• Title/Summary/Keyword: Specific Fuel Consumption(SFC)

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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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    • 2005.11a
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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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Effects of Emulsified Fuel on Combustion Characteristics in a Diesel Engine (디젤기관에 있어서 에멀젼연료 연소특성에 미치는 영향)

  • Lim, J.K.;Cho, S.G.;Hwang, S.J.;Yoo, D.H.
    • Journal of Power System Engineering
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    • v.11 no.1
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    • pp.51-55
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    • 2007
  • A study on combustion characteristics using emulsified fuel in a diesel engine were performed experimentally. In this paper, the experiments were performed at engine speed 1800rpm, emulsion ratios were 0%, 10%, 20%, and main measured items were specific fuel consumption, cylinder pressure, rate of pressure rise, rate of heat release etc. The obtained conclusions were as follows. 1) Specific fuel consumption increased maximum by 19.8% at low load, but was not affected at full load. 2) Rate of pressure rise and rate of heat release were about the same in the case of 10% and 20% of emulsion ratio. 3) Cylinder Pressure increased 9.6%, rate of pressure rise increased 53.4% in case of emulsion ratio 20% at full load. 4) Rate of heat release increased 72.4% in case of emulsion ratio 20% at full load.

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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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Study on the effect of Jet Fuel alteration on Turbine Engine Performances through Turbine Engine Test (터빈엔진시험을 통한 제트연료 변경에 따른 엔진성능 변화 연구)

  • Kim, You-Il;Min, Seong-Ki
    • Journal of the Korean Society of Propulsion Engineers
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    • v.15 no.2
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    • pp.23-28
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    • 2011
  • The engine ground and altitude tests were carried out to investigate the effect of jet fuel alteration on the performance of a small turbojet engine. JP-S was supplied 8% higher than JP-8 by fuel metering system at the same command. The employment of JP-S showed the similar starting characteristic to that of JP-8, however, difference in the ignition time and acceleration rate of engine speed due to the difference of fuel flow rate by fuel metering system was observed. In spite of jet fuel alteration, the test results yield the similar steady-state engine performance in net thrust, air flow, exhaust gas temperature, etc. On the other hand, the fuel consumption of JP-S increased by 5 % compared with that of JP-8. In point of specific fuel consumption (SFC), SFC of JP-S was approximately 1.1~2.6 %, 5 % higher than that of JP-8 in ground and altitude tests respectively at the same thrust.

Study on the effect of Jet Fuel alteration on Turbine Engine Performances through Turbine Engine Test (터빈엔진시험을 통한 제트연료 변경에 따른 엔진성능 변화 연구)

  • Kim, You-Il;Min, Seong-Ki
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2010.11a
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    • pp.410-415
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    • 2010
  • The engine ground and altitude tests were carried out to investigate the effect of jet fuel alteration on the performance of a small turbojet engine. JP-S was supplied 8% higher than JP-8 by fuel metering system at the same command. The employment of JP-S showed the similar starting characteristic to that of JP-8, however, difference in the ignition time and acceleration rate of engine speed due to the difference of fuel flow rate by fuel metering system was observed. In spite of jet fuel alteration, the test results yield the similar Steady-State engine performance in Net thrust, Air flow, Exhaust Gas Temperature, etc. On the other hand, the Fuel consumption of JP-S increased by 5 % compared with that of JP-8. In point of Specific Fuel Consumption (SFC), SFC of JP-S was approximately 1.1~2.6 %, 5 % higher than that of JP-8 in ground and altitude tests respectively at the same thrust.

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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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    • 2006.06a
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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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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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Effects of Fuel Injection Timing on Exhaust Emissions Characteristics in Marine Diesel Engine (선박용 디젤기관의 연료분사 시기가 배기배출물 특성에 미치는 영향)

  • 임재근;최순열
    • Journal of Advanced Marine Engineering and Technology
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    • v.26 no.3
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    • pp.307-312
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    • 2002
  • A study on the exhaust emissions of marine diesel engine with various fuel injection timing is performed experimentally .In this paper, fuel injection timing is changed from BTDC $14^{\circ}$ to $20^{\circ}$ by $2^{\circ}$ intervals, the experiments are performed at engine speed 1800rpm and from load 0% to 100% by 25% intervals, and main measured parameters are fuel consumption rate, Soot, NOx, HC and CO emissions etc. The obtained conclusions are as follows (1) Specific fuel consumption is indicated the least value at BTDC $18^{\circ}$ of fuel injection timing and it is increased in case of leading the injection timing. (2) Soot emission is decreased in case of leading fuel injection timing and it is increased in the form of convex downwards with increasing the load. (3) NOx emission is increased in case of leading fuel injection timing and it is increased in the form of straight line nearly with increasing the load. (4) HC and CO emissions are decreased in case of leading fuel injection timing and they are changed in the form of convex downwards with increasing the load.

Effects of Fuel Injection Timing on Exhaust Emissions Characteristics in Diesel Engine (디젤기관의 연료분사시기가 배기배출물 특성에 미치는 영향)

  • 임재근;최순열
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2001.11a
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    • pp.50-56
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    • 2001
  • A study on the exhaust emissions of diesel engine with various fuel injection timing is peformed experimentally. In this paper, fuel injection timing is changed from BTDC $14^{\circ}$ to $20^{\circ}$ by $2^{\circ}$ intervals, the experiments are performed at engine speed 1800rpm and from load 25% to 100% by 25% intervals, and main measured parameters are fuel consumption rate, Soot, NOx. HC and CO emissions etc. The obtained conclusions are as follows (1) Specific fuel consumption is indicated the least value at BTDC $18^{\circ}$ of fuel injection timing and it is increased in case of leading the injection timing. (2) Soot emission is decreased in case of leading fuel injection timing and it is increased in the form of convex downwards with increasing the load. (3) $NO_x$ emission is increased in case of leading fuel injection timing and it is increased in the form of straight line nearly with increasing the load. (4) HC and CO emissions are decreased in case of leading fuel injection timing and they are changed in the form of convex downwards with increasing the load.

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Effects of Biodiesel Fuel on Exhaust Emission Characteristics in Diesel Engine(Using Soybean Oil) (디젤기관에서 바이오디젤 연료가 배기배출물 특성에 미치는 영향(대두유를 중심으로))

  • Lim, Jae-Keun;Choi, Soon-Youl;Cho, Sang-Gon
    • Journal of Advanced Marine Engineering and Technology
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    • v.32 no.1
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    • pp.27-32
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    • 2008
  • Recently, we have a lot of interest in alternative fuels to provide energy independence from oil producing country and to reduce exhaust emissions for air pollution prevention. Biodiesel, which can be generated from natural renewable sources such as new or used vegetable oils or animal fats, may be used as fuel in diesel engine of compression ignition engine. In this paper, the test results on specific fuel consumption and exhaust emissions 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 biodisel was produced from soybean oil at our laboratory. This study showed that Soot and CO emission were decreased as the blending ratios of biodiesel to diesel oil increased, on the other hand NOx emission was slightly increased because of the oxygen content in biodiesel. Also, the biodiesel blends yielded slightly higher specific fuel consumption than that of diesel oil because of lower heating value of biodiesel.