To realize adjusting the fire intensity of cooking robot continuously,a numerical calculation and experiments of dual-pressure fire system for blast gas combustor were carried out.Firstly,the basic equations of fluid mechanics,the equations of component transport and the equations of turbulence for the induction tunnel of combustor were established.Secondly,the CFD software FLUENT was utilized to build the two dimensional axisymmetry gas-kinetic model for the induction tunnel,to define the boundary condition,the initial state and the finite-rate chemical reaction model.Thirdly,the control method of dual-pressure fire intensity was obtained.According to the variation curve of pressure value of high-pressure air in the nozzle central axle with the accelerating value of combustible gas and quantity of air imbibed by ejection,the optimal matched pressure value of high-pressure air based on the specific heat load of combustible gas was obtained.The method was used on the cooking robot,which showed that the fire intensity feedback control could be achieved precisely and the power of common pressure(2.0 kPa) combustible gas combustor could be up to 18 kW.