Transition from turbulence-dominated to instability-dominated combustion regime in lean hydrogen-air flames
Artikel i vetenskaplig tidskrift, 2023
with appearance of such perturbations as the turbulence decays are scattered between 4 and 10 and are consistent within an order of magnitude to a recently proposed criterion (Chomiak and Lipatnikov, Phys. Rev. E 107: 015102, 2023) of importance for laminar flame instabilities in turbulent flows. Fourth, at such transition instants, a ratio of potential and solenoidal turbulent kinetic energies, averaged over the flame-brush leading edge, is close to 2.0 in 11 studied cases and a ratio of UT/SL varies between 3.0 and 3.5. Fifth, the maximum fuel consumption rate (over the computational domain) decreases as the turbulence decays. Thus, the initial maximum rates are significantly higher than the counterpart rate in the unstable laminar flame. Together these results show that the hypothesis that laminar flame instabilities play only a minor role at high Ka deserves further study.
Författare
Andrei Lipatnikov
Energiomvandling och framdrivningssystem
Hsu Chew Lee
Southern University of Science and Technology
B. Wu
Southern University of Science and Technology
Peng Dai
Southern University of Science and Technology
Minping Wan
Southern University of Science and Technology
Vladimir Sabelnikov
ONERA Centre de Palaiseau
Combustion and Flame
0010-2180 (ISSN) 15562921 (eISSN)
Vol. 259 113170Drivkrafter
Hållbar utveckling
Styrkeområden
Transport
Ämneskategorier
Energiteknik
Strömningsmekanik och akustik
Fundament
Grundläggande vetenskaper
DOI
10.1016/j.combustflame.2023.113170