热力发电2024，Vol.53Issue(3)：137-145,9.DOI:10.19666/j.rlfd.202308134
基于反旋流的密封气流激振抑制方法及结构参数设计
Flow-induced vibration suppression method and structural parameter design of the seal with shunt injection
摘要
Abstract
Labyrinth seals are widely used in various types of turbomachinery due to their simple structure,convenient maintenance,and long service life.The shunt injection devices can reduce the flow-induced vibration caused by the spiral effect and improve the stability of the sealing system by affecting the circumferential flow inside the seal cavity.The three-dimensional numerical models of shunt injection labyrinth seal were established to calculate and analyze the impact of the shunt injection nozzle on the dynamic characteristics of the seal under different structural parameters.The results show that the smaller the tilt angle of the anti-swirl nozzle,the greater the system damping and stability.When the tilt angle is 30°,the effective damping is 4 times that of the vertical angle incident;the shape of the anti-swirl nozzle has a small impact on the sealing dynamic and flow characteristics.The cross stiffness of both nozzle hole types is negative,and the difference in cross stiffness between the two is about 5 kN/m at low frequencies and 1～2 kN/m at high frequencies;the more nozzles there are,the more they can suppress the circumferential flow of the rotor,which is beneficial for system stability.关键词
反旋流/梳齿密封/动力特性/计算流体力学Key words
shunt injection/labyrinth seal/dynamic characteristics/computational fluid dynamics引用本文复制引用
曹仲勋,申智勇,汪飞,董雪峰,张乃丹,张万福..基于反旋流的密封气流激振抑制方法及结构参数设计[J].热力发电,2024,53(3):137-145,9.基金项目
国家能源集团科学技术研究院有限公司科技项目(WH2023Y02) （WH2023Y02）
国家自然科学基金面上项目(51872361)Science and Technology Project of National Energy Group Science and Technology Research Institute(WH2023Y02) （51872361）
General Program of National Natural Science Foundation of China(51872361) （51872361）
