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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
Relevant Parameters on the Formation of Tulip Flames
Submission Author:
Júlia Silveira , RS
Co-Authors:
Júlia Silveira, Andrés Armando Mendiburu Zevallos
Presenter: Júlia Silveira
doi://10.26678/ABCM.ENCIT2020.CIT20-0190
Abstract
The objective of this work is to study the relevant parameters that can correlate to the distance of the onset of the formation of tulip flames inside a duct. For this, data were collected from articles involving experiments on tulip flames to relate the dimensionless parameters df/dh (ratio of the distance at which a flame becomes flat to the diameter of the tube) and SL/C0,S (ratio of laminar flame speed to the speed of sound of the reactants). The laminar flame speed and the speed of sound of reactants were calculated using the Cantera software. It was observed in the first part of the study that the best correlation is obtained when the aspect ratio (AR) is kept constant and the type of fuel is not greatly different, the data for mixtures of H2+CH4 correlate better than the data for mixtures of H2+CO. In the second part of the study it is observed by keeping constant the AR and the fuel type and letting the equivalence ratio to vary rather widely, the correlation coefficients show betters results and the R² ranged from 0,62 to 0,78. Comparing the experimental data with the available premixed flame acceleration theory the results show that a relative error below 25% is obtained for most of the data when the theory is used to determine df/dh.
Keywords
tulip flames, premixed flames, flame propagation, closed tubes, half-open tubes
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