Basically reactingFoam 2.3.x, but with a low Mach number assumption
Add thermodynamic pressure level in constant/chemistryProperties
pReff pReff [1 -1 -2 0 0 0 0] 1.01325E+05;
Further, you will need a new field-file: pd (dynamic pressure), which is actually your solved pressure variable (p is more or less a dummy field)
Duwig, Christophe, et al. "Large Eddy Simulations of a piloted lean premix jet flame using finite-rate chemistry." Combustion Theory and Modelling 15.4 (2011): 537-568.