Partially premixed combustion occurs in many combustion devices of practical interest, such as gas-turbine combustors. Development of corresponding turbulent combustion models is important to improve the design of these systems in efforts to reduce fuel consumption and pollutant emissions. Turbulent lifted flames have been a canonical problem for testing models designed for partially premixed turbulent combustion. In this paper we propose modifications to the coherent flame model so that it can be brought to the simulation of partially premixed combustion. For the primary premixed flame, a transport equation for flame area density is solved in which the wrinkling effects of the flame stretch and flame annihilation are considered. For the subsequent nonpremixed zone, a laminar flamelet presumed probability density function (PPDF) methodology, which accounts for the nonequilibrium and finite-rate chemistry effects, is adopted. The model is validated against the experimental data on a lifted jet flame issuing into a vitiated coflow. In general there is fairly good agreement between the calculations and measurements both in profile shapes and peak values. Based on the simulation results, the flame stabilization mechanism for lifted flames is investigated.
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Simulation of Turbulent Lifted Flames Using a Partially Premixed Coherent Flame Model
Yongzhe Zhang,
Yongzhe Zhang
CD-adapco
, 60 Broadhollow Road, Melville, NY 11747
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Rajesh Rawat
Rajesh Rawat
CD-adapco
, 60 Broadhollow Road, Melville, NY 11747
Search for other works by this author on:
Yongzhe Zhang
CD-adapco
, 60 Broadhollow Road, Melville, NY 11747
Rajesh Rawat
CD-adapco
, 60 Broadhollow Road, Melville, NY 11747J. Eng. Gas Turbines Power. May 2009, 131(3): 031505 (10 pages)
Published Online: February 10, 2009
Article history
Received:
April 4, 2008
Revised:
August 25, 2008
Published:
February 10, 2009
Citation
Zhang, Y., and Rawat, R. (February 10, 2009). "Simulation of Turbulent Lifted Flames Using a Partially Premixed Coherent Flame Model." ASME. J. Eng. Gas Turbines Power. May 2009; 131(3): 031505. https://doi.org/10.1115/1.3026559
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