Lean blowout (LBO) prediction based on the local parameters in the laboratory toroidal jet-stirred reactor (TJSR) is investigated. The reactor operated on methane is studied using three-dimensional computational fluid dynamics (CFD); the results are compared with the experimental data. Skeletal chemical kinetic mechanism with the eddy dissipation concept (EDC) model is used. Flow bifurcation in the radial (poloidal) plane due to the interaction between counter-rotating vortices creates one dominating poloidal recirculation zone (PRZ) and one weaker toroidal recirculation zone (TRZ). The Damkohler (Da) number in the reactor is the highest in the stabilization vortex; it varies from about Da ∼ 2 at ϕ = 0.55 to Da ∼ 0.2–0.3 at LBO conditions. Due to the reduced turbulent dissipation rate in PRZ, the Da number is an order of magnitude higher than in TRZ. The global blowout event is predicted at the local Da = 0.2 in PRZ. Local blowout events in the regions of low Da can lead to flame instability and to a global flame blowout at a higher fuel–air ratio than predicted by the CFD. Local Da nonuniformity can be used for optimization and analysis of combustion system stability. Further research in the process parameterization and application to the practical combustion system is needed.
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October 2018
Technical Briefs
Damkohler Number Analysis in Lean Blow-Out of Toroidal Jet Stirred Reactor
Yifei Guan,
Yifei Guan
Department of Mechanical Engineering,
University of Washington,
Stevens Way,
Box 352600,
Seattle, WA 98195
e-mail: gyf135@uw.edu
University of Washington,
Stevens Way,
Box 352600,
Seattle, WA 98195
e-mail: gyf135@uw.edu
Search for other works by this author on:
Igor Novosselov
Igor Novosselov
Department of Mechanical Engineering,
University of Washington,
Stevens Way,
Box 352600,
Seattle, WA 98195
e-mail: ivn@uw.edu
University of Washington,
Stevens Way,
Box 352600,
Seattle, WA 98195
e-mail: ivn@uw.edu
Search for other works by this author on:
Yifei Guan
Department of Mechanical Engineering,
University of Washington,
Stevens Way,
Box 352600,
Seattle, WA 98195
e-mail: gyf135@uw.edu
University of Washington,
Stevens Way,
Box 352600,
Seattle, WA 98195
e-mail: gyf135@uw.edu
Igor Novosselov
Department of Mechanical Engineering,
University of Washington,
Stevens Way,
Box 352600,
Seattle, WA 98195
e-mail: ivn@uw.edu
University of Washington,
Stevens Way,
Box 352600,
Seattle, WA 98195
e-mail: ivn@uw.edu
1Corresponding author.
Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received September 5, 2017; final manuscript received March 19, 2018; published online June 25, 2018. Assoc. Editor: Joseph Zelina.
J. Eng. Gas Turbines Power. Oct 2018, 140(10): 104501 (4 pages)
Published Online: June 25, 2018
Article history
Received:
September 5, 2017
Revised:
March 19, 2018
Citation
Guan, Y., and Novosselov, I. (June 25, 2018). "Damkohler Number Analysis in Lean Blow-Out of Toroidal Jet Stirred Reactor." ASME. J. Eng. Gas Turbines Power. October 2018; 140(10): 104501. https://doi.org/10.1115/1.4040091
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