基于有限元方法的汽轮机组排汽缸静刚度分析  

Static Stiffness Analysis of Turbine Exhaust Cylinder Based on Finite Element Method

作　　者：王超军 Wang Chaojun(Steam Turbine Research Institute,Guangzhou Guangzhong Enterprise Group Co.,Ltd.,Guangzhou,511495,China)

机构地区：[1]广州广重企业集团有限公司汽轮机研究所,广州511495

出　　处：《机电工程技术》2024年第11期283-286,共4页Mechanical & Electrical Engineering Technology

摘　　要：鉴于汽轮机组排汽缸的刚度性能研究较少的现象,采用有限元计算与样机试验方法,对某型汽轮机组排汽缸的刚度特性进行了研究。采用CATIA三维软件建立排汽缸的力学模型,通过采用有限元的方法分别模拟计算排汽缸在受到160、360和760 kN竖直向下载荷时的变形情况,在160 kN工况时排汽缸轴承座联结位置的位移值约为3.69×10-2 mm,确定其静刚度为4.33×106 N/mm,满足机组安全运行的要求。加工出试验样机,通过液压装置在排汽口施加载荷,研究表明,在静力载荷作用下,排汽缸的位移变化主要集中在排汽口中部及后轴承座连接处,并随着载荷增加呈线性变化规律,越靠近排汽口部位变化越大;下缸后轴承座联接法兰竖直向位移是影响排汽缸静刚度的重要位置。有限元计算与试验结果基本一致,这说明在排汽缸研发过程中可以采用数值分析方法作为排汽缸设计和优化的重要手段,确保排汽缸安全可靠。Given the limited research on the stiffness performance of turbine exhaust cylinders,the stiffness characteristics of a turbine exhaust cylinder using finite element analysis and prototype testing is investigated.A mechanical model of the exhaust cylinder is established using CATIA 3D software,by employing the finite element method,the deformation of the exhaust cylinder is simulated and calculated under vertical loads of 160,360,and 760 kN.Under the 160 kN working condition,the displacement at the bearing seat connection of the exhaust cylinder is approximately 3.69×10-2 mm,and its static stiffness is determined to be 4.33×106 N/mm,which meets the safety operating requirements of the unit.A test prototype is manufactured,and loads are applied at the exhaust port using a hydraulic device.The study shows that under static load,the displacement change of the exhaust cylinder is primarily concentrated at the middle of the exhaust port and the connection point of the rear bearing seat,exhibiting a linear variation with increasing load.The displacement changes become more pronounced closer to the exhaust port.The vertical displacement of the flange connecting the rear bearing seat of the lower cylinder is a crucial factor affecting the static stiffness of the exhaust cylinder.The results of the finite element analysis are generally consistent with the experimental results,indicating that numerical analysis methods can be used as important tools for the design and optimization of exhaust cylinders during their development process,ensuring their safety and reliability.

关 键 词：汽轮机 排汽缸 有限元 静刚性 试验 

分 类 号：TK261[动力工程及工程热物理—动力机械及工程]