E. E. Ekstedt has written:

'Clean catalytic combustor program' -- subject- s -: Fuel injection, Aircraft turbine combustor, Catalytic combustor, Low emission combustor

Due to turbulence of incoming air and/or fuel mass flow perturbations the heat release process will be periodic (Unsteady) so the pressure inside the combustor will fluctuate due to unsteady heat release rate causing broadband noise this noise will match with one or more of the acoustic modes (frequencies) of the combustor, then the humming will occur and if the humming reflected from the combustor boundaries to the flame again it will increase the root source of the problem (flow perturbations) and amplification of the oscillation will take place causing structural vibrations to the combustor walls (acceleration).

The second one

overseer - stompbox

Thomas James Rosfjord has written:

'Role of fuel chemical properties on combustor radiative heat load'