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Investigation of the effect of cavitation and journal whirl on static and dynamic characteristics of journal bearing

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Abstract

The cavitation phenomenon in journal bearing and journal whirl are considered to evaluate the static and dynamic characteristics of journal bearing, to be more consistent with the actual operating conditions of journal bearing. With a 3D CFD method, the cavitation and journal whirl are simulated by adopting mesh deformation technique and mixture phase-change model. By comparing the results with those of the traditional Reynolds equation, we observe that first, the phenomena of cavitation and journal whirl are very consistent with the actual operating conditions of journal bearing. Moreover, for single-phase and two-phase flow models, the distribution features of oil film pressure are similar in convergent wedge zone while largely different in divergent part of the gap. The oil film pressure and vapor phase volume fraction notably vary on different whirl positions of the journal. We also observe that as whirl frequency increases, the oil film force gradually increases and the stability of journal bearing decreases rapidly before reaching a plateau. The efforts of this paper provide an efficient method to accurately evaluate the static and dynamic characteristics of journal bearing and offer a useful insight into the accurate analysis and design of journal bearing.

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Author information

Authors and Affiliations

  1. Liaoning Key Lab of Advanced Test Technology for Aerospace Propulsion System, Shenyang Aerospace University, Shenyang, 110136, China

    Dan Sun, Shengyuan Li & Yanting Ai

  2. Department of Aeronautics and Astronautics, Fudan University, Shanghai, 200433, China

    Chengwei Fei

  3. Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong, 999077, China

    Rhea. P Liem

Authors
  1. Dan Sun
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  2. Shengyuan Li
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  3. Chengwei Fei
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  4. Yanting Ai
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  5. Rhea. P Liem
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Corresponding author

Correspondence to Chengwei Fei.

Additional information

Recommended by Associate Editor Doo Ho Lee

Dan Sun is an Associate Professor in the School of Aero-engine at Shenyang Aerospace University, China. His research interests include Rotor Dynamics, Flow-induced Vibration in Turbomachinery, Advanced Sealing Technology, Advanced Computational Fluid Dynamics, Rotating Machinery Faults Diagnosis.

Chengwei Fei received his Ph.D. in 2014 from Beihang University (BUAA), China, and then worked as a Postdoctoral Fellow and Research Fellow until 2018 at The Hong Kong Polytechnic University and Hong Kong University of Science and Technology, respectively, Hong Kong. Now he is a Research Professor since 2018 at Fudan University. His research interests include rotor dynamics, structural reliability and health monitoring for aero-engine and aircraft.

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Sun, D., Li, S., Fei, C. et al. Investigation of the effect of cavitation and journal whirl on static and dynamic characteristics of journal bearing. J Mech Sci Technol 33, 77–86 (2019). https://doi.org/10.1007/s12206-018-1208-3

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  • DOI: https://doi.org/10.1007/s12206-018-1208-3

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