摘要
为解决某燃气轮机试验过程中频繁出现的转子轴向力调整困难问题,基于转-静盘腔气动轴向力的直接动态测试方法,开展对比试验,系统研究了轮缘密封半径、轴端密封结构及卸荷孔对转-静盘腔气动轴向力的影响规律。试验结果表明:当轴端迷宫密封半径从22 mm增大到42 mm,可使轮盘轴向力降低约74.1%;相比于直梳齿,当轴端迷宫密封齿具有5°的倾角时,轴向力降低约71.1%;当轴端迷宫密封的间隙比从1.14%增加到1.82%时,轴向力降低约87.7%;周向布置卸荷孔同样可使气动轴向力降低约50.3%。研究结果证明:当燃气轮机转子轴向力失衡时,可通过调整迷宫密封半径、倾角、间隙比和增加卸荷孔等方式实现转子轴向力的有效调整。
In order to solve the problem of difficult adjustment of rotor axial force occured frequently in a gas turbine test process,based on a direct dynamic test method for aerodynamic axial force of rotor-stator cavity,the influence law of rim seal radius,shaft end seal structure and unloading hole on the aerodynamic axial force of rotor-stator cavity was studied systematically by comparative experiments.The experimental results show that the axial force of the wheel disc decreases by about 74.1%when the radius of the shaft end labyrinth seal increases from 22 mm to 42 mm.Compared with the straight comb tooth,when the shaft end labyrinth seal tooth has a 5°inclination angle,the axial force is reduced by about 71.1%.When the clearance ratio of the shaft end labyrinth seal increases from 1.14% to 1.82%,the axial force decreases by about 87.7%.In addition,the circumferential arrangement of unloading holes can also reduce the aerodynamic axial force by about 50.3%.The research results demonstrate when the axial force of the gas turbine rotor is unbalanced,the axial force of the rotor can be adjusted effectively by adjusting the labyrinth seal radius,inclination angle,clearance ratio and increasing the unloading holes.
作者
杜向宇
贾兴运
DU Xiangyu;JIA Xingyun(College of Electrical and Mechanical Engineering,Beijing University of Chemical Technology,Beijing,China,Post Code:100029)
出处
《热能动力工程》
北大核心
2025年第6期126-132,共7页
Journal of Engineering for Thermal Energy and Power
基金
国家自然科学基金(52305176)
黑龙江省自然科学基金联合引导项目(JJ2020LH1197)
中央高校基本科研经费(JD2423)。
关键词
燃气轮机
转子轴向力失衡
转-静盘腔
迷宫密封
卸荷孔
gas turbine
rotor axial force imbalance
rotor-stator cavity
labyrinth seal
unloading hole
