Development of a partially-premixed coherent flame model (PCFM) for turbulent combustion

摘要

Partially-premixed combustion occurs in many combustion devices of practical interest, such as internal combustion engines and gas-turbine combustors. In this paper we propose modifications to coherent flame model (CFM) so that it can be brought to the simulation of partially-premixed combustion. For the primary premixed flame, a transport equation for flame area density is solved in which the wrinkling effects of the flame stretch and flame annihilation are considered. For the subsequent non-premixed zone, a laminar flamelet PPDF methodology which accounts for the non-equilibrium and finite-rate chemistry effects is adopted. The model is validated against the experimental data on a premixed flame with a bluff-body stabilizer. These show good agreements. Then using a partially-premixed case the capabilities of PCFM are further illustrated.