摘要
针对燃气轮机安全运行问题,为保证盘腔良好冷却效果以及轮盘强度可靠性,该文对盘腔流动换热以及轮盘热固耦合特性进行数值研究。建立三级轮盘盘腔分析模型,对比转速及流量对盘腔流动换热特性的影响。基于流动换热结果分析轮盘应力及变形特性。结果表明:当转速增大时,各腔室内压力损失降低,换热面努塞尔数(Nu)呈现下降趋势,最多降低约66.1%;而当流量增大时,各腔室内压力损失升高,部分换热面Nu呈现上升趋势,最多升高约198%。在多种载荷综合作用下,轮盘最大等效应力为996.06 MPa,最大径向变形为2.62 mm。结果可为保证燃气轮机轮盘安全性提供一定技术支撑及数据参考。
Aiming at the safe operation of gas turbine,to ensure the good cooling effect of disk cavity and the reliability of disk strength,the flow heat transfer of disk cavity and thermo-solid coupling characteristics of disk are numerically studied in this paper.An analytical model of three-stage disk cavity is established,and the effects of rotational speed and flow rate on the flow heat transfer characteristics of the disk cavity are studied and compared.The stress and deformation characteristics of disk are analyzed based on the flow heat transfer results.The results show that when the rotational speed increases,the pressure loss in each chamber decreases,and heat exchange surface Nu decreases by 66.1%at most.When the flow coefficient increases,the pressure loss in each chamber increases,and Nu of some heat exchange surfaces presents an upward trend,up to about 198%.The maximum radial deformation is 2.62 mm and the maximum equivalent stress of the disk is 996.06 MPa under the comprehensive action of various loads.The research results provide technical support and reference data for ensuring the safety of gas turbine disk.
作者
王培宇
张鑫磊
张荻
苏鹏飞
谢永慧
孔祥林
WANG Peiyu;ZHANG Xinlei;ZHANG Di;SU Pengfei;XIE Yonghui;KONG Xianglin(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi Province,China;Dongfang Turbine Co.,Ltd.of Dongfang Electric Corporation,Deyang 618000,Sichuan Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2024年第4期1460-1467,I0017,共9页
Proceedings of the CSEE
基金
国家科技重大专项(J2019-IV-0022-0090)。
关键词
燃气轮机
轮盘盘腔
流动换热
热固耦合
gas turbine
disk cavity
flow and heat exchange
thermal-solid coupling
