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Large Eddy Simulation of Flashback Phenomenon in a Lean Premixed Prevaporized Combustor
Received date: 2013-07-10
Revised date: 2014-02-10
Online published: 2014-03-11
To study the flashback phenomenon and formation mechanism in a lean premixed prevaporized (LPP) combustor, large eddy simulation (LES) and partially premixed combustion model are employed to study the flashback phenomenon based on an experiment conducted by Schneider. The cold flow field and combustion temperature are compared with experiment results, the accuracy of the model is verified. It is then used in the simulation of the occurrence and propagation of flashback within an LPP combustor. Detailed chemical mechanism is employed to predict the kerosene laminar and turbulent flame speed. The onset and propagation of the flashback is reproduced successfully. According to the observation of the flow field, the complicated vortex in the flow field plays an important role during the flashback onset and propagation. Further analysis of the vorticity equation for the structure of the vortex shows that the baroclinic torque and volume expansion induced by combustion may be the main cause of the flashback phenomenon in a gas turbine combustor.
QIAO Yingjie , MAO Ronghai . Large Eddy Simulation of Flashback Phenomenon in a Lean Premixed Prevaporized Combustor[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014 , 35(6) : 1505 -1512 . DOI: 10.7527/S1000-6893.2013.0538
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