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Nonlinear evolution of 2D cellular lean hydrogen/air premixed flames with varying initial perturbations in the elevated pressure environment

Yu, J. F. LU ; Yu, R. LU ; Bai, X. S. LU ; Sun, M. B. and Tan, Jian-Guo (2017) In International Journal of Hydrogen Energy 42(6). p.3790-3803
Abstract

This paper reports on studies of cellular instability of lean hydrogen/air laminar premixed flames with an equivalence ratio of 0.6 at a 5 atm and a 25 atm pressure. Numerical simulations employing a detailed chemical kinetics mechanism and detailed transport properties are carried out to simulate the initial linear growth of instability as well as the nonlinear evolution of flames. At the initial linear growth stage, the amplitude of the initial sinusoidal shaped flame front grows exponentially. Later on, in the nonlinear evolution stage the flame front develops into a cellular surface with wavelengths and amplitudes different from its initial ones. At higher pressures, hydrodynamic instability is enhanced, due to smaller flame thermal... (More)

This paper reports on studies of cellular instability of lean hydrogen/air laminar premixed flames with an equivalence ratio of 0.6 at a 5 atm and a 25 atm pressure. Numerical simulations employing a detailed chemical kinetics mechanism and detailed transport properties are carried out to simulate the initial linear growth of instability as well as the nonlinear evolution of flames. At the initial linear growth stage, the amplitude of the initial sinusoidal shaped flame front grows exponentially. Later on, in the nonlinear evolution stage the flame front develops into a cellular surface with wavelengths and amplitudes different from its initial ones. At higher pressures, hydrodynamic instability is enhanced, due to smaller flame thermal thickness; the flame fronts are more chaotic. Chaotic flame fronts are captured during the nonlinear evolution stage and it is shown that the evolution is very sensitive to initial perturbations. Two phenomena in the nonlinear evolution process are observed, mode-lock and preferential choice of modes. Both of these appear in connection with the initial disturbances to the flame front. Sensitivity of the numerical results to numerical schemes and the computational setups is examined.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Elevated pressure, Flame instability, Initial perturbations, Nonlinear flame dynamics, Numerical errors, Premixed flames
in
International Journal of Hydrogen Energy
volume
42
issue
6
pages
14 pages
publisher
Elsevier
external identifiers
  • scopus:84996720356
  • wos:000396971400028
ISSN
0360-3199
DOI
10.1016/j.ijhydene.2016.07.059
language
English
LU publication?
yes
id
55e0af2c-c28e-451b-b9eb-9989a9a1e844
date added to LUP
2017-04-19 12:56:04
date last changed
2018-01-14 04:31:44
@article{55e0af2c-c28e-451b-b9eb-9989a9a1e844,
  abstract     = {<p>This paper reports on studies of cellular instability of lean hydrogen/air laminar premixed flames with an equivalence ratio of 0.6 at a 5 atm and a 25 atm pressure. Numerical simulations employing a detailed chemical kinetics mechanism and detailed transport properties are carried out to simulate the initial linear growth of instability as well as the nonlinear evolution of flames. At the initial linear growth stage, the amplitude of the initial sinusoidal shaped flame front grows exponentially. Later on, in the nonlinear evolution stage the flame front develops into a cellular surface with wavelengths and amplitudes different from its initial ones. At higher pressures, hydrodynamic instability is enhanced, due to smaller flame thermal thickness; the flame fronts are more chaotic. Chaotic flame fronts are captured during the nonlinear evolution stage and it is shown that the evolution is very sensitive to initial perturbations. Two phenomena in the nonlinear evolution process are observed, mode-lock and preferential choice of modes. Both of these appear in connection with the initial disturbances to the flame front. Sensitivity of the numerical results to numerical schemes and the computational setups is examined.</p>},
  author       = {Yu, J. F. and Yu, R. and Bai, X. S. and Sun, M. B. and Tan, Jian-Guo},
  issn         = {0360-3199},
  keyword      = {Elevated pressure,Flame instability,Initial perturbations,Nonlinear flame dynamics,Numerical errors,Premixed flames},
  language     = {eng},
  month        = {02},
  number       = {6},
  pages        = {3790--3803},
  publisher    = {Elsevier},
  series       = {International Journal of Hydrogen Energy},
  title        = {Nonlinear evolution of 2D cellular lean hydrogen/air premixed flames with varying initial perturbations in the elevated pressure environment},
  url          = {http://dx.doi.org/10.1016/j.ijhydene.2016.07.059},
  volume       = {42},
  year         = {2017},
}