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Title:Flames in Straining Flows
Author(s):Mikolaitis, David Walter
Department / Program:Theoretical and Applied Mechanics
Discipline:Theoretical and Applied Mechanics
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Applied Mechanics
Abstract:In Chapt. 2, a model is proposed for flammability limits based on flame stretch that is applicable to upward propagation through lean methane/air mixtures in round tube. Predictions of the model are in good agreement with experiment.
In Chapt. 3, premixed flames in a rear stagnation point flow are studied using activation energy asymptotics. Multiple steady states are uncovered and a linear stability analysis defines those portions of the response that are physically attainable. Variations of the flow-rate at blow-off with equivalence ratio are predicted and compared with experimental data.
In Chapt. 4, a premixed flame located in a counterflow of fresh cold mixture and hot burnt gas, the latter at a temperature close to that of adiabatic deflagration, is examined. A constant density, high activation energy model is adopted, and the steady state response depends essentially on two parameters, the Lewis number, and the temperature of the remote hot gas. If the second is small enough, the response of flame position to changes in straining rate is a variation of the familiar S-shaped response for systems that display ignition and extinction. The possible implications for the flammability model of Chapt. 2 are discussed. The stability of the steady state under the influences of one-dimensional disturbances is examined in detail using the numerical method of weighted residuals.
Issue Date:1981
Description:111 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1981.
Other Identifier(s):(UMI)AAI8203534
Date Available in IDEALS:2014-12-16
Date Deposited:1981

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