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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Characterization of the flame front inversion of Ethanol-Air deflagrations inside A closed tube

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Author(s):
Mendiburu, Andres Z. [1] ; Serra, Jr., Aguinaldo M. [2] ; Andrade, Jose C. [2] ; Silva, Lucas M. [3] ; Santos, Jose C. [2] ; de Carvalho, Jr., Joao A. [3]
Total Authors: 6
Affiliation:
[1] Univ Fed Rio Grande do Sul, Dept Mech Engn, R Sarmento Leite 425, BR-90050170 Porto Alegre, RS - Brazil
[2] Natl Space Res Inst INPE, Combust & Prop Lab, Rod Pres Dutra, Km 39, BR-12630000 Cachoeira Paulista, SP - Brazil
[3] Sao Paulo Univ UNESP, Sch Engn, Dept Energy, Ave Ariberto P da Cunha 333, BR-12510410 Guaratingueta, SP - Brazil
Total Affiliations: 3
Document type: Review article
Source: ENERGY; v. 187, NOV 15 2019.
Web of Science Citations: 1
Abstract

Ethanol-air deflagrations were experimentally studied inside a closed tube by varying the equivalence ratio (0.9-1.4) and the initial pressure (20-60 kPa). The flame front inversion phenomenon was observed in all tests. It was determined that the ratio of the distance of flat flame formation to the hydraulic diameter (d(f)/d(h)) is a measurable parameter that allows the characterization of the phenomenon. For ethanol-air mixtures two dimensionless parameters can be used to correlate d(f)/d(h), namely, the ratio of the laminar flame speed to the speed of sound of the reactants (S-L/C-S,C-0) and the dimensionless distance travelled by the flame tip up to the time when the flame touches the lateral walls of the tube (xi(tip,wall)) . Two correlations were obtained and the averages of the absolute values of the relative errors (AARE) were less than 1.2%. Another correlation was obtained considering published data of different fuel-air mixtures. A statistical analysis applied considering experimental data from published literature and from this work, showed an AARE of 8.95% and a coefficient of multiple determination (R-2) of 0.79. The p-values of the regression coefficients were lower than 0.001. Therefore, the correlations present good accuracy and can be used for prediction. (C) 2019 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 15/25435-5 - FLAME PROPAGATION AND SUPPRESSION OF ANHYDROUS ETHANOL - AIR FLAMES.
Grantee:João Andrade de Carvalho Junior
Support type: Regular Research Grants
FAPESP's process: 15/23351-9 - FLAME PROPAGATION AND SUPPRESSION OF ANHYDROUS ETHANOL - AIR MIXTURES.
Grantee:Andrés Armando Mendiburu Zevallos
Support type: Scholarships in Brazil - Post-Doctorate