0
research-article

NONLINEAR ANALYSIS OF ROTORDYNAMIC FLUID FORCES IN THE ANNULAR PLAIN SEAL BY USING EXTENDED BULK-FLOW ANALYSIS (INFLUENCE OF STATIC ECCENTRICITY AND WHIRLING AMPLITUDE)

[+] Author and Article Information
Koya Yamada

ASME Student Member, Nagoya Univ. Dept. of Mechanical Systems Engineering, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
k_yamada@nuem.nagoya-u.ac.jp

Atsushi Ikemoto

Non-Member, Nagoya Univ. Dept. of Mechanical Systems Engineering, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
notitui55@gmail.com

Tsuyoshi Inoue

ASME Member, Nagoya Univ. Dept. of Mechanical Systems Engineering, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
inoue.tsuyoshi@nagoya-u.jp

Masaharu Uchiumi

ASME Member, Muroran Institute of Technology, 27-1 Mizumoto-cho, Muroran, Hokkaido, 050-8585, Japan
uchiumi@mmm.muroran-it.ac.jp

1Corresponding author.

ASME doi:10.1115/1.4041128 History: Received July 02, 2018; Revised July 17, 2018

Abstract

Rotor-dynamic (RD) fluid force of turbo-machinery is one of the causes of the shaft vibration problem. Bulk flow method has been widely used for analyzing this RD fluid force in the design stage. Conventional bulk flow method has been carried out under the assumption of concentric circular shaft's orbit with small amplitude. However, actual rotating machinery's operating condition often does not hold this assumption, and conventional bulk flow method may not be applicable for the analysis of RD fluid force in such situation. In this paper, RD fluid force of the annular plain seal in the case of circular whirling orbit with both the significant static eccentricity and the moderate whirling amplitude is investigated. The perturbation analysis of the bulk flow method is extended to investigate RD fluid force in such cases. As a result, a set of nonlinear analytical equations of the extended bulk flow method, for the case with both the significant static eccentricity and the moderate whirling amplitude, is deduced. The occurrence of constant component, backward synchronous component and super-harmonic components is observed in addition to the forward synchronous component in the RD fluid force for such cases. These analytical results of RD fluid force and its linear coefficients are compared with the numerical results using finite difference analysis and experimental results. As a result, the validity of the extended bulk flow method for the case with both the significant static eccentricity and the moderate whirling amplitude is confirmed.

Copyright (c) 2018 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In