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Autoignition of Dimethyl Ether and Air in an Optical Flow-Reactor

Schönborn, Alessandro LU ; Sayad, Parisa LU ; Konnov, Alexander LU and Klingmann, Jens LU (2014) In Energy & Fuels 28(6). p.4130-4138
Abstract
Autoignition of dimethyl ether in air was studied in a turbulent flow-reactor with optical access, at conditions relevant to micro gas turbine combustors. The ignition process was visualized using OH*-chemiluminescence imaging, showing the formation of multiple autoignition kernels along the central axis of the reactor. Ignition delays in the range of tau = 112-310 ms were measured at temperatures of T = 739-902 K, pressures of P = 0.2-0.4 MPa, equivalence ratios of phi = 0.225-0.675, and initial flow velocities of U-i = 8-46 m/s. The effect of adding nitrogen to the reactants as a diluent was investigated for mole fractions of additional nitrogen ranging from 0 < X-N2 < 0.1. The experimental ignition delays were compared with... (More)
Autoignition of dimethyl ether in air was studied in a turbulent flow-reactor with optical access, at conditions relevant to micro gas turbine combustors. The ignition process was visualized using OH*-chemiluminescence imaging, showing the formation of multiple autoignition kernels along the central axis of the reactor. Ignition delays in the range of tau = 112-310 ms were measured at temperatures of T = 739-902 K, pressures of P = 0.2-0.4 MPa, equivalence ratios of phi = 0.225-0.675, and initial flow velocities of U-i = 8-46 m/s. The effect of adding nitrogen to the reactants as a diluent was investigated for mole fractions of additional nitrogen ranging from 0 < X-N2 < 0.1. The experimental ignition delays were compared with homogeneous gas-phase chemical kinetic modeling. Comparison between the modeling and experiments showed significant discrepancies, but agreement was improved when heat transfer in the reactor was taken into account in the modeling. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Energy & Fuels
volume
28
issue
6
pages
4130 - 4138
publisher
The American Chemical Society
external identifiers
  • wos:000337783800063
  • scopus:84903154800
ISSN
0887-0624
DOI
10.1021/ef402476r
language
English
LU publication?
yes
id
83088a16-aebb-4576-a47c-28eb90262695 (old id 4609234)
date added to LUP
2014-08-28 15:30:56
date last changed
2017-09-10 03:57:55
@article{83088a16-aebb-4576-a47c-28eb90262695,
  abstract     = {Autoignition of dimethyl ether in air was studied in a turbulent flow-reactor with optical access, at conditions relevant to micro gas turbine combustors. The ignition process was visualized using OH*-chemiluminescence imaging, showing the formation of multiple autoignition kernels along the central axis of the reactor. Ignition delays in the range of tau = 112-310 ms were measured at temperatures of T = 739-902 K, pressures of P = 0.2-0.4 MPa, equivalence ratios of phi = 0.225-0.675, and initial flow velocities of U-i = 8-46 m/s. The effect of adding nitrogen to the reactants as a diluent was investigated for mole fractions of additional nitrogen ranging from 0 &lt; X-N2 &lt; 0.1. The experimental ignition delays were compared with homogeneous gas-phase chemical kinetic modeling. Comparison between the modeling and experiments showed significant discrepancies, but agreement was improved when heat transfer in the reactor was taken into account in the modeling.},
  author       = {Schönborn, Alessandro and Sayad, Parisa and Konnov, Alexander and Klingmann, Jens},
  issn         = {0887-0624},
  language     = {eng},
  number       = {6},
  pages        = {4130--4138},
  publisher    = {The American Chemical Society},
  series       = {Energy & Fuels},
  title        = {Autoignition of Dimethyl Ether and Air in an Optical Flow-Reactor},
  url          = {http://dx.doi.org/10.1021/ef402476r},
  volume       = {28},
  year         = {2014},
}