Lean methane flame stability in a premixed generic swirl burner: Isothermal flow and atmospheric combustion characterization

摘要

Highlights?A generic swirl burner has been commissioned for fully premixed combustion studies.?Isothermal flow characterization suggests dominant aerodynamic instability frequencies.?V-shape to M-shape flame transition precedes onset of the lean blowoff instability.?Dynamic pressure and chemiluminescence intensity collapse prior to lean blowoff instability.?Blowoff instability characterized by low frequency extinction and reignition events.AbstractGas turbine combustors operating in lean premixed mode are known to be susceptible to flame blowoff due to competing influences of increasing chemical timescales and decreasing flow time scales under these conditions. In this study, combustion stability and the onset of flame blowoff in particular, are characterized in a new swirl burner operated with fully premixed meth