• 제목/요약/키워드: Combustion Conditions

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연소상태 감시용 화염 영상분석 시스템 (Flame Image Analysis Systems for Combustion Conditions Monitoring)

  • 백운보;한성현
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2003년도 춘계학술대회 논문집
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    • pp.499-502
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    • 2003
  • Increase energy costs have placed demands for improved combustion efficiency, high equipment availability, low maintenance and safe operation. Simultaneously low NOx modification, installed due to stricter environmental legislation, require very careful combustion management. We aimed at gaining the relationship between burner flame image and emissions such as NOx and unburned carbon in furnace by utilizing the image processing method. For the first step of development, its possibility test was undertaken with bench furnace. The test proceeded to the second step with pilot furnace, the system was observed to be effective for evaluating the combustion conditions. By using this technology, it is possible to perform continuous monitoring of the combustion conditions and instant detection of individual changes for each burner to prevent future loss of ignition.

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자동차 엔진의 혼합연료가 엔진 성능과 배기가스에 미치는 영향에 관한 연구 (A Study on the Engine Performance and Emission of Gasoline-Methanol Blend in Vehicle Engine)

  • 조행묵
    • 한국분무공학회지
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    • 제4권3호
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    • pp.24-31
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    • 1999
  • The engine performance and combustion characteristics of methanol blended fuel of spark ignition engine were discussed on the basics of experimental investigation. The effects of methanol blending fuel on combustion in cylinder were investigated under various conditions of engine cycle and blending fuel on combustion in cylinder were investigated tinder various conditions of engine cycle and blending ratios. The results showed thai the engine performance was influenced by the methanol blending ratio and the variations of operating conditions 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.

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전자제어식 직접분사 디젤 엔진 연소실내의 분무연소 특성에 관한 연구 (A study on the spray combustion characteristics in a cylinder of a D.I.diesel engine with the electronically controlled injector)

  • 정재우;김성중;이기형;선우명호
    • 한국자동차공학회논문집
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    • 제8권2호
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    • pp.50-56
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    • 2000
  • It is well known that the combustion phenomenon of diesel engine is an unsteady turbulent diffusion combustion. Therefore, the combustion performance of diesel engine is related to a complex phenomenon which involves the various factors of combustion, such as a injection pressure, injection timing, injection rate, and operation conditions of engine. In this study, the spray and the flame development processes in a single cylinder D.I. diesel visualization engine which uses the electronically controlled injection system were visualized to interpret the complicated combustion phenomenon by using high speed CCD camera. In addition, the cylinder pressure and heat release rate were also obtained in order to analyze the diesel combustion characteristics under several engine conditions.

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초음속 유입 유동 조건에 따른 공동을 포함한 덕트 내 초음속 연소 현상에 관한 실험적 연구 (Experimental Study on Supersonic Combustion Phenomena in the Cavity Duct by the Supersonic Inflow Conditions)

  • 정은주;정인석
    • 한국연소학회:학술대회논문집
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    • 한국연소학회 2006년도 제33회 KOSCO SYMPOSIUM 논문집
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    • pp.209-219
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    • 2006
  • The supersonic combustion experiments are carried out using T3 free-piston shock tunnel. Different shock tube fill pressures have various inflow conditions. $15^{\circ}$ inclined hydrogen fuel injection is located before the cavity. Oblique shock is generated at the trailing edge of the cavity and reflects off the top and bottom wall. For non-reacting flow, static pressures in low equivalence ratio are similar to those in no fuel injection. As equivalence ratio is increased, static pressures are increased in the duct. In the similar equivalence ratio, static pressures are increased when total enthalpy is decreased. For reacting flow, the flame is occurred near the cavity. The combustion is weak locally in the middle of the duct. The up and down pressure distribution in the duct means that the supersonic combustion is generated.

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실시간 연소제어를 위한 화염 내 라디칼 계측기법 연구 (An Experimental Study on the Measurement of Radicals in Flame for Real Time Combustion Control)

  • 신명철;김세원;류태우;권승진
    • 한국연소학회지
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    • 제11권3호
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    • pp.18-25
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    • 2006
  • The present studying is aimed to establish the relationship between flame chemiluminescence$(OH^*,\;CH^*,\;C_2^*)$ intensities and combustion conditions such as $NO_x$ emission characteristics. Measurements are made for $OH^*,\;CH^*,\;C_2^*$ radicals in gas & light oil diffusion flames. At turbulent nonpremixed combustion mode, the equivalence ratio is varied. The optical emissions were measured by photomultiplier(PMT) using optical band pass filter and spectrometer system. The experimental results showed that the ratio of radicals and $NO_x$ emission characteristics have exponential correlations and equivalence ratio characteristics have linear correlations at this experimental conditions.

