直榫槽和斜榫槽两种出口结构预旋系统流动特性数值研究
Numerical investigation of flow characteristics of a pre-swirl system with two outlet structures:straight and oblique mortise groove
朱晓华 1古冬 1郭文 1刘松1
作者信息
- 1. 中国航发四川燃气涡轮研究院,成都 610500
- 折叠
摘要
采用三维数值计算方法对发动机直榫槽、斜榫槽两种出口结构的预旋系统开展模拟,研究改变预旋系统出口几何结构对叶片供气通道气体流动及压力损失的影响,并与一维工程计算方法对比.结果表明:榫槽结构由直榫槽改成斜榫槽对叶片供气通道压力损失影响较小,两种结构预旋系统进出口流量差异较小,系统出口各腔流量分配略有差异;数值计算与工程计算结果在系统进口、出口无量纲流量差别较小,上封严出口、下封严出口无量纲流量差别较大,相对偏差接近50%,封严区域流动换热复杂,需要进行三维仿真计算,以提高设计精度.
Abstract
Three-dimensional numerical calculation methods were used to simulate the pre-swirling system with two different outlet structures:straight and oblique mortise groove,for a certain aero-engine,the effect of changing the outlet geometric structure of the pre-swirling system on the gas flow characteristics and pressure loss of the blade air supply channel was studied.Results were compared with one-dimensional engineering calculation methods,outcome shows show that changing the straight mortise groove structure to an oblique one has little effect on the pressure loss of the blade air supply channel.The inlet and outlet flow rates of the pre-swirl systems of the two structures are slightly different,and there are slight differences in the flow distribution of each cavity at the outlet of the system.The dimensionless flow rates at the inlet and the outlet of the system calculated numerically are slightly different from those calculated by engineering methods,while the non-dimensional flow rates at the outlet of the upper and lower seals are significantly different,with a relative deviation of nearly 50%,the flow and heat transfer in the regions of the upper and lower seals are complex,requiring the use of three-dimensional numerical simulation calculations to enhance design accuracy.
关键词
航空发动机/预旋供气系统/榫槽结构/压降/无量纲流量/数值模拟/工程计算方法Key words
aero-engine/pre-swirl system/mortise groove structure/pressure drop/dimensionless flow rate/numerical simulation/engineering methods引用本文复制引用
出版年
2024
NETL
NSTL
万方数据