TY - GEN
T1 - Propagating edge flame response to multiple stoichiometric gradients
AU - Kostka, Stanislav
AU - Carnell, William F.
AU - Renfro, Michael W.
PY - 2005
Y1 - 2005
N2 - A five-slot burner with contoured nozzle exit has been used to create multiple lifted partially-premixed flames in close proximity. The burner allows for the creation of a range of stoichiometric gradients below each of the edge flames, while also allowing for the ability to control the distance between stabilization points of the flames. The equivalence ratio gradient and separation distance were varied so that various flame interactions could be studied. For large gradients the edge flames showed very little interaction as both flames stabilized at similar liftoff heights and with similar flame shapes. As the composition gradient below the flames was decreased, the edge flames broadened leading to an aerodynamic interaction where a lift-off height difference between the two flames was observed. This bifurcation in edge flame stabilization has been previously reported by our group and is examined here in greater detail. As the gradient was further reduced, the neighboring flames merged and approached the structure of a single premixed flame. In this work, the change in the separation distance between stoichiometric points was varied by controlling the burner slot flow rates, and was found to impact the composition gradients leading to flame interactions. Rayleigh scattering measurements were performed to determine the concentration gradients of fuel below each edge flame studied, characterizing the stabilization scalar dissipation rates while also allowing for the determination of the stoichiometric separation distance.
AB - A five-slot burner with contoured nozzle exit has been used to create multiple lifted partially-premixed flames in close proximity. The burner allows for the creation of a range of stoichiometric gradients below each of the edge flames, while also allowing for the ability to control the distance between stabilization points of the flames. The equivalence ratio gradient and separation distance were varied so that various flame interactions could be studied. For large gradients the edge flames showed very little interaction as both flames stabilized at similar liftoff heights and with similar flame shapes. As the composition gradient below the flames was decreased, the edge flames broadened leading to an aerodynamic interaction where a lift-off height difference between the two flames was observed. This bifurcation in edge flame stabilization has been previously reported by our group and is examined here in greater detail. As the gradient was further reduced, the neighboring flames merged and approached the structure of a single premixed flame. In this work, the change in the separation distance between stoichiometric points was varied by controlling the burner slot flow rates, and was found to impact the composition gradients leading to flame interactions. Rayleigh scattering measurements were performed to determine the concentration gradients of fuel below each edge flame studied, characterizing the stabilization scalar dissipation rates while also allowing for the determination of the stoichiometric separation distance.
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M3 - Conference contribution
AN - SCOPUS:84946233194
T3 - Chemical and Physical Processes of Combustion - 2005 Technical Meeting of the Eastern States Section of the Combustion Institute
SP - 157
EP - 160
BT - Chemical and Physical Processes of Combustion - 2005 Technical Meeting of the Eastern States Section of the Combustion Institute
T2 - 2005 Technical Meeting of the Eastern States Section of the Combustion Institute: Chemical and Physical Processes of Combustion
Y2 - 13 November 2005 through 15 November 2005
ER -