Title of article :
Linear and non-linear forced response of a conical, ducted, laminar premixed flame
Author/Authors :
Karimi، نويسنده , , Nader and Brear، نويسنده , , Michael J. and Jin، نويسنده , , Seong-Ho and Monty، نويسنده , , Jason P.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2009
Pages :
12
From page :
2201
To page :
2212
Abstract :
This paper presents an experimental study on the dynamics of a ducted, conical, laminar premixed flame subjected to acoustic excitation of varying amplitudes. The flame transfer function is measured over a range of forcing frequencies and equivalence ratios. In keeping with previous works, the measured flame transfer function is in good agreement with that predicted by linear kinematic theory at low amplitudes of acoustic velocity excitation. However, a systematic departure from linear behaviour is observed as the amplitude of the velocity forcing upstream of the flame increases. This non-linearity is mostly in the phase of the transfer function and manifests itself as a roughly constant phase at high forcing amplitude. Nonetheless, as predicted by non-linear kinematic arguments, the response always remains close to linear at low forcing frequencies, regardless of the forcing amplitude. The origin of this phase behaviour is then sought through optical data post-processing.
Keywords :
Non-linearity , thermoacoustics , Laminar premixed flame , Flame transfer function
Journal title :
Combustion and Flame
Serial Year :
2009
Journal title :
Combustion and Flame
Record number :
2274928
Link To Document :
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