基于燃气轮机运行条件的氨/氢混合燃料动力学模型优化OA

The classic Xiao kinetic mechanism suffers from insufficient prediction accuracy and excessive computational cost when conducting numerical simulations of micro gas turbine combustors fueled with ammonia/hydrogen blends.To address these drawbacks,this paper simplifies and optimizes the original Xiao mechanism by combining numerical simulation with sensitivity analysis,and develops a reduced kinetic model M-3 capable of accurately calculating the combustion characteristics of ammonia/hydrogen mixtures.The reliability of the M-3 model for numerical simulation of practical gas turbine combustors is verified via micro gas turbine tests.The results demonstrate that the M-3 model achieves substantially improved calculation accuracy compared with the Xiao mechanism.Its calculation errors of laminar burning velocity and ignition delay time are 9.38%and 25.91%,representing accuracy improvements of 61.63%and 65.19%relative to the Xiao mechanism,respectively.Although the ignition delay prediction error of the M-3 model is 6%higher than those of the Zhang and Glarborg mechanisms,the overall size of the model is reduced by approximately one-third,which greatly shortens the computation time of numerical simulations.Furthermore,the influence of hydrogen blending ratio on combustion characteristics is investigated.Numerical results of the gas turbine combustor indicate that the temperature and NOX distributions predicted by the M-3 model agree well with practical expectations.In contrast,the Xiao mechanism underestimates the combustor temperature and overestimates NOX emission concentrations.The proposed M-3 model can provide robust kinetic support for the research and application of ammonia/hydrogen blends in gas turbines.