预燃级对TeLESS Ⅱ燃烧室冒烟排放的影响

对不同预燃级结构的TeLESS Ⅱ燃烧室冒烟排放性能进行了研究。通过燃气分析试验方法分别考察了预膜空气雾化喷嘴和离心喷射空气雾化喷嘴在预燃级单独工作和主预燃级同时工作时的冒烟排放。结果表明在预燃级单独工作时,预燃级结构对冒烟排放性能影响较大,而在主预燃级同时工作时影响较小。通过数值模拟对两种预燃级结构在预燃级单独工作时的冒烟排放差异进行了分析,发现预燃级结构改变了燃油在主燃区内的分布,两种方案在主燃区内生成的碳烟前驱物乙炔质量分数和分布位置存在明显差异,最终导致燃烧室出口冒烟排放不同。 

Effect of pilot strutures on smoke emissions in the TeLESS Ⅱ combustor

The effects of different pilot structures on smoke emissions of TeLESSⅡ combustor were investigated. Smoke emissions of prefilming airblast atomizer and airblast simplex atomizer were tested through gas analysis method under pilot fueled mode and pilot-main fueled mode. The results indicated that the pilot structures had a great influence on the smoke emissions under pilot fueled mode, but less influence under pilot-main fueled mode. Numerical simulation was adopted to analyze different smoke emission performances with two pilot structures under pilot fueled mode. The simulation results show that the different pilot structures change the distribution of fuel in the main combustion zone, leading to significant differences in the mass fraction and distribution position of smoke precursor acetylene and different smoke emissions of combustor outlet.