عنوان مقاله [English]
نویسندگان [English]چکیده [English]
This paper is aimed to simulate a jet-stabilized combustor three dimensionally and also investigate the influence of the injection direction of the jet on the combustion characteristics and NOX emissions. A Finite Volume method is adopted to discretize the transport equations. The advection terms of all the transport equations are discretized by power law scheme. An Euler/Lagrangian approach is employed to take into account the gas-liquid interactions and model the spray combustion. Due to fluctuating characteristics of the flow, the presumed Probability Density Function (PDF) method is employed to investigate the chemistry-turbulence interactions. In order to estimate the turbulent behavior of the flow, realizable k-epsilon model is chosen and the discrete ordinates model is applied for predicting radiation heat trasfer. The present model of the jet-stabilized combustor is in a good agreement with the measurements. The results have shown that the injection towards upstream enlarges the recirculation zone and the maximum combustion temperature. Also, the higher combustion temperature at the recirculation zone leads to an increase in the NOX formation. Furthermore, injecting the air jet more towards downstream, yields a more uniform temperature at the combustor exhaust and less NOX formation.