2D MEASUREMENTS OF PRIMARY SOOT DIAMETER IN DIFFUSION FLAMES BY TWO-DIMENSIONAL TIME RESOLVED LASER INDUCED INCANDESCENCE (2D TIRE-LII) |
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| M. Potenza, F.Naccarato, A. de Risi |
- Abstract:
- Two dimensions primary soot diameter calculation in a laminar diffusion LPG flame by means of Laser Induced Incandescence (LII) is presented in present paper. LII is a high sensitive technique in which a high energy Nd-YAG laser sheet heats soot particles to a temperature of about 4000 K but without exceeding the sublimation temperature. Radiation from exited soot particles is acquired by means of an intensified CCD camera (low gate opening time of 10ns) synchronized with the laser pulse. By delaying the acquisition time with respect to laser pulse, LII signal decay as function of time has been reconstructed. Performing acquisition at two different wavelengths by means of two interferometric filters (Two color LII) a soot temperature behaviour (related to particles primary diameter) has been calculated. Using a self calibration method for optics and laser fluence and selfabsorption corrections for LII signal, bi dimensional quantitative measurements can be achieved for soot dimensions and distribution. Thanks to a center- of-mass alignment of flame within corrected images at different time steps, it is possible to achieve the soot decay curve for each pixel of images, thus obtaining two dimensional soot primary particles visualization.
- Keywords:
- 2D LII, Time Resolved LII, laminar diffusion flame, soot volume fraction
- Download:
- IMEKO-TC19-2013-027.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC19
- Event name:
- Protecting Environment, Climate Changes and Pollution Control
- Title:
- 4th Symposium on Environmental Instrumentation and Measurements
- Place:
- Lecce, ITALY
- Time:
- 03 June 2013 - 04 June 2013