• Title, Summary, Keyword: Specific fuel consumption

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A Study on the Specific Fuel Consumption of the Farm Kerosene Engines (농업용 석유기관의 연료소비율에 관한 연구)

  • 신건성
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.17 no.2
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    • pp.3763-3771
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    • 1975
  • This study was attempted to investigate the changes of specific fuel consumption, compression pressure and power output, consequently to obtain basic data on farm kerosene engine. The samples which are used in this study are a 4 cycle water cooled korosene engine for the use of K6-CT83 power tiller and a 4 cycle air-cooled kerosene engine for the use of G5L-3A water pump. The Korean Industrial Standards (K.S)KS-B 6002 "Test code of small internal combustion engine" was referred in carrying out this study, and its results are as follows. 1. According to load increasing, the speific fuel consumption of the engines generally decreases, however, in case of 10% over-loading it increases. 2. As a result of full load consecutive operation, according to passing of operating time, the amount of wear generally increases, consequently the speific fuel consumption also increases, and inversly the compression pressure decreases. 3. The changes of specific fuel consumption and compression pressure were closely related with time of piston ring exchange, and periodically about 100 hours the engines show the increase of specific fuel consumption and the decrease of compression pressure. 4. After about 300 hours, although the engine had new piston rings, the specific fuel consumption increase, consequently the engine needs boring. In actual use, it is impossible to operate consecutively on full load, therefore the boring time of engine is expected to come later.

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An Experimental Study on Combustion Characteristics of Biodiesel Fuel in Marine Diesel Engine (선박디젤기관에서 바이오디젤연료의 연소특성에 대한 실험적 연구)

  • Cho, Sang-Gon
    • Journal of Power System Engineering
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    • v.19 no.3
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    • pp.29-35
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    • 2015
  • Environmental pollution is produced by consumption of fossil fuel, therefore alternative fuels is interested for development of new energy resources and reduction of exhaust emissions for air pollution prevention. Biofuels are produced from new vegetable oil and animal fat, may be used as fuel without change of engine structure in diesel engine. In this paper, the test results on specific fuel consumption, combustion characteristics of neat diesel oil and biodiesel blends(10 vol.% biodiesel and 20 vol.% biodiesel) were presented using four stroke, direct injection diesel engine, especially this biodiesel was produced from biodiesel fuel at our laboratory by ourselves. This study showed that specific fuel consumption is increased slightly, on the other hand cylinder pressure, rate of pressure rise, rate of heat release and soot were decreased slightly in the case of biodiesel blends than neat diesel oil.

A Study on the Combustion Characteristics of Ultra High Pressure Fuel Injection System in a Diesel Engine(I) (초고압 연료분사장치 디젤기관의 연소특성에 관한 연구(I))

  • Choi, D.S.;Rhee, Kyung-Tai
    • Journal of ILASS-Korea
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    • v.4 no.1
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    • pp.34-44
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    • 1999
  • The purposes of this study were to evaluate engine performance and to analyze smoke emission characteristics for varied injection pressures and engine operating conditions of an electronically-controlled ultra high pressure fuel injection system(UHPFIS). It was discovered that the engine performance with the present UHPFIS was far better than what was initially expected. And the UHPFIS permitted engine operation at air/fuel ratios richer than 20 : 1 without increasing smoke emissions. It was discovered that the indicated mean effective pressure was increased, while the specific fuel consumption and the amount of soot were decreased, as the fuel rail pressures were improved atomization of the fuel spray. As the intake air temperature was increased from $38\sim205^{\circ}C$ in 38 degree increments, the indicated mean effective pressure was dropped while the specific fuel consumption was increased.

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Effects on the Characteristics of Exhaust Emissions by using Emulsion Fuel in Diesel Engine (디젤기관에 있어서 에멀젼 연료가 배기배출물 특성에 미치는 영향)

  • Lim, J.K.;Cho, S.G.;Hwang, S.J.;Yoo, D.H.
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • pp.9-10
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    • 2005
  • A study on the combustion and exhaust emissions characteristics by using Emulsion Fuel in Diesel Engine is performed experimentally. In this paper, the experiments are performed at engine speed 1800rpm, emulsion fuel ratio is 0%, 5%, 10%, 15%, 20%, 25%, and main measured items are specific fuel consumption, NOx and Soot emissions etc. The obtained conclusions are as follows. 1) Specific fuel consumption increase maximum 19.8% at low load, but is not effected at full load. 2) NOx emissions decrease 30% in case of emulsion fuel ratio 25% at full load. 3) Soot emission decrease 58.9% in case of emulsion fuel ratio 25% at full load.

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Analysis of Factors Affecting Fuel Consumption of Agricultural Tractor (농용 트랙터 연료소모량에 미치는 요인분석)

  • Park, Seok-Ho;Kim, Young-Jung;Im, Dong-Hyeok;Kim, Chung-Kill;Jang, Yang;Kim, Sung-Su
    • Journal of Biosystems Engineering
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    • v.35 no.3
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    • pp.151-157
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    • 2010
  • The objective of this study was to analyze the factors affecting on fuel consumption of agricultural tractor. According to the statistical analysis, fuel consumption of agricultural tractor was considerably influenced by kind of operation, throttle engine speed and gear steps of tractor but much less by kind of soil. Specific fuel consumption of the tractor in plowing, dry paddy tilling, wet paddy tilling and wet paddy levelling was 0.33~0.36, 0.30~0.45, 0.19~0.34, 0.28~0.39 L/$kW{\cdot}h$, respectively, and $CO_2$ emission was 0.36~0.45, 0.35~0.58, 0.22~0.42, 0.24~0.37 kg/$kW{\cdot}h$, respectively. Specific fuel consumption and $CO_2$ emission increased as throttle engine speed increased but reversely proportional with gear step of tractor, by which one can reduce fuel consumption and $CO_2$ emission with practicing of "Gear up & Throttle Down" technique in paddy operations.

