Numerical Simulation of Premix Combustion with Recirculation

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Presentation transcript:

Numerical Simulation of Premix Combustion with Recirculation MAE 5310 Final Presentation Fumitaka Goto Instructor:Dr.D.Kirk Dec13th,2005

Modeling of Gas Turbine Engines Flow Recirculation Unsteady Turbulence Mixing Phase change Chemical Kinetics Turbulence Combustion Flame Speed evaporation Large/Small Eddys…etc COMPLEX! Simulation of Flow within aPW gas turbine-combustor UofMinesota http://www.aem.umn.edu/research/ http://www.aircraftenginedesign.com/pictures/pw500.gif

Motivation Recirculation is observed within IC engines Simulation identifies hot temperature region Production of NOx and radicals Stress/strain on structures More economical than experiments Enables to predict lean fuel blow out (LBO) Fuel efficient design Safety Improvement http://www.cfdrc.com/bizareas/aerospace/combustion/

Alternative Topic: 2-DSimulation Axi-Symmetric Ceramic Combustor Laminar Flame let Experimental data available Discrepancy with Numerical Computation -One Point Probability Distribution Function 288K 60m/s (mm) Reactor Details with Contour of eddy lifetime 10-4 s (top) And turbulent heat release rate GW m-3 (bottom) [Derek]

Lean Methane-Air (f =0.84) [Derek]

Preliminarily Interest: Lean Methane-Air (f =0.63) [Derek]

Fluent Modeling-1 Finite Rate Chemistry 5 step mechanism [Fluent 6.2 User`s Guide] &[Kirk]

Convergence and Meshing Premix off Energy off 2nd Order Upwind E A B 1st Order D Ref: [Fluent Inc. July 6 2005 Tutorial]

Static Temperature Ref: [Fluent Inc. July 6 2005 Tutorial]

Molar Concentration CH4

Molar Concentration CO

Molar Concentration CO2

Molar Concentration O2

Molar Concentration H2O

Molar Concentration N2

Molar Concentration NO

Molar Concentration of CO2 &CO

Fluent Modeling -2 Zimount Model c mean reaction progress variable Dt the turbulent diffusivity _ ru density of the unburned mixture Ut the turbulent flame speed Global mechanism Fluent 6.2 User`s Guide and [Lipantikov]

Velocity Contour Zimount Zimount

Temperature B 5 step Finite Rate Zimount

Turbulent Kinetic Energy and Turbulent Flame Speed Sudden Expansion in Cross section area Increase due to mixing ? Velocity Increase due to recirculation

Reaction Rate

Conclusion & Recommendation Five Step Model needs modification 25 or 26 steps might give better correlation Zimount show the rate of global reaction, which is governed by oxidation of carbon dioxide. Further comparison between CFD and experiment necessary Also check the influence meshing schemes