The American Petroleum Institute (API) level II vibration stability analysis for impellers requires higher fidelity models to predict the dynamic forces of the whirling impeller. These forces are in turn required to predict the vibration stability, critical speeds, and steady-state vibration response of the shaft-bearing-seal-impeller system. A transient computational fluid dynamics (CFD)-based approach is proposed which is applicable to nonaxisymmetric turbomachinery components, such as the volute and/or diffuser vanes, unlike its predecessor models like the bulk-flow or the quasi-steady model. The key element of this approach is the recent advancements in mesh deformation techniques which permit less restrictive motion boundary conditions to be imposed on the whirling impeller. The results quantify the contributions of the volute and/or the diffuser to the total forces which guides the analyst on whether to include these components in the model. The numerical results obtained by this approach are shown to agree well with experimental measurements and to be superior to the earlier quasi-steady alternative in terms of accuracy. Furthermore, several volute shapes were designed and analyzed for the sensitivity of the solution to the geometrical properties of the volute. The design flow rotordynamic forces show a significant dependence on the presence of the volutes in the model, with the specific shape of the volute having a lesser influence. The dimensionless forces are shown to be almost independent of the spin speed.
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October 2018
Research-Article
Rotordynamic Force Coefficients of Volutes and Diffusers for Prediction of Turbomachinery Vibration
Farzam Mortazavi,
Farzam Mortazavi
Mem. ASME
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843
e-mail: farzam.mortazavi@tamu.edu
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843
e-mail: farzam.mortazavi@tamu.edu
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Alan Palazzolo
Alan Palazzolo
James J. Cain Professor I
Fellow ASME
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843
e-mail: a-palazzolo@tamu.edu
Fellow ASME
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843
e-mail: a-palazzolo@tamu.edu
Search for other works by this author on:
Farzam Mortazavi
Mem. ASME
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843
e-mail: farzam.mortazavi@tamu.edu
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843
e-mail: farzam.mortazavi@tamu.edu
Alan Palazzolo
James J. Cain Professor I
Fellow ASME
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843
e-mail: a-palazzolo@tamu.edu
Fellow ASME
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843
e-mail: a-palazzolo@tamu.edu
Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received July 28, 2017; final manuscript received March 12, 2018; published online April 27, 2018. Assoc. Editor: Costin Untaroiu.
J. Vib. Acoust. Oct 2018, 140(5): 051015 (12 pages)
Published Online: April 27, 2018
Article history
Received:
July 28, 2017
Revised:
March 12, 2018
Citation
Mortazavi, F., and Palazzolo, A. (April 27, 2018). "Rotordynamic Force Coefficients of Volutes and Diffusers for Prediction of Turbomachinery Vibration." ASME. J. Vib. Acoust. October 2018; 140(5): 051015. https://doi.org/10.1115/1.4039725
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