• 제목/요약/키워드: LIS(Laser Induced Scattering)

검색결과 11건 처리시간 0.02초

Investigation of Soot Formation in a D.I. Diesel Engine by Using Laser Induced Scattering and Laser Induced Incandescence

  • Lee, Ki-Hyung;Chung, Jae-Woo;Kim, Byung-Soo;Kim, Sang-Kwon
    • Journal of Mechanical Science and Technology
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    • 제18권7호
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    • pp.1169-1176
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    • 2004
  • Soot has a great effect on the formation of PM (Particulate Matter) in D.I. (Direct Injection) Diesel engines. Soot in diesel flame is formed by incomplete combustion when the fuel atomization and mixture formation were poor. Therefore, the understanding of soot formation in a D.I. diesel engine is mandatory to reduce PM in exhaust gas. To investigate soot formation in diesel combustion, various measurements have been performed with laser diagnostics. In this study, the relative soot diameter and the relative number density in a DJ. engine was measured by using LIS (Laser Induced Scattering) and LII (Laser Induced Incandescence) methods simultaneously which are planar imaging techniques. And a visualization D.I. diesel engine was used to introduce a laser beam into the combustion chamber and investigate the diffusion flame characteristics. To find the optimal condition that reduces soot formation in diesel combustion, various injection timing and the swirl flow in the cylinder using the SCV (Swirl Control Valve) were applied. From this experiment, the effects of injection timing and swirl on soot formation were established. Effective reduction of soot formation is possible through the control of these two factors.

레이저시트광을 이용한 가시화 디젤엔진에서의 Soot 계측 제1보 : 가시화 디젤엔진의 제작 및 레이저를 이용한 Soot의 2D 화상촬영 (Soot Measurement in an Optically Accessible Diesel Engine Using Laser Sheet 1st report : The Development of Optically Accessible Diesel Engine and Photography of 2D Soot Images Using Laser Sheet)

  • 이명준;박태기;하종률;정성식
    • 한국자동차공학회논문집
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    • 제8권2호
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    • pp.64-71
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    • 2000
  • In order to clarify the characteristics of soot formation and oxidation in-cylinder of a diesel engine, it is necessary to diagnose accurately for combustion of in-cylinder. The past techniques for soot measurement have limitations in providing the characteristics of soot in a diesel engine, whereas, laser-based 2D imaging diagnostics have the potential to provide better temporally and spatially resolved measurements of the soot distribution. We rebuilt an optically accessible diesel engine which is similar to the conditions of a conventional engine and tried to measure soot distribution in a cylinder of the diesel engine using laser induced scattering(LIS) and laser induced incandescence(LII). Some results were acquired in this study. LIS and LII signal that show soot distribution of a in-cylinder were taken by ICCD properly. The signal of LIS was intenser than that of LII. Although they have some differences of signal intensity in early combusion period, both of signals show that they are generally similar in late combustion period, after ATDC 50 degree.

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레이저 탄성산란법, 여기적열법, 자발광을 이용한 직분식 디젤엔진의 피스톤 형상에 따른 2차원 soot 분포 측정 (Measurments of 2-D Image Soot Distribution for Different Piston-Shapes of a DI Diesel Engine Using Elastic Scattering, Laser-Induced Incandescence and Flame Luminosity)

  • 노승민;원영호;박정규;최인용;전광민
    • 한국연소학회:학술대회논문집
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    • 한국연소학회 2000년도 제21회 KOSCO SYMPOSIUM 논문집
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    • pp.183-193
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    • 2000
  • Soot formation and oxidation is closely related to the combustion phenomena inside a diesel engine. Laser-based diagnostics provide a means for improving our understanding of diesel combustion, because they have highly temporal and spatial ability. To understand the soot behavior we did preliminary study by taking flame luminosity photographs and 2-D images of soot distribution using Laser Elastic Scattering(LIS) and Laser-Induced Incandescence(LII). From the data we found that soot concentration was high in the bowl and disappeared from the central region in the late combustion stage and that soot exists in the flame using luminosity, LIS and LII.

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The 2D Measurement of Soot Diameter and Number Density in a Diesel Engine Using Laser Induced Methods

  • Lee, Myung-Jun;Yeom, Jung-Kuk;Ha, Jong-Yul;Chung, Sung-Sik
    • Journal of Mechanical Science and Technology
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    • 제15권9호
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    • pp.1311-1318
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    • 2001
  • It is necessary to diagnose accurately the characteristics of soot formation and oxidation in a diesel engine. Whereas past measurement techniques for soot concentration give limited information for soot, laser-based two-dimensional imaging diagnostics have a potential to provide temporally and spatially superior resolved measurements of the soot distribution. The technique using laser sheet beam has been applied to an optically accessible diesel engine for the quantitative measurement of soot. The results provided the information for reduction of soot from the diesel engine. Both LIS (Laser Induced Scattering) and LII (Laser Induced Incandescence) techniques were used simultaneously in this study. The images of LIS and LII showed the quantitative distribution of the soot concentration in the diesel engine. In this study, several results were obtained by the simultaneous measurements of LIS and LII technique. The diameter and number density of soot in combustion chamber of the test engine were obtained from ATDC 20 degree to 110 degree. The soot diameter increased about 37% between ATDC 20 degree and 110 degree. The number density of soot, however, decreased significantly between ATDC 40 degree and 70 degree.

