0
TECHNICAL PAPERS

Effects of Seal Geometry on Dynamic Impeller Fluid Forces and Moments

[+] Author and Article Information
Yoshiki Yoshida, Yoshinobu Tsujimoto, Goh Morimoto, Hiroki Nishida

Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan

Shigeki Morii

Mitsubishi Heavy Industries, Ltd., Yokohama R&D Center, 12 Nishikimachi, Nakaku, Yokohama, Kanagawa 231-8715, Japan

J. Fluids Eng 125(5), 786-795 (Oct 07, 2003) (10 pages) doi:10.1115/1.1598988 History: Received December 18, 2001; Revised April 09, 2003; Online October 07, 2003
Copyright © 2003 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Mechanism to produce the impeller whirling motion
Grahic Jump Location
Cross section of the test facility (impeller, vaneless diffuser, and collector)
Grahic Jump Location
Configuration of test seals, Seal A, B, and C
Grahic Jump Location
Scheme showing the fluid-induced forces Fr and Ft, and force moments. Mr and Mt (ε: eccentricity, Ω: shaft rotational speed, ω: whirling speed, “O”: impeller center on the whirl orbit, (r,t): radial and tangential to the whirl orbit)
Grahic Jump Location
Pressure performance of the test impeller (ε=0,ω/Ω=0). Pressure coefficient ψ at the collector, ψs at the diffuser inlet, and pressure fluctuation ΔCp1 at the diffuser inlet, versus flow coefficient ϕ (uncertainty in ψ, ψs±0.01, in ϕ±0.01).
Grahic Jump Location
Spectral analyses of pressure fluctuations at the diffuser inlet P1 in case of Seal A, for ε=0 and ω/Ω=0 (uncertainty in ϕ±0.01)
Grahic Jump Location
Dimensionless fluid force fr (○) and ft, (•) and fluid force moment mr (○) and mt (•) on the impeller with Seal A versus whirling speed ratio ω/Ω for various flow coefficients ϕ (ε=1.05 mm) (uncertainty in fr,ft±0.3,mr,mt±0.3, in ω/Ω±0.002, in ϕ±0.01)
Grahic Jump Location
Dimensionless fluid force fr (○) and ft, (•) and fluid force moment mr (○) and mt (•) on the impeller with Seal B versus whirling speed ratio ω/Ω for various flow coefficients ϕ (ε=1.05 mm) (uncertainty in fr,ft±0.3,mr,mt±0.3, in ω/Ω±0.002, in ϕ±0.01)
Grahic Jump Location
Dimensionless fluid force fr (○) and ft, (•) and fluid force moment mr (○) and mt (•) on the impeller with Seal C versus whirling speed ratio ω/Ω for various flow coefficients ϕ (ε=1.05 mm) (uncertainty in fr,ft±0.3,mr,mt±0.3, in ω/Ω±0.002, in ϕ±0.01)
Grahic Jump Location
Spectral analyses of the pressure fluctuations at the diffuser inlet P1 and the signal of force sensor for various flow rates in Seal A (ε=1.05 mm) (uncertainty in ω/Ω±0.002, in ϕ±0.01)
Grahic Jump Location
Comparison of the dimensionless fluid force f (○) due to the whirl with the dimensionless fluid force fRS (×) due to the rotating stall for various flow rates, in Seal A (ε=1.05 mm) (uncertainty in f±0.3,fRS±0.3, in ω/Ω±0.002, in ϕ±0.01)
Grahic Jump Location
Unsteady pressure pattern in the vaneless diffuser due to the rotating stall coupled with the whirl at ω/Ω=0.26 for ϕ=0.100 in Seal A and B (ε=1.05 mm) (uncertainty in ω/Ω±0.002, in ϕ±0.01)
Grahic Jump Location
Comparison of the dimensionless fluid force fr and ft (○) directly measured by the force sensor with the dimensionless pressure force frp and ftp (×) estimated by the unsteady pressure at the impeller outlet, versus whirling speed ratio ω/Ω for ϕ=0.100, in Seal A, B, and C (ε=1.05 mm) (uncertainty in fr,ft±0.3,frp,ftp±0.5, in ω/Ω±0.002, in ϕ±0.01).

Tables

Errata

Discussions

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