• Title/Summary/Keyword: Combustion characteristics

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A Study on the Combustion Characteristics according to Evaporation rate of Methanol - Blended Fuel (메탄올 혼합 연료의 기화율 변화에 따른 연소특성에 관한 실험적 연구)

  • Cho, H.M.
    • Journal of ILASS-Korea
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    • v.2 no.2
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    • pp.24-34
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    • 1997
  • This paper describes the investigation of combustion characteristics of gasoline-methanol blend in constant volume combustion chamber. A constant volume combustion chamber was used to elucidate a basic combustion characteristics and the premixer was installed to control temperature and equivalence ratio. And the maximum pressure, combustion duration and flame propagation according to the evaporation rate were measured to determine the optimal temperature range for evaporating a blend fuel. These experimental results indicate that the combustion characteristics such as combustion chamber pressure and combustion were deteriorated by decreasing surrounding temperature of fuel. These experimental results indicate that the combustion characteristics such as combustion chamber pressure and combustion were deter orated by decreasing surrounding temperature of fuel injected. It was also found that the overall gasification process for methanol blend fuel was influenced by a combustion chamber temperature rather than a premixer temperature.

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Influence of Combustor Pressure on Combustion Characteristics and Local Flame Reaction in the Partially Premixed Flames with $CH_4$, $C_2H_4$ and $C_3H_8$ (부분 예혼합 화염의 연소실 압력이 연료별(메탄, 에틸렌, 프로판) 연소특성과 국소 화염 반응에 미치는 영향)

  • Kim, Jong-Ryul;Son, Je-Ha;Noh, Young-Gu;Kim, Yun-Dong;Choi, Gyung-Min;Kim, Duck-Jool
    • Journal of the Korean Society of Combustion
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    • v.15 no.4
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    • pp.29-36
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    • 2010
  • An experimental study was conducted for three different fuels($CH_4$, $C_2H_4$ and $C_3H_8$) to investigate the combustion characteristics and the local reaction intensity with combustor pressure(-30kpa~30kpa). Regardless of fuel composition, EINOx decreased with reducing pressure decreased. Structure and combustion characteristics were also largely affected by the combustor pressure. In addition, reaction intensity in terms of the changing combustor pressure and equivalence ratio was investigated. Combustion reaction in higher than atmospheric pressure was very active than the lower combustor pressure. When the combustor pressure is lower than the atmospheric pressure, the overall reactivity is noticeably enhanced due to the elevated diffusion process of unburned mixture. It was found that the combustion characteristics of the methane and propane flames are considerably influenced by the pressure while those of ethylene flame are less sensitive to the combustor pressure.

Comparison of the Combustion Characteristics of Methane-Air and Gasoline-Air Mixtures (가솔린.메탄의 연소특성 비교)

  • Park, M.H.
    • Journal of ILASS-Korea
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    • v.7 no.3
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    • pp.7-11
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    • 2002
  • Comparison of the combustion characteristics of methane-air and gasoline-air mixtures has been conducted experimentally by a spherical bomb technique. The results indicate 1) the burning velocity of gasoline is slightly higher than that of methane, but their basic behavior of combustion characteristics, positive dependence on temperature and negative one on pressure, are the same, and 2) 20 vol.% addition of hydrogen to methane enhances the burning velocity by about 30%, but does not come to reverse the tendency of pressure dependence to that of pure hydrogen.

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Effects of Pressure on Combustion Characteristics of Conical Flameholder

  • Yamamoto, Takeshi;Shimodaira, Kazuo;Kurosawa, Yoji
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2004.03a
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    • pp.99-105
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    • 2004
  • The effects of pressure on combustion characteristics of the conical flameholder were investigated experimentally in the pressure range from 0.11 ㎫ to 0.40 ㎫. The result shows that the total equivalence ratio of lean limit becomes lower as the combustor inlet pressure rises and NOx emission is proportional to the pressure to the 0.5th power.

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압축 착화 기관의 연소 변동 특성에 관한 연구

  • 이창식
    • Journal of the korean Society of Automotive Engineers
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    • v.9 no.1
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    • pp.69-76
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    • 1987
  • This paper deals with the theoretical prediction and cyclic variation of combustion characteristics in a four stroke, single0cylinder, diesel engine. Theoretical calculations employed a simple empirical model of analysis of energy equation for the thermodynamic system of engine cylinder. The cyclic variation of combustion characteristics is investigated, in term of frequency distribution and standard deviation of peak characteristics, as obtained by combustion analyzer system. The results of theoretical prediction are shown to be in close agreement with the experimental data. The effect of fuel injection timing, engine speed, cooling water temperature, and the compression ratio on the cyclic variations of combustion characteristics were discussed.

