Study on the flow stability and dynamic characteristics of a water bearing

Liming Zhai, Seishiro Kitauchi, Kazuyoshi Miyagawa, Zhengwei Wang

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    The dynamic characteristics of the sliding bearing have great influences on the vibration and stability of the rotorbearing coupled system. This study focus on a water lubricated bearing which supports the vertical rotor in atest facility. This rotor system is designed with maximum rotational speed of 5000 rpm and used to study the influence of water bearing on the rotor dynamics. Based on the unsteady computational fluid dynamics, a 3D model for the water film in the bearing with 3 grooves was built. The pressure oscillation in the water film was discussed. The dynamic characteristics including damping, stiffness and added mass of the bearing were calculated considering both the rotational effect and squeeze effect. The influences of the rotating speed of the shaft and prewhirl speed at water film inlet on the dynamic performance were also investigated. The results show that the instability of the film force on the journal is induced by the high-frequency vortexes in the grooves on the pad. At each rotational speed, the film force on the journal first decreases and then increase as the frequency ratio, while it increases with the increase of the rotational speed at each frequency. The rotational speed has great effects on the dynamic characteristics of bearing. Increasing the rotational speed contributes to strengthen the stability of the rotor system. The prewhirl velocity at the inlet has little impact on the dynamic characteristics and stability of the bearing. This study demonstrates the mechanism of lubrication dynamic characteristics of the siding bearing and shows the bearing nonlinear characteristics with the rotational speed. Using the CFD method to solve the water flow field is effective to predict the dynamic characteristics and can provide boundary conditions for the rotor dynamic analysis in the future study.

    Original languageEnglish
    Title of host publicationIET Conference Publications
    PublisherInstitution of Engineering and Technology
    Volume2014
    EditionCP658
    DOIs
    Publication statusPublished - 2014
    Event6th International Symposium on Fluid Machinery and Fluid Engineering, ISFMFE 2014 - Wuhan, China
    Duration: 2014 Oct 222014 Oct 25

    Other

    Other6th International Symposium on Fluid Machinery and Fluid Engineering, ISFMFE 2014
    CountryChina
    CityWuhan
    Period14/10/2214/10/25

    Fingerprint

    Bearings (structural)
    Water
    Rotors
    Computational fluid dynamics
    Dynamic analysis
    Lubrication
    Flow fields
    Vortex flow
    Damping
    Stiffness
    Boundary conditions

    Keywords

    • CFD
    • Dynamic characteristics
    • Instability
    • Oscillation
    • Water lubricated bearing

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

    Cite this

    Zhai, L., Kitauchi, S., Miyagawa, K., & Wang, Z. (2014). Study on the flow stability and dynamic characteristics of a water bearing. In IET Conference Publications (CP658 ed., Vol. 2014). Institution of Engineering and Technology. https://doi.org/10.1049/cp.2014.1236

    Study on the flow stability and dynamic characteristics of a water bearing. / Zhai, Liming; Kitauchi, Seishiro; Miyagawa, Kazuyoshi; Wang, Zhengwei.

    IET Conference Publications. Vol. 2014 CP658. ed. Institution of Engineering and Technology, 2014.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Zhai, L, Kitauchi, S, Miyagawa, K & Wang, Z 2014, Study on the flow stability and dynamic characteristics of a water bearing. in IET Conference Publications. CP658 edn, vol. 2014, Institution of Engineering and Technology, 6th International Symposium on Fluid Machinery and Fluid Engineering, ISFMFE 2014, Wuhan, China, 14/10/22. https://doi.org/10.1049/cp.2014.1236
    Zhai L, Kitauchi S, Miyagawa K, Wang Z. Study on the flow stability and dynamic characteristics of a water bearing. In IET Conference Publications. CP658 ed. Vol. 2014. Institution of Engineering and Technology. 2014 https://doi.org/10.1049/cp.2014.1236
    Zhai, Liming ; Kitauchi, Seishiro ; Miyagawa, Kazuyoshi ; Wang, Zhengwei. / Study on the flow stability and dynamic characteristics of a water bearing. IET Conference Publications. Vol. 2014 CP658. ed. Institution of Engineering and Technology, 2014.
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    AB - The dynamic characteristics of the sliding bearing have great influences on the vibration and stability of the rotorbearing coupled system. This study focus on a water lubricated bearing which supports the vertical rotor in atest facility. This rotor system is designed with maximum rotational speed of 5000 rpm and used to study the influence of water bearing on the rotor dynamics. Based on the unsteady computational fluid dynamics, a 3D model for the water film in the bearing with 3 grooves was built. The pressure oscillation in the water film was discussed. The dynamic characteristics including damping, stiffness and added mass of the bearing were calculated considering both the rotational effect and squeeze effect. The influences of the rotating speed of the shaft and prewhirl speed at water film inlet on the dynamic performance were also investigated. The results show that the instability of the film force on the journal is induced by the high-frequency vortexes in the grooves on the pad. At each rotational speed, the film force on the journal first decreases and then increase as the frequency ratio, while it increases with the increase of the rotational speed at each frequency. The rotational speed has great effects on the dynamic characteristics of bearing. Increasing the rotational speed contributes to strengthen the stability of the rotor system. The prewhirl velocity at the inlet has little impact on the dynamic characteristics and stability of the bearing. This study demonstrates the mechanism of lubrication dynamic characteristics of the siding bearing and shows the bearing nonlinear characteristics with the rotational speed. Using the CFD method to solve the water flow field is effective to predict the dynamic characteristics and can provide boundary conditions for the rotor dynamic analysis in the future study.

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