以某型核电汽轮机为研究对象，利用ANSYS软件，针对车削部分下缸法兰结合面和轴封弯角平面过渡两种变形控制方案计算了高中压缸结合面的变形，并针对加粗顶部撑杆以及加厚排汽锥体内侧竖板和斜板两个变形控制方案对低压缸轴封变形进行了数值分析。结果表明：增加结合面刚度能有效控制轴封附近结合面变形，使得轴封附近最大应力从268.75 MPa下降到159.51 MPa，并将处在滑移分离区域的螺栓从5颗减少到1颗，提高了高中压缸的汽密性；增加轴封部位缸体的刚度能有效控制轴封的变形，改善轴封部件的倾斜程度，使轴封的倾斜角相对减小了55.02%，轴封外侧底部的上抬量减小0.097 6 mm,对低压缸碰磨起到有效改善作用。

Taking a certain nuclear power turbine as the research object,the ANSYS software was used to simulate and calculate the high and intermediate pressure cylinder joint surface deformation in the two deformation control schemes of turning part of the lower cylinder flange joint surface and the shaft seal corner plane transition.The low pressure cylinder shaft seal deformation was also numerically analyzed in the two deformation control schemes of thickening the top brace and thickening the vertical plate and the inclined plate on the inner side of the exhaust steam cone.The result shows that increasing the stiffness of the joint surface can effectively control the deformation of the joint surface near the shaft seal,which reduces the maximum stress near the shaft seal from 268.75 MPa to 159.51 MPa,reduces the number of bolts in the slip separation area from 5 to 1,and improves the steam tightness of the high and intermediate pressure cylinders.Increasing the stiffness of the cylinder block on the shaft seal can effectively control the deformation of the shaft seal and improve the inclination degree of the shaft seal components,so that the inclination angle of the shaft seal is relatively reduced by 55.02%,and the lifting amount of the bottom outside the seal is reduced by 0.097 6 mm,which effectively improves the rubbing of the low pressure cylinder.

TK263.1

国家自然科学基金（51776142）