TY - GEN
T1 - Relations between global recirculation ratio and area ratio in combustors fired with jets
AU - Vaz, Daniel Cardoso
PY - 2011/1/1
Y1 - 2011/1/1
N2 - This paper deals with the conception of burners aiming at a desired value of recirculation ratio, KV. This is particularly important to flameless oxidation, a combustion technique relevant for heat processing applications. First, from physical reasoning, it is established that KV does not depend on injection velocity and is governed by the chamber-to-nozzles area ratio, α. Next, two fundamental configurations are studied with a numerical tool, to obtain curves that allow the estimation of the area ratio necessary to obtain a determined KV. In the particular case of the design of flameless oxidation jet-fired burners, values of α>40 should be sought. The results, presented in non-dimensional form, can be exploited in the design of systems based on jet entrainment to achieve dilution of the incoming fluid, whether in the combustion field or others.
AB - This paper deals with the conception of burners aiming at a desired value of recirculation ratio, KV. This is particularly important to flameless oxidation, a combustion technique relevant for heat processing applications. First, from physical reasoning, it is established that KV does not depend on injection velocity and is governed by the chamber-to-nozzles area ratio, α. Next, two fundamental configurations are studied with a numerical tool, to obtain curves that allow the estimation of the area ratio necessary to obtain a determined KV. In the particular case of the design of flameless oxidation jet-fired burners, values of α>40 should be sought. The results, presented in non-dimensional form, can be exploited in the design of systems based on jet entrainment to achieve dilution of the incoming fluid, whether in the combustion field or others.
KW - non-reacting flow
KW - recirculation ratio
KW - combustor
KW - jet
KW - numerical simulation
M3 - Other contribution
VL - 9
ER -