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17.2 Theory

The partially premixed model solves a transport equation for the mean reaction progress variable, $\overline{c}$ (to determine the position of the flame front), as well as the mean mixture fraction, $\overline{f}$ and the mixture fraction variance, $\overline{f^{'2}}$. Ahead of the flame ( $c=0$), the fuel and oxidizer are mixed but unburnt, and behind the flame ( $c=1$), the mixture is burnt.




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