摘要
为了探究中心分级燃烧室各级旋流器叶片数量与相应旋流气量变化对燃烧室性能的影响,基于高推重比和高温升的技术需求,对设计模型进行了除旋流器外分块结构化网格划分,并在ICEM软件中实现混合网格周期性边界条件设置,进行3维数值模拟。结果表明:确定最优方案的3级旋流器叶片数量分别为8、10和15。中心分级燃烧室每级旋流器流通气量随其相应旋流器叶片数量改变呈负相关变化关系;设计油气比为0.045时,中心分级燃烧室最优方案即基准型方案的温升可达1300 K,出口温度分布系数OTDF达到0.13,在性能所要求的0.10~0.15之间,出口径向温度分布系数RTDF达到0.081,在性能所要求的0.08~0.12之间;中心分级燃烧室出口截面OTDF值随火焰筒头部每级旋流器的叶片数量或旋流气量的变化关系是“V”形,RTDF值随头部每级旋流器的叶片数量或旋流气量的变化关系是类“V”形。
To investigate the effects of the number of swirler vanes and corresponding swirling air flow variation on the performance of a concentric staged combustor,in response to the increasing technical requirements of high thrust-to-weight ratio and high temperature rise,all computational domains of the design model were partitioned in the form of multi-block structured grid except for the computational domain of the swirler,periodic boundary conditions of the mixed grid were set in ICEM software,and three-dimensional numerical simula⁃tions were conducted.The results show that the optimum number of vanes of the three-stage swirler is 8,10,and 15,respectively.The amount of air flowing through each stage of the swirler in the concentric staged combustor is negatively correlated with the number of swirler vanes.When the design fuel-air ratio is 0.045,for the optimal scheme of the concentric staged combustor,i.e.the reference scheme,the temperature rise can reach 1300K;the OTDF(overall temperature distribution factor)can reach 0.130,which falls within the range of 0.10 to 0.15 as required by performance specifications;the RTDF(radial temperature distribution factor)can reach 0.081,meeting the performance requirement range of 0.08 to 0.12.The relationships between the OTDF values of the outlet section of the concentric staged combustor and the number of vanes or the amount of swirling air in each stage of the swirler at the head of the flame tube are all V-shaped,and the relationships between the RTDF values and the number of vanes or the amount of swirling air in each stage of the swirler at the head of the flame tube are similar to a V-shape.
作者
王多
李锋
赵凯
WANG Duo;LI Feng;ZHAO Kai(School of Energy and Power Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100191,China;School of Aviation Operations and Services,Aviation University of Air Force,Changchun 130022,China)
出处
《航空发动机》
北大核心
2024年第2期65-76,共12页
Aeroengine
关键词
超高温升燃烧室
中心分级燃烧室
旋流器
燃烧性能
叶片数量
旋流气量
出口温度分布
ultra-high temperature rise combustor
concentric staged combustor
number of vanes
amount of swirling air
outlet temperature distribution