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A study on the combustion characteristics of compression ignition engine (압축착화기관의 연소특성에 관한 연구)

  • 이창식
    • Journal of the korean Society of Automotive Engineers
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    • v.7 no.1
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    • pp.35-42
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    • 1985
  • This paper describes an experimental study of the effect of injection timing on the combustion characteristics in four stroke cycle diesel engine with direct injection type combustion chamber. The effect of injection timing and compression ratio of engine on the combustion characteristics are investigated. Experimental results of combustion characteristics in cylinder show that the combustion pressure and the rate of pressure rise decrease in accordance with the retard of fuel injection timing. It is observed that the rate of pressure rise in cylinder is increased an increase in the compression ratio of engine. The effect of the fuel injection timing on the frequency of cylinder pressure brings about the same trend of the maximum rate of pressure rise in cylinder.

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A study on the combustion characteristics according to evaporation rate of gasoline (가솔린 연료의 기화율 변화에 따른 연소 특성에 관한 기초 연구)

  • Lee, K.H.;Lee, C.S.;Shin, K.S.;Cho, H.M.
    • Journal of ILASS-Korea
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    • v.1 no.3
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    • pp.29-36
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    • 1996
  • The present study systematically investigates the effect of evaporation rate on the combustion characteristics and the flame stabilization in a gasoline engine. A constant volume combustion chamber was used to elucidate a basic combustion characteristics and the premixer was installed to control temperature and equivalence ratio. And the maximum pressure, combustion duration and flame propagation according to the evaporation rate were measured to determine the optimal temperature range for evaparating a gasoline fuel. These experimental results indicate that the combustion characteristics such as combustion chamber pressure and combustion duration were deteriorated by decreasing surrounding temperature of fuel injected. It was also found that the overall gasification process for gasoline fuel was strongly influenced by a combustion chamber temperature rather than a premixer temperature.

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A study on the thermodynamic analysis of combustion characteristics of diesel engine (디이젤機關 燃燒特性의 熱力學的 解析에 관한 硏究)

  • 이창식
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.10 no.2
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    • pp.215-222
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    • 1986
  • This paper presents the results of investigation, the aim of which was to predict theoretically the processes of thermodynamic cycle of M-combustion chamber type diesel engine. The combustion characteristics in cylinder are evaluated from the energy equation for an thermodynamic system in engine cylinder. In order to predict the combustion pressure in cylinder, the engine is divided in various control volumes. The simulation results of combustion characteristics show that the comparison of computed and measured values brings about the good coincidence.

The combustion characteristics of vehicle upholsteries

  • Park, Hyung-Ju;Kang, Young-Goo;Kim, Hong
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • 1997.11a
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    • pp.211-218
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    • 1997
  • Five parts of vehicle upholsteries were sampled to determine its combustion characteristics. Oxygen Indexer, Smoke chamber, Differential Scanning Calorimetry(DSC) are applied as the analysis apparatus. All LOI values of samples appear less than 21. The combustion phenomena of vehicle upholster primarily depends on properties of each layer material. The amount of smoke generated is the experiment reached the maximum value within 30-90sec after ignition. The experimental results of combustion characteristics and DSC of H/Line also indicated that the layer of foam was melt first and it caused the propagation of flame through the sample. The combustion characteristics of multi layer materials primarily depend on thermal characteristic of single layer material.

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Effect of methanol-blended fuel properties on the combustion characteristics of a gasoline engine (메탄올 혼합연료가 기관 연소 특성에 미치는 영향)

  • Jo, Haeng-Muk;Lee, Chang-Sik
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.20 no.10
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    • pp.3381-3386
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    • 1996
  • The engine performance and combustion characteristics of methanol blended fuel in spark ignition engine were discussed on the basis of experimental investigation. The effects of methanol blending fuel on combustion in cylinder were investigated under various conditions of engine cycle and blending ratio. The results showed that the engine performance was influenced by the methanol blending ratio and the variations of operating conditions of test engine. The increase of fuel temperature brought on the improvement of combustion characteristics such as cylinder pressure, the rate of pressure rise and heat release in an engine. The burning rate of fuel-air mixture, the exhaust emissions and the other characteristics of performance were discussed also.