TY - JOUR
TI - Active-grid turbulence effect on the topology and the flame location of a lean premixed combustion
AU - Alhumairi Mohammed
AU - Ertunç Özgür
JN - Thermal Science
PY - 2018
VL - 22
IS - 6
SP - 2425
EP - 2438
PT - Article
AB - Lean premixed combustion under the influence of active-grid turbulence was  computationally investigated, and the results were compared with  experimental data. The experiments were carried out to generate a premixed  flame at a thermal load of 9 kW from a single jet flow combustor. Turbulent  combustion models, such as the coherent flame model (CFM) and turbulent  flame speed closure (TFC) model were implemented for the simulations  performed under different turbulent flow conditions, which were specified by  the Reynolds number based on Taylor’s microscale (Reλ), the dissipation rate  of turbulence (ε) and turbulent kinetic energy (k). This study shows that  the applied turbulent combustion models differently predict the flame  topology and location. However, similar to the experiments, simulations with  both models revealed that the flame moves toward the inlet when turbulence  becomes strong at the inlet, that is, when Reλ at the inlet increases. The  results indicated that the flame topology and location in the coherent flame  model were more sensitive to turbulence than those in the turbulent flame  speed closure model. The flame location behavior on the jet flow combustor  significantly changed with the increase of Reλ.