Abstract
In current literature, the information available in flame appearance and structure characteristics of inverse diffusion flames (IDF) is mostly related to hydrocarbon/air flames. In the frame of energy transition and decarbonisation context, the present study deals with the experimental study of H 2 / O 2 downward coflow multi-fuel-jet inverse diffusion flames. These flames were analysed in terms of Reynolds number R e and equivalence ratio ϕ , by direct visualisation and OH ∗ chemiluminescence diagnostics. Results point out three types of flame structure according to the oxidiser to fuel momentum ratio. Two reaction zones were also identified: a pure diffusion zone expanding in the outside periphery of the jet and a central reaction zone where non-premixed and partially premixed modes can coexist. Results show that the characteristics of the diffusion zones (thickness, length, location of the stoichiometric line) are mainly controlled by the oxygen momentum, while the central reaction zone depends on the strength of the momentum ratio and the oxygen jet momentum. • We examine the flame structure of H2/O2 downward coflow multi-fuel-jet inverse diffusion flames. • OH* chemiluminescence intensity and distribution in different inverse diffusion flames were studied. • Three types of flame structure were found according to the oxidiser to fuel momentum ratio. • Two reaction zones were identified: a pure diffusion zone upstream and non-premixed and partially premixed modes coexisting downstream.
Accepted Version (
Free)
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call