Author(s): Zhou Jianxu; Cai Fulin; Wang Yuan
Linked Author(s): Fulin Cai
Keywords: Hydraulic vibration; Hydraulic resonance; Case analysis; Air chamber
Abstract: Hydraulic vibration is a common and dangerous phenomenon occurring in pressurized conveyance system. While the disturbance frequency is close to natural frequency of pressurized conveyance system, or hydraulic system itself is under an unstable condition, there will be strong hydraulic vibration which is called hydraulic resonance. Some evident hydraulic vibration and related local destruction were observed in a hydropower plant. With the establishment of mathematical model of hydraulic vibration in its pressurized conveyance system and analysis of its corresponding characteristics of hydraulic vibration, the result of case analysis indicates that the local destruction in the hydropower plant results from violent pressured oscillation caused by hydraulic resonance. Therefore, it is necessary to adopt some effective methods to avoid the possible hydraulic vibration. Based on the establishment of equivalent electrical models of pressurized system and theoretical analysis of the relevant adoptive damping methods to mitigate hydraulic vibration, the corresponding effect of vibration reduction by means of air chamber is analyzed due to the rapid development of its application in recent years. The results indicate that air chamber is superior to throttled surge tank in terms of vibration reduction.
Year: 2007