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Technical Brief

EVALUATION OF LEAN BLOW-OUT MECHANISM IN TOROIDAL JET STIRRED REACTOR

[+] Author and Article Information
Yifei Guan

Department of Mechanical Engineering, University of Washington, University of Washington, Mechanical Engineering, Stevens Way, Box 352600, Seattle, WA 98195
gyf135@uw.edu

Igor Novosselov

Department of Mechanical Engineering, University of Washington, University of Washington, Mechanical Engineering, Stevens Way, Box 352600, Seattle, WA 98195
ivn@uw.edu

1Corresponding author.

ASME doi:10.1115/1.4040091 History: Received September 05, 2017; Revised March 19, 2018

Abstract

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 3D 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 Da number in the reactor is the highest in the stabilization vortex; it varies from about Da~2 at ?=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 non-uniformity 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.

Copyright (c) 2018 by ASME
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