Effects of the pilot equivalence ratio on combustion characteristics of internally-staged model combustor
In this paper,a numerical simulation method is used to study the internally-staged model combustor,and the influence of the change of the pilot equivalence ratio on the fuel mixing and combustion characteristics in the model combustor is investigated,obtaining the variation law of velocity,temperature,and composition distribution of intermediate products in the combustor.The emphasis is put on the analysis of the variation law of combustor performance and emission parameters under different pilot equivalence ratios.The results show that with the increase of the pilot equivalence ratio,the mixing effect of fuel and air at the head of the combustor deteriorates,and the equivalence ratio of fuel at the swirler outlet increases significantly.As the pilot equivalence ratio increases,the area of high temperature zones and peak temperature increase,and NOx emissions significantly increase.When the pilot equivalence ratio increases from 0 to 1,the NOx emission at the combustor outlet increases nearly six times,and the NOx emission presents an exponential increase.The change in the pilot equivalence ratio has little impact on combustion efficiency,pressure loss,and CO emissions.Under different pilot equivalence ratios,the combustion efficiency is above 99.94%,the pressure loss is 2%,and the CO emission at the combustor outlet is 8×10-6.
marine gas turbineinternally-stagedcombustion chamberpilot stageNOx emissionCO emissionnumerical simulationpartial premixed combustion
万方数据
维普
