A three-dimensional numerical simulation of the temperature field in high temperature combustion furnace is performed using a method of discrete ordinate to solve the radiation transfer and transfer coupled equations.A computer program of flow, combustion, heat transfer and NOx turbulent formation is developed. The temperature distribution of Fuel Direct Injection (FDI) is numerically analyzed at different preheated air temperature and the validity of the applied numerical simulation is tested. The simulation results show that when preheated air temperature increases the maximum temperature gets larger, the temperature gradient becomes lower and the flame length longer.They are in agreement with experiments.

The three-dimensional numerical simulation of the non-premixed combustion turbulent mixing processing in high temperature combustion furnace have been performed with authors developed computer program of flow,combustion,heat transfer and NO-x turbulent formation.The 3d-distributions of mixture fraction and its turbulent fluctuation are forecasteed under three different inlet air temperature conditions in combustion furnace.Compared with non-premixed combustion,the results demonstrate that,under certain geometry and dynamical conditions,the turbulent mixing of high temperature air combustion proceeds with smaller intensity within a larger zone; the turbulent mixture fluctuation distributes within the larger combustion zone.This also indicates that the flame thickness appears to be larger and that heat is released within larger combustion zone.The simulating conclusions are in agreement with the results of similar experiments.

The three-dimensional distribution of the velocity value of isothermal flow in high temperature air combustion furnace was numerically simulated with a computer program. Three types of isothermal flow configuration were forecasted under the conditions of three different velocity ratios of fuel to air inject. The flow field properties of the interaction among multi-injections and the recirculating flow were analyzed. It was shown that under certain geometrical parameters, the lower oxygen concentration in recirculating flow can be obtained in the furnace by selecting proper velocity ratio of fuel to air jet in same scalar level. The simulating conclusions are in agreement with the experimental results.

Three dimensional velocity distribution of isothermal flow field in high temperature air combustion furnace was numerically simulated under different fuel injection conditions. The corresponding 3D isothermal flow field was predicted by varing the distance between the fuel burner, the nozzle number of the air regenerating burners, the fuel injecting direction and fuel burner distribution around circle direction on the top surface of the furnace. The simulation results can be used to expose the optimum distance between the fuel gas nozzle and air nozzle, the optimum velocity distribution profiles by reversed injection and multi burners symmetrically distributions, and the lower oxygen distribution so that to effectively settle the know how technology of high temperature air combustion(HiTAC). The similar tests prove that simulation results are consistant with the experiment data well.

The three-dimensional velocity distribution in a small scale high temperature air combustion furnace was numerically simulated with a developed CFD program. Three case for an isothermal flow configuration were predicted under the conditions of three different velocity ratios of fuel to air injection. The flow fields of isothermal calculations are compare to those of a combusting flow. It is shown that under the certain geometry parameters, the lower oxygen concentration in the recirculating flow and a lower uniform temperature level can be obtained in high temperature air combustion furnace by selecting the proper velocity ratio of the fuel to air jet. The predicted results are in agreement with the results of experimentation.