Influence of the laminar burning velocity on the transfer functions of premixed methane and propane swirl flames
KAUST DepartmentClean Combustion Research Center
Mechanical Engineering Program
Physical Science and Engineering (PSE) Division
high-pressure combustion (HPC) Research Group
Online Publication Date2019-11-05
Print Publication Date2019-06-17
Permanent link to this recordhttp://hdl.handle.net/10754/660633
MetadataShow full item record
AbstractThe 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.
CitationDi 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/gt2019-90870
SponsorsThis work is funded by the King Abdullah University of Science and Technology and by the Deutsche Forschungsgemeinschaft through the GECCO project.
Conference/Event nameASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition, GT 2019