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Technical Brief

Damkohler Number Analysis in Lean Blow-Out of Toroidal Jet Stirred Reactor

[+] Author and Article Information
Yifei Guan

Department of Mechanical Engineering,
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

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 140(10), 104501 (Jun 25, 2018) (4 pages) Paper No: GTP-17-1495; doi: 10.1115/1.4040091 History: Received September 05, 2017; Revised March 19, 2018

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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Figures

Grahic Jump Location
Fig. 1

Computational domain with the boundary conditions and major flow patterns. The model includes two jets angled at 20 deg from the radial direction.

Grahic Jump Location
Fig. 2

Section view of the toroidal reactor, ϕ = 0.548, vectors colored by temperature. The strong PRZ displaces the inlet jet downward, the jets penetrate into the TRZ, breaking the coherent poloidal vortex below the jet. The transitional zone sheathes the entrainment of the flow from the TRZ. The maximum temperature is 1667 K.

Grahic Jump Location
Fig. 3

The CO and OH mass fractions of a stable solution and at the incipient blowout. The maximum CO mass fraction at the incipient blowout is about 9.63 × 10−3 kgOH/kgtotal. The maximum OH mass fraction at the incipient blowout is about 7.05 × 10−4 kgOH/kgtotal.

Grahic Jump Location
Fig. 4

Da number contours of a stable solution and at the incipient LBO

Grahic Jump Location
Fig. 5

Temperature data and numerical solution. The CFD temperature is taken 5 mm from the wall of the lower toroid. Zonal Da number is calculated based on the CFD solution. The CFD solution shows nonlinear trends in the region below the experimental LBO. The skeletal mechanism based on GRI 3.0 by Karalus et al. [22] is used.

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