Influence of Lomakin Effects on the Dynamic Coefficients of Liquid Plain Seals

• Main Authors: Chia-Wei Hsu, 許家瑋
• Other Authors: 楊大中
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/37233993104037865703

碩士 === 元智大學 === 機械工程學系 === 98 === In fluid rotating machinery, dynamics of rotors is affected by Lomakin effects, which are the radially restoring forces caused by the difference of the pressure drops between the opposite sides of the rotor when the fluid flows through seals. The dynamic characteristics of seals can affect the stability of the rotor systems. Rotor Stability is always an important research issue in rotordynamics. In previous research, the influence of Lomakin effects on the dynamics coefficients of seals were not investigated inclusively. Influence of factors on the Lomakin effect are specially studied in this paper. The factors on Lomakin effects include ratio of seal length and shaft diameter, ratio of seal clearance to shaft radius, surface roughness, eccentricity of the rotor, inlet loss coefficients, inlet preswirl, and fluid properties, such as viscosity and variety. In this paper, the influence of factors on the Lomakin effects and the dynamic coefficients are examined by Fluent, a CFD software.