Modelling of non-premixed turbulent combustion with Conditional Moment Closure (CMC)

Conditional Moment Closure (CMC), an advanced turbulent reacting flow method, has been applied to the challenging cases with a varying degree of turbulence-chemistry interactions. The CMC approach may be used either in the RAMS or LES context, this is reviewed in the first part of this paper, while the second part is dedicated to applications on Sandia piloted jet flames D and F and lifted hydrogen jet flame. In case of the Sandia piloted jet flame D, the RANS-CMC simulation results are in agreement with the experimental data. On the other hand, when one comes to the results for the Sandia flame F, extinction is not captured. These discrepancies are attributed to the use of RANS in combination with the boundary conditions set in CMC. However, in case of turbulent lifted jet flame in vitiated co-flow, the LES-CMC model is able to capture the axial and radial profiles of mixture fraction, temperature and major species. The lift-off height is found to be very sensitive to the co-flow temperature as well as the co-flow velocity. The LES-CMC results highlight the potential of the technique to simulate the problems which involve complex turbulence-chemistry interactions.