一种基于热管理的热端部件轻量化研究

Study on heated components mass reduction based on thermal management

基于对航空发动机使用热管理的思路,采用单向流固耦合(fluid structure interaction,FSI)算法,在等冷气耗量条件下,对旋转轮盘内应力水平与其盘心开槽加热及轻量化的关联性进行了计算研究.在转速为10 000r/min,盘腔冷却空气进出口边界条件、盘内外缘加热热流密度均保持不变的条件下,借鉴双辐板盘的拓扑结构,在盘心开不同大小的加热槽,研究盘内等效应力水平随盘心加热槽结构变化的规律.结果表明:通过盘心开槽加热方式,可以得到盘内温度场的U型分布,盘内应力水平得以有效降低,说明了盘内应力水平与盘心开槽加热的方式和大小存在着较强的关联性,在保证航空发动机整体气动性能、涡轮盘性能和使用寿命的前提下,探索通过对涡轮盘的主动热管理,实现对热端部件的显著轻量化是值得预期的.

The relationship between stress level and disk mass reduction in a rotating disk with heat channel and warming-up in disk root at a fixed flux of cooling air was numerically studied,by using fluid structure interaction（FSI） method based on the thermal management for heated components.The regulation between stress level and disk mass reduction was studied under the boundary condition of disk space and the heat flux of different heat channel configurations＇ fixed condition.The rotating speed was also fixed at 10 000 r/min.Numerical results reveal that there exists a strong relevance between stress level and the construction of heat channel and heat flux.By heating the disk root,the U-temperature distribution can reduce the disk stress level.It means that the method of active thermal management can achieve the disk mass reduction,while guaranteeing the performance of aero-engine and working life.