Experimental and Numerical Study of Transient Laminar Counterflow Diffusion Flames
F. Aguerre,. N. Darabiha, J. C. Rolon, S. Candel
Laboratoire EM2C, CNRS, Ecole Centrale Paris,
92295 Chatenay-Malabry cedex, France
Страницы: 61-66
Аннотация
In the present article, we analyze the nonsteady behaviour of counterflow diffusion flames submitted to a time dependent injection velocity in the case of hydrogen — air flames. The numerical study, using a finite difference implicit Linear Multistep Method and employing complex kinetics, is done for sinusoidal injection velocity variations, for moderate values and also for values near the extinction limit. The frequency response is obtained in these different cases. The experimental setup comprises two axisymmetric nozzles. In order to change the inlet velocities periodically, we use a vibrating mechanism in each burner. The amplitude and the frequency of injection velocities of the opposed nozzles are synchronously modified. The OH radical emission intensity is used to measure the flame response to velocity fluctuations. The experimental results are compared to numerical calculations. A good concordance is obtained in this comparison.
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