旋流数对贫预混燃烧特性影响  

Effect of swirl number on lean premixed combustion characteristics

作　　者：徐丽[1] 刘凯 曾文 XU Li;LIU Kai;ZENG Wen(School of Mechanical Engineering,Shenyang Ligong University,Shenyang 110134,China;School of Aero-engine,Shenyang Aerospace University,Shenyang 110136,China)

机构地区：[1]沈阳理工大学机械工程学院,沈阳110134 [2]沈阳航空航天大学航空发动机学院,沈阳110136

出　　处：《航空动力学报》2023年第6期1292-1298,共7页Journal of Aerospace Power

基　　金：国家自然科学基金(51376133);航空科学基金(2015ZB54003)。

摘　　要：采用数值模拟与试验的手段,研究了旋流数对贫预混燃烧室燃烧性能的影响。数值模拟结果表明:旋流数在0.56~0.73之间,火焰筒头部均能产生明显的回流区,随旋流数的增加,回流区增大,但燃料掺混均匀性变差,主燃区燃料不均匀度由0.00853增加到0.01047,不利于温度场均匀性的提升和氮氧化物(NOx)排放的降低。试验结果表明:随旋流数增加,贫油熄火燃空比减小,且随进口马赫数越小这种趋势越明显;随旋流数增加,燃烧室出口温度均匀性变差,温度分布系数由0.1640增加到0.1915,一氧化碳(CO)排放指数由26.23 g/kg减少到18.07 g/kg,未燃碳氢化合物(UHC)排放指数由12.55 g/kg减少到9.21 g/kg,而NOx排放指数由0.609 g/kg增大到0.850 g/kg。The effects of swirl numbers on the combustion performance of lean premixed combustor were studied by means of numerical simulation and experiment.The numerical simulation results showed that when the swirl number was between 0.56−0.73,an obvious recirculation zone can be generated at the head of the flame barrel.With the increase of swirl number,the scale of recirculation zone increased,but the fuel mixing uniformity became worse,and the non-uniformity of the main combustion zone decreased from 0.00853 to 0.01047,which was not conducive to the improvement of the uniformity of temperature field and the reduction of NOx emission.The experiment results showed that with the increase of swirl number,the lean blowout fuel-air ratio decreased,the smaller inlet Mach number indicated the more obvious trend,the outlet temperature distribution factor increased from 0.1640 to 0.1915,the uniformity became worse,the emission index of CO decreased from 26.23 g/kg to 18.07 g/kg,the emission index of UHC decreased from 12.55 g/kg to 9.21 g/kg,and the emission index of NOx increased from 0.609 g/kg to 0.850 g/kg.

关 键 词：贫预混燃烧 旋流数 贫油熄火 出口温度 排放指数 

分 类 号：V231.2[航空宇航科学与技术—航空宇航推进理论与工程]