Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Numerical Investigation on Soot Primary Particle Size Using Time Resolved Laser Induced Incandescence (TIRE-LII)

시분해 레이저 유도 백열법을 이용한 매연 입자 크기에 관한 수치적 연구

  • 이종호 (부산대학교 대학원 기계공학과) ;
  • 김정용 (부산대학교 대학원 기계공학과) ;
  • 정동수 (한국기계연구원 엔진환경그룹) ;
  • 장영준 (부산대학교 기계공학부 기계기술연구소) ;
  • 전충환 (부산대학교 기계공학부)
  • Published : 2005.09.01
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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.

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References

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