Turbulent combustion (Lecture 3) Non-premixed flames
Turbulent combustion (Lecture 3) Non-premixed flames
Turbulent combustion (Lecture 3) Non-premixed flames
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Edge <strong>flames</strong> in low Le mixtures!<br />
Diffusive-thermal instability for Lewis number 1!<br />
High Le - imaginary growth rates - pulsating, travelling waves!<br />
Low Le - real growth rates with maximum value at finite wave<br />
number - cellular <strong>flames</strong>!<br />
Low-Le instability well known for <strong>premixed</strong> <strong>flames</strong>!<br />
Encouraged by heat losses (Joulin & Clavin, 1979), but near<br />
extinction conditions (high ε or low Da) not required !<br />
Discouraged by stretch (Sivashinsky et al., 1981)!<br />
Computations (Buckmaster & Short 1999; Daou & Liñán 1999)<br />
(<strong>premixed</strong>)!<br />
Le
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