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Visualization of Different Flashback Mechanisms for H-2/CH4 Mixtures in a Variable-Swirl Burner

Sayad, Parisa LU ; Schönborn, Alessandro LU ; Li, Mao LU and Klingmann, Jens LU (2014) ASME Turbo Expo: Turbine Technical Conference and Exposition In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition 3A.
Abstract
Flame flashback from the combustion chamber to the premixing section is a major operability issue when using high H-2 content fuels in lean premixed combustors. Depending on the flow-field in the combustor, flashback can be triggered by different mechanisms. In this work, three flashback mechanisms of H-2/CH4 mixtures were visualized in an atmospheric variable swirl burner using high speed OH chemiluminescence imaging. The H-2 mole fraction of the tested fuel mixtures varied between 0.1 and 0.9. The flow-field in the combustor was varied by changing the swirl number from 0.0 to 0.66 and the total air mass-flow rate from 75 to 200 SLPM (standard liters per minute). The following three types of flashback mechanism were observed: Flashback... (More)
Flame flashback from the combustion chamber to the premixing section is a major operability issue when using high H-2 content fuels in lean premixed combustors. Depending on the flow-field in the combustor, flashback can be triggered by different mechanisms. In this work, three flashback mechanisms of H-2/CH4 mixtures were visualized in an atmospheric variable swirl burner using high speed OH chemiluminescence imaging. The H-2 mole fraction of the tested fuel mixtures varied between 0.1 and 0.9. The flow-field in the combustor was varied by changing the swirl number from 0.0 to 0.66 and the total air mass-flow rate from 75 to 200 SLPM (standard liters per minute). The following three types of flashback mechanism were observed: Flashback caused by combustion induced vortex breakdown occurred at swirl numbers >= 0.53 for all of the tested fuel mixtures. Flashback in the boundary layer and flashback due to autoignition were observed at low swirl numbers and low total air mass-flow rates. The temporal and spatial propagation of the flame in the optical section of the premixing tube during flashback was studied and flashback speed for different mechanisms was estimated. The flame propagation speed during flashback was significantly different for the different mechanisms. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
volume
3A
pages
12 pages
publisher
Amer Soc. Mechanical Engineers
conference name
ASME Turbo Expo: Turbine Technical Conference and Exposition
external identifiers
  • WOS:000362057900015
  • Scopus:84961350161
ISBN
978-0-7918-4565-3
DOI
10.1115/GT2014-27090
language
English
LU publication?
yes
id
80a6fe79-6111-4644-a81c-3dbecdc5e651 (old id 8227420)
date added to LUP
2015-11-27 12:32:06
date last changed
2016-10-30 04:39:12
@misc{80a6fe79-6111-4644-a81c-3dbecdc5e651,
  abstract     = {Flame flashback from the combustion chamber to the premixing section is a major operability issue when using high H-2 content fuels in lean premixed combustors. Depending on the flow-field in the combustor, flashback can be triggered by different mechanisms. In this work, three flashback mechanisms of H-2/CH4 mixtures were visualized in an atmospheric variable swirl burner using high speed OH chemiluminescence imaging. The H-2 mole fraction of the tested fuel mixtures varied between 0.1 and 0.9. The flow-field in the combustor was varied by changing the swirl number from 0.0 to 0.66 and the total air mass-flow rate from 75 to 200 SLPM (standard liters per minute). The following three types of flashback mechanism were observed: Flashback caused by combustion induced vortex breakdown occurred at swirl numbers >= 0.53 for all of the tested fuel mixtures. Flashback in the boundary layer and flashback due to autoignition were observed at low swirl numbers and low total air mass-flow rates. The temporal and spatial propagation of the flame in the optical section of the premixing tube during flashback was studied and flashback speed for different mechanisms was estimated. The flame propagation speed during flashback was significantly different for the different mechanisms.},
  author       = {Sayad, Parisa and Schönborn, Alessandro and Li, Mao and Klingmann, Jens},
  isbn         = {978-0-7918-4565-3},
  language     = {eng},
  pages        = {12},
  publisher    = {ARRAY(0xa5a4618)},
  series       = {ASME Turbo Expo 2014: Turbine Technical Conference and Exposition},
  title        = {Visualization of Different Flashback Mechanisms for H-2/CH4 Mixtures in a Variable-Swirl Burner},
  url          = {http://dx.doi.org/10.1115/GT2014-27090},
  volume       = {3A},
  year         = {2014},
}