DropletEvapBurn1Lect25ME525SP2011

DropletEvapBurn1Lect25ME525SP2011 - ME 525 Combustion...

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School of Mechanical Engineering, Purdue University ME 525: Combustion Lecture 25: Droplet Evaporation and Burning 1 Prof. Robert P. Lucht Room 87, Mechanical Engineering Building School of Mechanical Engineering Purdue University West Lafayette, Indiana [email protected] , 765-494-5623 (Phone) April 12, 2011
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School of Mechanical Engineering, Purdue University Lecture Topics • Model for droplet evaporation. • Definition of the Spalding number. • Droplet lifetimes. • Liquid fuels widely used in combustion, droplet evaporation and combustion very important especially in gas turbine engines, diesel engines, and rockets combustion chambers where evaporation and combustion occur simultaneously.
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School of Mechanical Engineering, Purdue University Evaporating Droplet r s T d = T s = T boil T r T boil
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School of Mechanical Engineering, Purdue University Model for the Evaporating Droplet Assume that Droplet evaporates in quiescent, infinite medium Evaporation process is quasi-steady (droplet radius changes slowly in time) Fuel is single-component, no dissolved gases Droplet temperature is uniform: T d = T boil T > T boil Le = 1 k g , c Pg , and g are constants evaluated at some mean temperature
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School of Mechanical Engineering, Purdue University Model for the Evaporating Droplet: Conservation Equations Gas Phase Conservation Equations: r > r s Mass Energy: for constant specific heat, spherical coordinates   2 v4 Fr m r m r const     2 2 1 v0 P rP dc d T d rc d T rd r d r     D 2 2 1 grp g g gp g dd T r c T const c r
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This note was uploaded on 12/27/2011 for the course ME 525 taught by Professor Lucth during the Fall '11 term at Purdue.

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DropletEvapBurn1Lect25ME525SP2011 - ME 525 Combustion...

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