Numerical Study on the Influence of Swirl Blade Installation Angle on the Performance of a Low Emission Combustor
To investigate the influence of the premixer stage structure of the swirler on the performance of the combustor,a numerical simulation method was applied to analyze the effects of the blade installation angle of the second premixer stage on the cold flow field,mixing characteristics and combustion perform-ance of a can annular model combustor.The results show that second-stage blade installation angle has a significant influence on the size of the recirculation zone,the fuel/air mixing characteristics and the com-bustion performance.As the second-stage blade installation angle increases,the swirling intensity in-creases,the radial width of the recirculation zone widens,and the total pressure loss increases.The fuel distribution at the swirler outlet and in the combustor liner becomes more uniform,resulting in a lower reac-ting field temperature,lower NOx production,and extremely low CO production that is insensitive to chan-ges in the second-stage blade installation angle.Within the scope of the study,the combustor performs op-timally when the installation angle of the second-stage blade is set at 50°,with a total pressure loss in the reacting field of 3.17％,a combustion efficiency of 99.99％,and a NOx production of 4.26 × 10-6.
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