Vorticity generation and attenuation as vortices convect through a premixed flame

摘要: Abstract A sequence of PIV images shows the time history both vorticity field and velocity as vortices different strength convect through a premixed flame. The represent individual eddies in turbulent flow; goal is to understand how each eddy wrinkles flame also may alter eddy. It found that weak are completely attenuated primarily due volume expansion. Strong do survive passage, but only if they can weaken stretch effects. Intense flame-generated measured which has magnitude exceeds incident vortex some cases. products induces tends reduce amplitude wrinkling; thus it acts an additional flame-stabilizing mechanism. This mechanism affects wrinkling process should be included models. new nondimensional enhancement parameter ( E ) suggested way estimate effect size, strength, Reynolds number, Froude number on attenuation production. Measurements made for approximately equal 0, −1, −2, corresponding no change vorticity, total vortex, respectively. Buoyancy forces important one case considered, not other results used quantify size small neglected large simulations; role estimated example.