Numerical Simulation on Combustion Flow Field in Combustor with Reformed Gas and Kerosene

In order to investigate the effects of gas/liquid fuel on combustor performance and sensible enthalpy of reformed gas on dual-fuel combustor design,numerical simulation of dual-fuel combustor was performed by Fluent software. A comparative analysis of combustion flow field in combustor with reformed gas and kerosene was carried out. The Realizable k-e turbulence model,PDF(Probability Density Function) combustion model,discrete phase model and SIMPLE(Semi Implicit Method for Pressure Linked Equations) algorithm were adopted. The simulation results show that the structure size of recirculation zone is almost the same when the combustor is fueled with gas and liquid fuel. When the inlet enthalpy values of the kerosene and reformed gas are same,the maximum back flow velocity in the reformed gas combustor is about 5 times of kerosene combustor, the temperature in reformed gas combustor lowers about 300 K, flame length becomes shorter,OTDF(Overall Temperature Distribution Factor) decreases by 7.5% and the combustor outlet radial temperature distribution is more uniform. The sensible enthalpy of reformed gas should be considered when kerosene is replaced by reformed gas. Otherwise,the maximum back flow velocity in reformed gas combustor will increase byabout 12%,the flame will become longer and OTDF will become larger.