What is being addressed as flamelets
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Flamelet approach is applied for combustion modelling. Global one-step mechanism of methane is adopted. The temperature and species are computed in the mixture fraction space [15]. And the density of the mixture p(Z) can be calculated using the ideal gas relationship
ρ(z)=
P
R0T(Z)∑
Yi(Z)
Wi
where Ro is the universal gas constant and P is the pressure.
To determine the mean density of the hot flow, A presumed probability density function (PDF)
˜
p
(Z,x,t) is adopted and a standard β-function has been chosen
(13)
˜
P
(Z,x,t)=
Za−1(1−Z)β−1
∫
1
0
Zα−1(1−Z)β−1dz
(14)α=
˜
Z
(
˜
Z
(1−
˜
Z
)
˜
z″2
−1);β=(1−
˜
Z
)(
˜
Z
(1−
˜
Z
)
˜
z″2
−1
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