Study on Combustion Characterization of Hydrogen Fuel Micro Mixing Burner
Taking the four-nozzle micro mixing burner with a center blunt body as the object,the com-bustor model was numerically simulated by using ANSYS FLUENT software and the flamelet-generated maniflod method under thermal state,which was combined with experimental studies to investigate the fundamental combustion characteristics of micro mixing burner of methane-hydrogen mixed fuels with vol-ume fraction of 40％CH4 and 60％H2,such as fuel-air mixing,flow field,temperature field,flame morphology and pollutant emission.The results show that the structure of the micro mixing burner with ra-dial air and fuel intake facilitates fuel-air mixing,and the doping uniformity index at the burner outlet reaches 0.959;there exists a small and obvious central reflux zone at the burner blunt body structure,which contributes to the flame stabilization;in the range of equivalence ratio from 0.4 to 0.8,the flame roots stably adhere to the outlet of micro mixing nozzle,which are independent of each other,and the burner flame morphology photos in the experiment are basically consistent with the simulated OH*field distribution;in the range of adiabatic flame temperature from 1 500 to 2 050 K,the NOx emissions at the model combustion chamber outlet are all lower than 16 × 10-6,and the CO emissions are all lower than 11 x10-6,which indicates that the micro mixing burner has a low pollutant emission level and a very high combustion efficiency.
gas turbinehydrogen fuellow-pollution combustionmicro mixing burnercenter blunt body structure
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