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담뱃불에 의한 훈소화재 특성에 관한 연구 (A Study on the Characteristics of Smouldering Fire by Cigarette Fires)

  • 황태연;이창우;최돈묵
    • 한국화재조사학회지
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    • 제11권1호
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    • pp.111-126
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    • 2007
  • 본 연구에서는 담뱃불 화재 연소특성에 대한 사례분석, 대기 중에서 담뱃불이 연소되는 시간, 담뱃불이 연소될 때 온도측정, 훈소가 가능한 물질의 연소실험, 담뱃불 화재재현실험을 통해 담뱃불화재 특성을 파악하여 담뱃불화재 감식기법 도출하였다. 담뱃불에 의해 화재가 발생되기 위해서는 산소공급, 가연물 조건 등을 충족할 때 화재로 진전됨을 알 수 있었으며, 반대로 그런 조건이 부합되지 않을 때는 쉽게 화재로 전이되지 않음을 알 수 있었다.

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발전용 가스엔진의 개발 및 연소특성에 관한 연구 (A Study on the Development and the Combustion Characteristics of a Stationary Gas Engine)

  • 김현규;우석근;전충환;장영준
    • Journal of Advanced Marine Engineering and Technology
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    • 제24권6호
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    • pp.128-139
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    • 2000
  • Environmental concerns and shortage of petroleum have promoted considerable interest in the use of alternate fuels in stationary diesel engine. In this study, a heavy-duty, intercooler-turbocharged 6-cylinder stationary diesel engine was converted into stationary gas engine fueled with propane or natural gas for the cogeneration plants. One of the most important factors in the combustion features of a stationary gas engine is the fuel composition and operating parameters in terms of compression ratio, spark advance, and engine loads. Experiments with different fuel gas and load conditions were carried out with combustion pressure analysis and NOx measurement. Combustion analysis based on P-$\theta$ diagrams was also investigated by means of combustion duration and cycle variation. Compression ratio is 10.0 and ignition timing is set by using the gasoline setting as a base line and advanced toward BTDC. The results show that fuel composition and spark advance have dominant effects on combustion and NOx characteristics at operating conditions.

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n-heptane 연료 혼합비에 따른 n-butanol 연료의 연소 특성 (Effect of Mixing Ratio of n-heptane Fuel on the Combustion Characteristics of n-butanol Fuel)

  • 임영찬;서현규
    • 한국연소학회지
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    • 제20권3호
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    • pp.21-26
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    • 2015
  • This study was performed to provide the information of the combustion characteristics of n-butanol fuel in accordance with the n-heptane fuel mixing ratio. The closed homogeneous reactor model was used for the analysis. The analysis conditions were set to 800 K of the initial temperature, 20 atm of initial pressure and 1.0 of equivalence ratio. The results of analysis were compared in terms of combustion temperature, combustion pressure, CO, Soot and $NO_X$ emissions. The results of combustion and exhaust emission characteristics showed that ignition delay was decreased and the combustion temperature was increased as the n-heptane mixing ratio was increased. Also, the carbon monoxide(CO) was slightly decreased however, the soot and nitrogen oxides($NO_X$) increased a little in accordance with the n-heptane fuel mixing ratio. In addition, the pressure difference was almost the same in any conditions.

축열식 고온공기 연소시스템에 대한 실험적 연구 (Experimental Study on High Temperature Air Regenerative Combustion System)

  • 양병옥;임인권
    • 한국연소학회:학술대회논문집
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    • 한국연소학회 1999년도 제19회 KOSCO SYMPOSIUM 논문집
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    • pp.189-200
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    • 1999
  • Combustion characteristics of a regenerative combustor for high temperature air combustion have experimentally studied. Temperature measurement on regenerative ceramic material and combustor has been carried out with changing equivalence ratio at constant turn-over period. Stable and unstable combustion region have been found and also detailed averaged temperature profile with respect to various air flow conditions have been obtained.

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직접분사식 커먼레일 단기통 디젤엔진에서 EGR율에 따른 연소 및 배기특성 (Effect of EGR Rate on Combustion and Emission Characteristics in a Single-cylinder Direct Injection Diesel Engine with Common-rail)

  • 허정윤;차준표;윤승현;이창식
    • 한국자동차공학회논문집
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    • 제19권2호
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    • pp.20-25
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    • 2011
  • The purpose of this work is an experimental investigation of combustion and emission characteristics in DI diesel engine applied high EGR rate as a method of low-temperature combustion. In order to analyze the effect of EGR rate variation, a single-cylinder DI diesel engine was operated under various EGR rate conditions. In addition, injection timing was variously controlled to investigate the effect of injection timing in DI diesel engine using the cooled-EGR system. The NOx emissions were decreased in accordance with the increase of EGR rate. On the contrary, soot emissions were generally increased under applied EGR conditions. However, soot emissions were decreased in a few injection timings under high EGR rate conditions. The EGR results show that the ignition delay were increased by decreased oxygen concentrations in combustion chamber under the high EGR rate.