Combustion flows with different fuels as heptane and pyrolysis gas in a dual-fuel-combustor of gas turbine were simulated by a CFD(computational fluid dynamics) method.The RNG(renormalization group) k-ε turbulence model

single chemistry reaction system

infinite-rate reaction velocity

discrete phase modeling for liquid fuel

upwind discretization scheme and the SIMPLE algorithm were applied.Some performances of combustor such as: combustion efficiency

temperature uniformity at outlet

temperature distribution of walls

distribution of air mass flow and the first air excess coefficient

were also analyzed.Some results show that: 1) the distribution of mass flow rate is consistent with different fuels

2) there is a 1% higher combustion efficiency and lower temperature uniformity at outlet with pyrolysis gas than that of oil fuel

3) the average temperature at outlet with pyrolysis gas is 20～40K lower than that of oil fuel with the same chemical enthalpy injected in the combustor

and 4) the first air excess coefficient α of pyrolysis gas is higher than that of oil fuel.