Lewis number and preferential diffusion effects in lean hydrogen–air highly turbulent flames
Unsteady three-dimensional direct numerical simulations of highly turbulent, complex-
chemistry, lean hydrogen-air flames were performed by changing the equivalence ratio ϕ,
root mean square velocity u′, and turbulence length scale L. For each set of ϕ, u′, L,
to explore the influence of molecular transport coefficients on the turbulent burning velocity
UT, four cases were designed:(i) mixture-averaged diffusivities;(ii) diffusivities equal to the
heat diffusivity κ of the mixture for all species;(iii) mixture-averaged diffusivities for all species …
chemistry, lean hydrogen-air flames were performed by changing the equivalence ratio ϕ,
root mean square velocity u′, and turbulence length scale L. For each set of ϕ, u′, L,
to explore the influence of molecular transport coefficients on the turbulent burning velocity
UT, four cases were designed:(i) mixture-averaged diffusivities;(ii) diffusivities equal to the
heat diffusivity κ of the mixture for all species;(iii) mixture-averaged diffusivities for all species …
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