Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
2D-Rayleigh Scattering Thermometry in Post-flame: Polarization Strategy
Submission Author:
Diego Jefferson de Oliveira , SP
Co-Authors:
Diego Jefferson de Oliveira, Gabriel Beividas Antunes, Maria Esther Sbampato, Luiz Gilberto Barreta, Leila Ribeiro dos Santos, Cristiane Aparecida Martins
Presenter: Diego Jefferson de Oliveira
doi://10.26678/ABCM.COBEM2017.COB17-0299
Abstract
2D-Laser-induced Rayleigh scattering thermometry (2D-LRST) was applied in temperature investigation of premixed natural gas (NG) flames. The experimental strategy used was the polarization technique employing a laser sheet. The scattering images with laser (266 nm) in the S-polarization and in the P–polarization directions (respectively, electric field perpendicular and parallel to the detection direction) were registered. Obtaining the difference between both signals, the spurious background radiation due to non-polarized scattering was discarded and the post-flames temperatures were determined. Experimentally, the temperature of a narrow region of each flame was firstly obtained with focused laser radiation. The experiments were repeated with the laser sheet and the temperature distribution were corrected multiplying the data by a calculated correction factor f. Experimental post-flames temperatures obtained in this paper presented values up to 301K lower than the adiabatic temperature calculated by the Gaseq program. This is due to significant heat losses to the environment for the low fuel mass flow used. The 2D-LRST using a laser sheet presents interferences that are difficult to avoid experimentally but good results are achieved if a correction of the temperature distributions in the flames is made based on the results obtained through scattering Rayleigh thermometry with focused laser radiation. Keywords: laser-induced Rayleigh
Keywords
Rayleigh thermometry, 2D-temperature distribution
