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http://dx.doi.org/10.3795/KSME-B.2005.29.9.1022

Numerical Investigation on Soot Primary Particle Size Using Time Resolved Laser Induced Incandescence (TIRE-LII)  

Lee, Jong-Ho (부산대학교 대학원 기계공학과)
Kim, Jeong-Yong (부산대학교 대학원 기계공학과)
Jeong, Dong-Soo (한국기계연구원 엔진환경그룹)
Chang, Young-June (부산대학교 기계공학부 기계기술연구소)
Jeon, Chung-Hwan (부산대학교 기계공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.29, no.9, 2005 , pp. 1022-1031 More about this Journal
Abstract
Temporal behavior of the laser induced incandescence (LII) signal is often used for soot particle sizing, which is possible because the cooling behavior of a laser heated particle is dependent on the particle size. In present study, LII signals of soot particles are modeled using two non-linear coupled differential equations deduced from the energy- and mass-balance of the process. The objective of this study is to obtain an appropriate calibration curve for determining primary particle size by comparing the gated signal ratio and double-exponential curve fitting methods. Not only the effects of laser fluence and gas temperature on the cooling behavior but also heat transfer mechanisms of heated soot particle have been investigated. The second-order exponential curve fitting showed better agreements with the LII signals than the gated signal ratio method which was based on the lust-order exponential curve fit. And the temporal decay rate of the LII signal and primary particle size showed nearly linear relationship, which was little dependent on the laser fluence. And it also could be reconfirmed that vaporization was dominant process of heat loss during first loons after laser pulse, then heat conduction played most important role while thermal radiation had little influence all the time.
Keywords
Soot Primary Particle Size; Time-Resolved Laser Induced Incandescence;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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