Influence of the laminar burning velocity on the transfer functions of premixed methane and propane swirl flames
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INFLUENCE OF THE LAMINAR BURNING VELOCITY ON THE TRANSFER FUNCTIONS OF PREMIXED METHANE AND PROPANE SWIRL FLMAES_GT2019-90870_Accepted version.pdf
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Accepted manuscript
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Conference PaperKAUST Department
Clean Combustion Research CenterMechanical Engineering Program
Physical Science and Engineering (PSE) Division
high-pressure combustion (HPC) Research Group
Date
2019-11-05Online Publication Date
2019-11-05Print Publication Date
2019-06-17Permanent link to this record
http://hdl.handle.net/10754/660633
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The effects of the laminar burning velocity (SL), on the transfer functions of propane-air and methane-air swirl flames is experimentally investigated. Five equivalence ratios for each fuel are selected, to yield different values of SL. The flame transfer function (FTF), is obtained by comparing the velocity fluctuations of the incoming flow, measured with a hot wire, to the heat release rate oscillations, collecting OH∗ chemiluminescence with a photomultiplier tube. Phase-locked images of OH∗ chemiluminescence are also acquired to analyze the flame dynamics during the forcing cycle. The unforced velocity fields are measured by particle image velocimetry to assess the effects of SL on the flow fields. Changing the laminar burning velocity affects mainly the gain around 176 Hz and 336 Hz. This paper focuses on 336 Hz. The flame vortex roll-up is recognized as a key parameter controlling the gain of the FTF around 336 Hz. The analysis highlights that SL influences the gain response around 336 Hz in two competing ways: first, it enhances the flame vortex roll-up and second, it affects the stabilization distance of the flame, which influences the vortex generated by acoustic forcing.Citation
Di Sabatino, F., Guiberti, T. F., Moeck, J. P., Roberts, W. L., & Lacoste, D. A. (2019). Influence of the Laminar Burning Velocity on the Transfer Functions of Premixed Methane and Propane Swirl Flames. Volume 4A: Combustion, Fuels, and Emissions. doi:10.1115/gt2019-90870Sponsors
This work is funded by the King Abdullah University of Science and Technology and by the Deutsche Forschungsgemeinschaft through the GECCO project.Publisher
American Society of Mechanical EngineersConference/Event name
ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition, GT 2019Additional Links
https://asmedigitalcollection.asme.org/GT/proceedings/GT2019/58615/Phoenix,%20Arizona,%20USA/1066749ae974a485f413a2113503eed53cd6c53
10.1115/GT2019-90870