Auxiliary Power Unit Emergency Fuel Test (보조동력장치 비상연료 시험)

  • Lim, Byeung-Jun;Lee, Dong-Ho;Koo, Hyun-Cheol;Ryu, Se-Hyun
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.908-911
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    • 2011
  • Aircraft Auxiliary Power Unit can start and operate using not only main fuel(JP-8) but also specified emergency fuels for emergency operation. In oder to verify emergency fuel requirement, emergency fuel test using commercial diesel fuel was performed. Changes in specific fuel consumption due to use of diesel fuel are 3.5%~7.8%, which satisfied requirement. Diesel fuel showed similar starting characteristic to the JP-8. The specific fuel consumption of diesel increased by 2.0%~3.4% compared with that of JP-8.

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The Optimum Operating Condition for Reduction of Fuel Consumption -In the Case of Training Ship Pusan 402- (연료 절감을 위한 최적운전 조건 -신습선 부산 402호의경우-)

  • Kim, Yeong-Sik;Kim, Sam-Kon;Yoon, Suck-Hun
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.22 no.1
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    • pp.29-33
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    • 1986
  • This paper aims at finding out the optimum operating condition to reduce fuel consumption for the training ship Pusan 402 with controllable pitch propeller. For this purpose, this paper examints the variation of ship speed and fuel consumption in accordance with the change of engine revolution and propeller pitch. The results obtained are as follows: 1. When engine revolution is constant, the ship speed sluggishly increases according to the increase of propeller pitch but fuel consumption extremely increases. The higher revolution the engine is, the more remarkable this tendency is. 2. As the engine revolution becomes lower, the fuel consumption per mile decreases. Howt.er = the fuel consumption under the same engine revolution differs according to the propeller pitch. 3. Specific fuel consumption is uniformed about 180g/ps.h at any case of load. 4. Among the various operating conditions which yield the same ship speed, fuel consumption lowers in the case of lower engine revolution and larger propeller pitch.

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Analysis on Application Plan of Factorial Design in Relation to Responses for Electronically-controlled Diesel Engine (전자제어식 디젤엔진에 있어서 반응치에 따른 요인배치법의 활용 방안에 대한 분석)

  • Lee, Jung-Gyu;Kim, Min-Jong;Koh, Sung-Wi;Yang, Ju-Ho;Han, Kyu-Il;Koh, Dae-Kwon;Jung, Suk-Ho
    • Journal of Power System Engineering
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    • v.22 no.1
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    • pp.5-10
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    • 2018
  • In order to employ factorial design on electronically-controlled diesel engine, effects of 5 factors on specific fuel consumption, nitrogen oxides and carbon monoxide were examined by fractional and full factorial design in this research. There were different results between fractional and full factorial design, then effect of variables as ambient condition and measurement of fuel consumption were confirmed. It was shown that ambient condition affected uniformly trend of nitrogen oxides and carbon monoxide. However, both ambient condition and measurement of fuel consumption had nothing to do with trend of specific fuel consumption and therefore it must be careful to employ factorial design on specific fuel consumption as response.

Effects on the Characteristics of Combustion by using Emulsion Fuel in Diesel Engine (디젤기관에 있어서 에멀젼 연료가 연소특성에 미치는 영향)

  • Lim, J.K.;Cho, S.G.;Hwang, S.J.;Yoo, D.H.;Seo, J.W.
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • pp.41-42
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    • 2006
  • A study on the combustion characteristics by using Emulsion Fuel in Diesel Engine is performed experimentally. In this paper, the experiments are performed at engine speed 1800rpm, emulsion fuel ratio is 0%, 10%, 20%, and main measured items are specific fuel consumption, pressure, ratio of pressure rise, rate of heat release etc. The obtained conclusions are as follows. 1) Specific fuel consumption increase maximum 19.8% at low load, but is not effected at full load. 2) Ratio of pressure rise and rate of heat release are about the same in the case of 10% and 20% of emulsion fuel ratio. 3) Cylinder Pressure increase 11.7%, ratio of pressure rise increase 60.4% in case of emulsion fuel ratio 20% at full load. 4) Rate of heat release increase 76.9% in case of emulsion fuel ratio 20% at full load.

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Study on engine performance and emissions using alcohol-gasoline blend as a fuel (Alcohol-gasoline 기관의 성능과 배출물에 관한 연구)

  • 김응서;김효경;유재석
    • Journal of the korean Society of Automotive Engineers
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    • v.2 no.1
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    • pp.51-60
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    • 1980
  • Experiments about engine performance using alcohol-gasoline blend as a fuel are studied. A conventional 4cycle 4cylinder gasoline engine is used. Measurements on torque, output, specific fuel consumption, and emissions are made over ignition timing and mixing ratio. Up to vol. 15% of alcohol, torque and output using alcohol-gasoline blend are almost same with using only gasoline, and specific fuel consumption is improved about 7%. In emissions alcohol-gasoline blend is more effective than gasoline.

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