Title of article :
An experimental study of the effects of equivalence ratio, mixture velocity and nitrogen dilution on methane/oxygen pre-mixed flame dynamics in a meso-scale reactor
Author/Authors :
Sarrafan Sadeghi، نويسنده , , Soroush and Tabejamaat، نويسنده , , Sadegh and Baigmohammadi، نويسنده , , Mohammadreza and Zarvandi، نويسنده , , Jalal، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2014
Pages :
15
From page :
169
To page :
183
Abstract :
At the present study, the effects of nitrogen dilution, equivalence ratio and inlet mixture velocity on methane–oxygen premixed flame dynamics in a meso-scale reactor with inner diameter of 5 mm has been investigated experimentally. The methane–oxygen premixed flame formation zones and also dynamical behavior of the established flames in a meso-scale reactor have been explored. In this research, the presence of five flame regimes of blow-off, blowout, normal asymmetric, repetitive extinction and re-ignition (RERI), and flashback have been observed. Based on the results of this study, it can be inferred that by increasing the inlet mixture velocity, the equivalence ratio should be decreased from fuel rich values toward the stoichiometric value for establishing the flame in a meso-scale reactor. In addition, it has been shown that by increasing the inlet mixture velocity more than a critical value, RERI type of flame may occur. Moreover, increasing the dilution percent at a constant flow rate of oxygen restricted the asymmetric stable flame region and simultaneously extended RERI and blowout regions for the various values of entrance mixture velocities versus equivalence ratio. On the contrary, decreasing the dilution percent (to lower than a critical value) could lead the flame to flashback. Also, it was shown that only the asymmetric flame could be formed as a stable flame in such a meso-scale reactor. Moreover, increasing the equivalence ratio to the fuel rich side moved the flame location toward the reactor outlet.
Keywords :
Oxygen , dilution , Meso-scale reactor , Asymmetric flame , RERI , Methane
Journal title :
Energy Conversion and Management
Serial Year :
2014
Journal title :
Energy Conversion and Management
Record number :
2337633
Link To Document :
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