• Title/Summary/Keyword: LII/LIS

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Quantitative Measurements of Soot Particles in a Laminar Diffusion Flame Using a LII/LIS Technique (LII/LIS 기법을 이용한 층류확산화염 매연입자의 정량화)

  • Chung, J.W.;Lee, W.;Han, Y.T.;Kim, B.S.;Lee, C.B.;Kim, D.J.;Lee, K.H.
    • 한국연소학회:학술대회논문집
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    • 2002.11a
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    • pp.113-121
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    • 2002
  • The distribution of volume fraction, mean diameter and number density of soot particles are measured quantitatively in a co-flow ethylene diffusion flame using a simultaneous LII/LIS measurement technique. The LII/LIS system and the measured values are, respectively, calibrated and evaluated by comparing to the informations obtained from laser light. extinction/scattering experiments, LII signal shows some sensitivity to the laser light intensity when laser power density exceeds a certain value(threshold). It is also found that there is an optimal laser intensity and a delay time in order to obtain the best result using the simultaneous LII/LIS measurement technique.

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Quantitative Measurements of Soot Particles in a Laminar Diffusion Flame Using a LII/LIS Technique (LII/LIS 기법을 이용한 층류확산화염 매연입자의 정량화)

  • Chung, J.W.;Lee, W.;Han, Y.T.;Kim, B.S.;Lee, C.B.;Kim, D.J.;Lee, K.H.
    • Journal of the Korean Society of Combustion
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    • v.8 no.4
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    • pp.1-8
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    • 2003
  • In this study, the quantification of soot particles in laminar diffusion flame with LII/LIS methods was performed. In these quantification, soot diameter, number density and volume fraction are included. For the quatification of soot particles, calibration tests are needed and the development of algorithm has to be performed. So, in this study, extinction and scattering test at co-flow burner were performed to acquire calibration data. And algorithm for LII/LIS simultaneous measurement for the quantification of soot were developed. The algorithm, which was the quantification of simultaneous photographing using one ICCD camera, to measure LII/LIS signal simultaneously, the best fitted light intensity and acquisition time was needed.

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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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    • v.15 no.9
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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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Soot Measurement in an Optically Accessible Diesel Engine Using Laser Sheet (2nd reprot: The Measurement for diameter and number density of Soot) (레이저시트광을 이용한 가시화 디젤엔진에서의 Soot 계측(제2보 : Soot 입경분포 및 수밀도 계측))

  • 이명준;박태기;하종률;정성식
    • Transactions of the Korean Society of Automotive Engineers
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    • v.8 no.3
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    • pp.37-45
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    • 2000
  • The technique of laser sheet beam has been applied to optically accessible diesel engine for the quantitative measurement of soot. The results provide the information for us for reduction of soot in diesel engine. We used both LIS nad LII techniques simultaneously in this study. LIS and LII images show the quantitative distribution of the soot concentration in an optically accessible diesel engine. In this study, several results were obtained by the simultaneous measurement of LIS and LII technique. The diameter and number density of soot in combustion chamber of the test engine were obtained from ATDC 20$^{\circ}$ to 110$^{\circ}$ . The increase rate of soot diameter was about 40$^{\circ}$ between ATDC 20$^{\circ}$and 110$^{\circ}$. And the number density of soot decreased significantly between ATDC 20$^{\circ}$and 40$^{\circ}$.

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

  • Lee, J.S.
    • Journal of ILASS-Korea
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    • v.5 no.1
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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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Measurement technique for particle and soot of diesel injection by using a visualization method (가시화법을 이용한 디젤 인젝터의 액적과 soot의 측정 기술)

  • Chung, J.W.;Park, H.J.;Lee, K.H.;Lee, C.S.
    • Journal of ILASS-Korea
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    • v.6 no.2
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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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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 (레이저시트광을 이용한 가시화 디젤엔진에서의 Soot 계측 제1보 : 가시화 디젤엔진의 제작 및 레이저를 이용한 Soot의 2D 화상촬영)

  • 이명준;박태기;하종률;정성식
    • Transactions of the Korean Society of Automotive Engineers
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    • v.8 no.2
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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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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 (레이저 탄성산란법, 여기적열법, 자발광을 이용한 직분식 디젤엔진의 피스톤 형상에 따른 2차원 soot 분포 측정)

  • Noh, S.M.;Won, Y.H.;Park, J.G.;Choi, I.Y.;Chun, K.M.
    • 한국연소학회:학술대회논문집
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    • 2000.12a
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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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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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    • v.18 no.7
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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.

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

  • Noh, S.M.;Won, Y.H.;Park, J.G.;Choi, I.Y.;Chun, K.M.
    • Proceedings of the KSME Conference
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    • 2000.11b
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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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