低压涡轮在工作剖面内的多学科耦合仿真
Multidisciplinary Coupling Simulation of Low Pressure Turbine in Working Profile
张云达 1邹正平 1姚李超1
作者信息
- 1. 北京航空航天大学能源与动力工程学院,航空发动机气动热力国家级重点实验室,北京 100191;北京航空航天大学航空发动机研究院,北京 102206
- 折叠
摘要
在涡轮的典型工作剖面内,采用计算流体力学和两种多学科耦合求解方式对某二级低压涡轮部件进行仿真,比较不同求解方式所预测的涡轮气动热力参数之间的差异,分析工作剖面内局部几何的形变规律以及局部形变对流场的影响,结果表明:多学科耦合作用对低叶高位置叶型负荷分布产生一定的影响,具体影响规律与不同工况密切相关.考虑固体域热传导和形变的多学科耦合求解方式所预测的效率值更高.随着涡轮功率的提升,级间轮缘间歇和封严篦齿间隙的改变会导致更多封严冷气聚集在前腔中,影响盘腔内的流动结构,削弱了燃气入侵现象,实现盘腔内更好的冷却和封严效果.
Abstract
Simulation of a two stages low-pressure turbine component using computational fluid dynamics and two multidisciplinary coupled solutions within a typical operating profile of the turbine.Comparison of differences between turbine aerodynamic thermodynamic parameters predicted by different solution methods.Analysis of the deformation rules of the local geometry and the effect of local deformation on the flow field within the working profile.The results show:Multidisciplinary coupling effect on the low blade position load distribution to produce a certain impact,the specific influence law and different working conditions are closely related.The multidisciplinary coupled solution approach that considers heat transfer and deformation in the solid domain predicts higher values of turbine efficiency.As the turbine power increases,changes in the interstage flange intervals and sealing grate tooth clearances result in more sealing cold gas collecting in the front chamber,affecting the flow structure in the disc chamber,weakening the gas intrusion phenomenon,and achieving better cooling and sealing effects in the disc chamber.
关键词
多学科耦合/低压涡轮/工作剖面Key words
multidisciplinary coupling/low-pressure turbine/working profile引用本文复制引用
基金项目
国家科技重大专项(J2019-Ⅱ-0012-0032)
出版年
2024
NETL
NSTL
万方数据