TurbPremixedFlamesLects28&29ME525SP2011

TurbPremixedFlamesLects28&29ME525SP2011 - ME 525:...

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School of Mechanical Engineering, Purdue University ME 525: Combustion Lecture 28 &29: Premixed Turbulent Flames Prof. Robert P. Lucht Room 87, Mechanical Engineering Building School of Mechanical Engineering Purdue University West Lafayette, Indiana Email: Lucht@purdue.edu Phone: 765-494-5623 April 21 and 26, 2011 1/30
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School of Mechanical Engineering, Purdue University Lecture Topics • Introduction to turbulent flow. • Effect of turbulence on chemical reaction rates. • Structure of premixed turbulent flames. • Direct numerical simulation of premixed turbulent flames. 2/30
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School of Mechanical Engineering, Purdue University Introduction (Brief) to Turbulent Flow • Characterization in terms of mean and fluctuating properties  2 , vv v v v xx x x r m s x ii i t Tt T T Y t Y Y   Length Scales • Characteristic width of the flow, the macroscale: L • Integral scale or Taylor macroscale: 0 Mean size of the large eddies in a flow. Distance between two points in the flow where the correlation between the fluctuating velocities at two location goes to zero. 3/30
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School of Mechanical Engineering, Purdue University Introduction (Brief) to Turbulent Flow Length Scales (cont.) • Kolmogorov microscale: K The scale at which molecular dissipation effects are important. Turbulent kinetic energy is dissipated into fluid internal energy at this scale.   1/4 2 3 3 2 0 00 1/2 0 22 0 3 / v v turb rms K rms K KE t mm ss        4/30
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School of Mechanical Engineering, Purdue University Introduction (Brief) to Turbulent Flow • At the Kolmogorov microscale, the time for an eddy of size K to rotate is equal to the momentum diffusion time across the eddy.
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TurbPremixedFlamesLects28&29ME525SP2011 - ME 525:...

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