AbstractThe understanding and the prediction of the phenomena involved in turbulent combustion appear as complicated problems if quantitative calculations in practical cases are required.A new calculation method for premixed turbulent flames is proposed here, based on the expected shape of the probability density function of the temperature or concentration fluctuations. The model, assuming a single-step global reaction, is restricted to non stoechimetric mixture, but involves a strong dependance (with any activation energy) of the reaction rate with temperature, and can be applied to extreme cases of turbulence controlled or chemically controlled combustion, as well as to intermediate cases.The application of this method in the case of recent experiments with a premixed CH4-air flame initiated by a pilot jet is shown to be satisfactory; in particular, a characteristic thickening of the flame zone, due to the presence of separate pockets of hot but burnt or unburnt but low temperature gases in the flow, is put into evidence. However, a more complete turbulence model, involving a turbulence scale length equation, is expected to lead to a finer agreement.
Turbulent combustion in a premixed flow
Acta Astronautica ; 4 , 3-4 ; 321-341
1976-10-07
21 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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