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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|
|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.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1981.
|Date Available in IDEALS:||2014-12-16|
This item appears in the following Collection(s)
Dissertations and Theses - Theoretical and Applied Mechanics
Graduate Dissertations and Theses at Illinois
Graduate Theses and Dissertations at Illinois