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레이저 탄성산란법, 여기적열법, 자발광을 이용한 가시화 디젤엔진의 후기연소의 2차원 soot 분포 측정 (Measurments of 2-D Image Soot Distribution in Late Combustion Stage Using Elastic Scattering, Laser-Induced Incandescence and Flame Luminosity)

  • 노승민;원영호;박정규;최인용;전광민
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2000년도 추계학술대회논문집B
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    • pp.162-167
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    • 2000
  • Soot formation and oxidation is closely related to the combustion phenomena inside a diesel engine. Laser-based diagnostics provide a means for improving our understanding of diesel combustion, because they have highly temporal and spatial ability. To understand the soot behavior we did preliminary study by taking flame luminosity photographs and 2-D imaging soot distribution using Laser Elastic Scattering(LIS) and Laser-Induced Incandescence(LII). From the data we found that soot concentration was high in the bowl and disappeared from the central region in the late combustion stage.

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레이저 시트빔을 이용한 디젤엔진의 Soot 농도 계측 (Soot Concentration Measurement in Diesel Engine Using Laser Sheet Beam)

  • 이중순
    • 한국분무공학회지
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    • 제5권1호
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    • pp.23-29
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    • 2000
  • Recently the laser sheet technique has been developed to improve our limited understanding of the in-cylinder diesel combustion. The technique is capable of high temporal and spatial resolution, so that it is proved to be an adequate combustion diagnostics to find out exhaust emission formation. The optical signals of LIS(Laser Induced Scattering) and LII(Laser Induced Incandescence) images show informations for soot concentration within the optically accessible diesel engine. The LIS and LII signal images of soot concentration provide new insight into where and when soot occurs in a diesel engine.

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가시화법을 이용한 디젤 인젝터의 액적과 soot의 측정 기술 (Measurement technique for particle and soot of diesel injection by using a visualization method)

  • 정재우;박현종;이기형;이창식
    • 한국분무공학회지
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    • 제6권2호
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    • pp.22-28
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    • 2001
  • Recently, many researches have been performed to improve the combustion and emission in a D.I.Diesel engine. Especially reduction of the soot formation in the combustion chamber is the essential to acquire the improvement of the emission performance. This emission of the diesel combustion is effected by the characteristics of air-fuel mixing. Therefore, the optical measurement technique such as LII and LIS were established in order to visualize the distribution of the soot and analyze the particle including spray in the combustion chamber. In this study, we developed the algorithm for calculating relative diameter and density of particle and applied this method to measure stimultaneously the distribution of soot and spray in a D.I. diesel engine. From this experiment we found that the soot is existed in the rich region of spray and generated caused by incapable air fuel mixture.

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스월 유동이 직분식 디젤엔진 내의 Soot 분포에 미치는 영향에 관한 연구 (A Study on the Effects of the Swirl Flow on the Distribution of Soot in the D.I. Diesel Engine)

  • 이기형;정재우;이창식;박현종
    • 대한기계학회논문집B
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    • 제26권3호
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    • pp.458-464
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    • 2002
  • Recently, many researches have been performed to improve performances of the combustion and emission in the D.I.Diesel engine. Especially reduction of the soot formation in tole combustion chamber is the essential to acquire the improvement of the emission performance. These emission of the diesel combustion is effected by the characteristics of air-fuel mixing. Thus, in this study, the distribution of soot in the diesel combustion is measured by LII(laser induced incandescence) and LIS(Laser induced scattering) method. From this experimental results, it is confirmed that the swirl flow intensified by SCV(swirl control valve) is effective on the reduction of soot in the combustion chamber.

레이저 및 열전대를 이용한 동축류 확산화염에서의 매연입자 측정에 관한 연구 (A Study on the Soot Particle Measurement in Co-Flow Diffusion Flame Using a Laser Diagnostics and a Thermocouple)

  • 한용택;이기형;이원남
    • 대한기계학회논문집B
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    • 제28권7호
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    • pp.863-870
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    • 2004
  • The temperature and soot particle measurement technique in a laminar diffusion flame has been studied to investigate the characteristics of soot particle with temperature using a co-flow burner. The temperature distribution in the flame were measured by rapid insertion of a R-type thermocouple and the soot particles by LEM/LIS techniques. In these measurement, soot volume fraction, number density and soot diameters were analyzed experimentally. As a results, the spacial distributions of particle volume fraction, soot diameter, and number density are mapped throughout the flame using the Rayleigh theory for the scattering of light by particles. A laser extinction method was used to measure the soot volume fraction and laser induced scattering method was used to measure the soot particle diameter and number density. Also, we measured temperature without the effect of soot particles attached to the thermocouple junction, which is close to the nozzle. In this result, we found that upstream zone has a unstable flowing in co-flow diffusion flame and the y-axis temperature of flame has a uniform temperature distribution in the most soot volume fraction zone.

레이저 및 열전대를 이용한 동축류 확산화염에서의 매연입자 측정에 관한 연구 (A Study on the Soot Particle Measurement in Co-flow Diffusion Flame Using a Laser Diagnostics and a Thermocouple)

  • 한용택;이기형;이원남
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2004년도 춘계학술대회
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    • pp.1267-1273
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    • 2004
  • The temperature and soot particle measurement technique in a laminar diffusion flame have been studied to investigate the characteristics of soot particle with temperature using a co-flow burner. The temperature distributions in the flame were measured by rapid insertion of a R-type thermocouple and the soot particles were detected were detected by LEM/LIS techniques. In these measurement, soot volume fraction, number density and soot diameters were analyzed experimentally. As a results, the spacial distributions of particle volume fraction, soot diameter, and number density are mapped throughout the flame using the Rayleigh theory for the scattering of light by absorbing particles. A laser extinction method was used to measure the soot volume fraction and Laser induced scattering method was used to measure the soot particle diameter and number density. Also, we measured temperature without the effect of soot particles attached to the thermocouple junction, which is close to the nozzle. In this result, we found that upstream zone has a unstable flowing in co-flow diffusion flame and the y-axis temperature of flame has a uniform temperature distribution in the most soot volume fraction zone.

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