摘要
在建立倾斜齿迷宫密封三维数值模型的基础上,应用密封动力特性识别模型和数值计算方法,研究了倾斜齿迷宫密封动力特性和减振机理。结果表明:相比于直齿迷宫密封(Straightteeth labyrinth seal, STLBS),前倾齿迷宫密封(Forward inclined-tooth labyrinth seal, FILBS)泄漏量明显偏低,而后倾齿迷宫密封(Backward inclined-tooth labyrinth seal, BILBS)泄漏量明显偏高;3种迷宫密封动力特性系数关系为:FILBS>STLBS>BILBS,且BILBS动力特性系数对后倾角变化更敏感。随前倾角增大,存在最佳倾角范围(45°~60°)使得密封有效刚度几乎保持不变,有效阻尼最高;与STLBS相比,FILBS可增大转子表面负的切向力绝对值,使密封动力稳定性提升,而BILBS易导致密封稳定性下降。
On the basis of the establishment of the three-dimensional numerical model of labyrinth seals with inclined teeth, its dynamic characteristics and vibration attenuation mechanism were investigated by applying the seal dynamic characteristics identification model and numerical calculation method.The result shows that compared with the straight-teeth labyrinth seal(STLBS), the forward inclined-teeth seal(FILBS) has lower leakage flow rate of labyrinth seals, while backward inclined-teeth seal(BILBS) has higher leakage flow rate of the seal obviously.The relationships of dynamic characteristic coefficients of three types of labyrinth seals are: FILBS>STLBS>BILBS, and the coefficient of BILBS is more sensitive to the changes of backward inclination angle.As the forward inclination angle increases, there is an optimal inclination angle range of 45° to 60° that makes the effective stiffness keep almost unchanged and the effective damping be the highest for the FILBS.Compared with STLBS, FILBS can increase the absolute value of the negative tangential force acting on the rotor surface, and then improve the dynamic stability of the system, while BILBS is easy to make the stability of the system decrease.
作者
顾承璟
张万福
潘渤
李春
GU Cheng-jing;ZHANG Wan-fu;PAN Bo;LI Chun(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai,China,200093;Xi'an Thermal Power Research Institute Co.,Ltd.,Xizan,China,710054)
出处
《热能动力工程》
CAS
CSCD
北大核心
2022年第5期23-30,37,共9页
Journal of Engineering for Thermal Energy and Power
基金
国家自然科学基金(51875361)
上海市自然科学基金(20ZR1439200)。
关键词
迷宫密封
计算流体力学
倾斜齿
动力特性
稳定性
labyrinth seals
computational fluid dynamics(CFD)
inclined-teeth
dynamic characteristics
stability
