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6259383 
Book/Book Chapter 
Chapter 6 - Flashback Due to Combustion Instabilities 
Benim, AC; Syed, KJ 
2015 
Academic Press 
Boston 
Flashback Mechanisms in Lean Premixed Gas Turbine Combustion 
41-44 
In this chapter, combustion instabilities as a possible source of flashback are discussed based on several experimental and computational results of other authors. On a premixed propane/air laboratory flame, it is discussed that flashback can be triggered by an interaction of large vortices with the boundary layer. Instabilities were observed to lead to flashback at a high oscillation amplitude, where the characteristic oscillation velocity is comparable to the mean inlet velocity in magnitude. Investigations on a flame using methane/hydrogen fuel blends show that hydrogen addition increases flashback propensity due to combustion instabilities. In the flashback mode, the dominant frequency of pressure fluctuations gets shifted to a lower value, which is observed to be equal to that of the flashback activity. 
Dominant frequency; hydrogen addition; thermoacoustic instabilities; velocity and pressure fluctuations; vortex dynamics 
Syed, Khawar J.