针对某两级中心分级分区单头部燃烧室结构参数对头部下游流场结构的影响，采用数值模拟结合正交设计的方法研究了头部结构参数（一/二级旋流数、值班级套筒张角、隔离段高度比）的变化对燃烧室流动特性的影响规律和程度。结果表明：中心回流区最大宽度随着二级旋流数、隔离段高度比、一级旋流数、值班级套筒张角4个结构参数的增大而增大，并且影响程度依次降低；中心回流区长度随着一/二级旋流数的增大而增大，套筒张角和隔离段高度比则对中心回流区长度的影响程度较小；值班级和主燃级旋流器的旋流数偏大以及值班级套筒张角偏大都会导致台阶回流区消失

Aiming at a twostage centralstaged singledome combustor, in order to investigate the effects of its structural parameters on the downstream flow field structure of dome, numerical simulation combined with orthogonal design was used to obtain the influence law and influence degree of the changes of each structural parameter (pilot swirl number, main swirl number, the expansion angle of the pilot′s sleeve and lip height) on the flow characteristics of the combustor. The results show that the maximum width of the primary recirculation zone increases with the increase of the four structural parameters such as swirl number of main stage swirler, lip height, swirl number of pilot stage swirler and expansion angle of the pilot′s sleeve, and the influence degree decreases in turn; the length of the primary recirculation zone increases with the increase of pilot swirl number and main swirl number, and the expansion angle of the pilot′s sleeve and lip height have little effect on the length of the primary recirculation zone; the larger swirl number of pilot stage and main stage swirlers and the larger expansion angle of the pilot′s sleeve will lead to the disappearance of the lip recirculation zone.

V231.2

国家科技重大专项（2017-III-0006-0031)