on fuel economy, combustion stability, engine performance and exhaust emissions. EGR tolerance with load variation was found to be more sensitive than with rpm variation. With optimal EGR rates, the fuel consumption was improved by 5.5% while a combustion stability was guaranteed.

A Study on the Heat Rejection to Coolant in a Gasoline Engine (가솔린 엔진에서의 냉각수로의 전열량에 대한 연구)

  • 류택용;신승용;이은현;최재권
    • Transactions of the Korean Society of Automotive Engineers
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    • v.5 no.6
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    • pp.77-88
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    • 1997
  • The heat rejection to coolant is a dominant factor for building vehicle cooling system such as radiator and cooling fan. Since the vehicle cooling system also has effects on fuel consumption and noise, the study of heat rejection to coolant has been emphasized. However, the study on heat rejection to coolant has been mainly focused on the field that related to the characteristics of combustion and localized heat loss. It is no much of use in design for the entire cooling system because it is focused on such a specific point. In this work, the heat rejection rate to coolant for four different engines are obtained to derive a simple heat transfer empirical formula that can be applied to the engine cooling system design, and it is compared with the other studies. Also, to observe effects of engine operation factors and heat transfer factors on coolant, we measured the metal temperature and the heat rejection rate. The heat rejection to coolant does not depend significantly upon the coolant flowrate, but mainly upon the amount of air fuel mixture and the air fuel ratio as long as the composition of coolant does not change. The reduction of heat rejection to coolant did not effectively improve the fuel consumption, but was mostly converted to raise the exhaust gas temperature and the oil temperature.

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