燃烧室头部结构对燃料预混特性影响的研究  

Research on the Effect of Combustor Dome Structure on Fuel Premix Characteristics

作　　者：徐婉容 刘凯 XU Wanrong;LIU Kai(School of Aero-engine,Shenyang Aerospace University,Shenyang,China,110136)

机构地区：[1]沈阳航空航天大学航空发动机学院,辽宁沈阳110136

出　　处：《热能动力工程》2024年第10期86-93,共8页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金(51376133)。

摘　　要：采用Fluent软件对某贫燃预混燃烧室燃料与空气的掺混特性进行数值模拟,分析燃料喷口方向、喷口尺寸、旋流数对预混特性的影响。在不改变边界条件的情况下,针对燃烧室不同结构进行模拟计算。模拟结果表明:燃料射入方向对燃烧室流场有重要影响,逆向射流更有利于产生稳定的中心回流区,并且当喷嘴的喷口角度到达150°掺混均匀性最佳,均匀度值为0.987 2。随着喷口尺寸的增大,回流区面积先增大后减小,掺混均匀性逐渐降低,小尺寸喷嘴与中尺寸喷嘴的均匀性差距不大,但中尺寸喷嘴有更大的回流区,燃烧更加稳定。当旋流器旋流数在0.55~0.97区间,火焰筒头部均能产生较为稳定的回流区,随着旋流数的增大掺混均匀性逐渐提高,均匀度值由0.979 5增加至0.994 4;同时回流区面积逐渐减小并且有向前移动的趋势。当不同转角的喷嘴与旋流器组合时,180°喷嘴与0.97旋流数的旋流器组合掺混效果较好,掺混均匀性为0.991。The fuel-air premixing characteristics in lean premix combustion chamber were numerically simulated using Fluent software.The effects of the fuel nozzle direction,nozzle size,and swirl number on premix characteristics were analysed.Under the condition that the boundary conditions were not changed,the simulation calculation for different combustion chamber structures was carried out.The simulation re-sults show that the direction of fuel injection has an important influence on the combustor flow field,re-verse jets are more conducive to producing a stable center recirculation zone,and when the nozzle angle reaches 150°,the mixing uniformity achieves its highest value of 0.9872.As the nozzle size increases,the area of recirculation zone increases firstly and then decreases,the mixing uniformity decreases gradu-ally,and the uniformity difference between the small-size nozzle and the medium-size nozzle is not signifi-cant,but the medium-size nozzle has a bigger recirculation zone and more stable combustion.When the swirl number is in the range of 0.55 to 0.97,the head of the flame tube can produce stable recirculation zone,with the increase of the swirl number,the mixing uniformity is gradually improved from 0.9795 to 0.9944,while the area of recirculation zone is gradually reduced,and there is a tendency to move forward.When the nozzles with different rotational angles are combined with the swirler,the combination of 180°nozzle and 0.97 swirl number of swirler has a better mixing effect,and the mixing uniformity is 0.991.

关 键 词：贫预混燃烧 喷口方向 喷口尺寸 旋流数 掺混均匀度 

分 类 号：TK221[动力工程及工程热物理—动力机械及工程]