COBEM 2019

25th International Congress of Mechanical Engineering

EXPERIMENTAL STUDY ON CELLULAR INSTABILITY FOR SYNGAS MIXTURES UNDER ATMOSPHERIC AND ELEVATED PRESSURES

Submission Author: Loreto Pizzuti , SP
Co-Authors: Loreto Pizzuti, Leila Ribeiro dos Santos, Pedro Lacava
Presenter: Loreto Pizzuti

doi://10.26678/ABCM.COBEM2019.COB2019-0817

 

Abstract

This study experimentally determines how the cellular instabilities of syngas mixtures are affected by the simultaneous variation of composition, equivalence ratio and initial pressure. The experimental data of laminar burning velocity is obtained using a cylindrical constant-volume vessel with optical access and schlieren photography. The variables investigated are the initial pressure ranging from 1 to 5 bar, the ratios CO/H2, CO/CH4 ranging from 0.5 to 2 and the dilution ratio using CO2 and N2 ranging from 20 to 60 %. Other variables investigated are the fuel/oxidizer equivalence ratioand the CO2/N2 ratio ranging from 0.7 to 1.1 and 0.33 to 3, respectively. The influence of composition on the cellular instability is taken into account considering the effective Lewis number (LeEff), the thermal expansion ratio and the flame thickness. The expected results will show which parameter or combination of parameters more strongly influence the appearance of cellular instabilities.

Keywords

Cellular instability, syngas mixtures, laminar burning velocity, constant volume vessel

 

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