Relations between global recirculation ratio and area ratio in combustors fired with jets

Research output: Other contribution


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.
Original languageUnknown
Publication statusPublished - 1 Jan 2011

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