According to different gas compositions in combustor at different temperatures

two calculation methods for predicting gas temperature by establishing different gas models were proposed. Based on the theory of substance conservation

chemical equilibrium and energy conservation

the equations of temperature calculation were established. According to different expressions of the energy conservation equation

the average specific heat capacity of constant pressure method and the enthalpy value method were given

two mathematical methods for solving nonlinear equations were presented at the same time

including three variables iterative method and Newton method. VB (Visual Basic) was used to compile test program to realize temperature algorithm. The calculation example was enumerated to compare the difference between the two algorithms. The result shows that the difference of gas temperatures obtained by the two methods is greater with the increase of oil gas ratio

the result acquired by the high temperature algorithm considering thermal dissociation is smaller

and the reason is that the molar fraction of the dissociated components in the gas increases with the temperature rise

and the actual heat release decreases

leading to the decrease in gas temperature. Therefore when the gas temperature is higher

the high temperature algorithm is more in line with the actual combustion situation.