Comparison of Presumed PDF Models of Turbulent Flames

Figure 14

Dependencies of the normalized mean density 𝜌_𝑏 of burned gas (a), the normalized maximum heat release rate 𝜔 (b), and the square root 𝑠^𝐿1/2 of the normalized laminar flame speed (c) on the mean equivalence ratio 𝐹, calculated either invoking the beta-function (curves 1), the R-2𝛿 (curves 2), and 2𝛿 (curves 3) PDFs, or neglecting fluctuations in the mixture composition (curves 4). 𝐹_min=0.5 and 𝐹_max=1.9,𝑔_𝑓=0.4.

(a)

(b)

(c)