0
TECHNICAL PAPERS

Unsteady Hydrodynamic Forces due to Rotor-Stator Interaction on a Diffuser Pump With Identical Number of Vanes on the Impeller and Diffuser

[+] Author and Article Information
M. Zhang

Department of Mechanical Engineering,  Kyushu Institute of Technology, 1-1 Sensui-cho, Tobata, Kitakyushu, 804-8550 Japan

H. Tsukamoto

Department of Biological Functions and Engineering, Graduate School of Life Science and Systems Engineering,  Kyushu Institute of Technology, 2-4, Hibikino, Wakamatsu, Kitakyushu, 808-0196 Japan

J. Fluids Eng 127(4), 743-751 (Apr 01, 2005) (9 pages) doi:10.1115/1.1949640 History: Received August 20, 2003; Revised March 26, 2005; Accepted April 01, 2005

Experimental and computational study was developed for unsteady hydrodynamic forces on a diffuser pump impeller excited by the interaction between the impeller and the vaned diffuser with the same number of vanes as impeller. Unsteady flow calculations are made using commercially available CFD software, CFX-TASCflow, as well as the two-dimensional vortex method. Calculated pressure and fluid forces on the impeller show good agreement with measured ones. It has been demonstrated that the fluid forces on the impeller with the same number of vanes as the vaned diffuser are smaller compared with other combinations of vane numbers. However, the pressure fluctuations are found to be greater than other cases.

Copyright © 2005 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Schematic view of test rig and instrumentation system

Grahic Jump Location
Figure 2

Schematics of fluid force measurement system

Grahic Jump Location
Figure 3

Schematics of reference coordinate systems for test diffuser pump

Grahic Jump Location
Figure 4

Locations of pressure taps in vaned diffuser

Grahic Jump Location
Figure 5

Computational domain and grids: (a) Impeller and diffuser; (b) casing and pipe systems

Grahic Jump Location
Figure 6

Schematics of coordinate system and control volume for fluid force calculation

Grahic Jump Location
Figure 7

(a) Effect of time step on dynamic fluid forces for rated condition and (b) effect of grid density on dynamic fluid forces for rated condition

Grahic Jump Location
Figure 8

Steady characteristic curves of test pump; experimental uncertainty in ϕ=±2.1%, in Ψ=±2.3%, in KR¯=±2.5%

Grahic Jump Location
Figure 9

Time histories of dynamic fluid forces; Zd=6; experimental uncertainty in Kx=±1.7%: (a) Effect of rotational speed, ϕ∕ϕ0=1.0; (b) effect of flow rate, N=1750min−1

Grahic Jump Location
Figure 10

Time histories of dynamic fluid forces for various diffuser vane numbers (N=1750min−1,ϕ∕ϕ0=1.0), experimental uncertainty in Kx=±1.7%: (a) Measured, (b) CFD predicted, and (c) calculated by vortex method

Grahic Jump Location
Figure 11

Velocity diagram calculated by TACS flow (at t=t1 in Fig. 1(b): (a) Zd=6 and (b) Zd=5

Grahic Jump Location
Figure 12

Vorticity distribution and velocity vectors calculated by vortex method (at t=t2 in Fig. 1(c)): (a) Zd=6 and (b) Zd=5

Grahic Jump Location
Figure 13

Pressure fluctuation at station (r1,c1),ϕ∕ϕ0=1.0, experimental uncertainty in f=±3.1%, in Sxx=±5.5%, (a) time histories of ΔCp and (b) power spectrum

Grahic Jump Location
Figure 14

Calculated pressure fluctuation in vaned diffuser passage ϕ∕ϕ0=1.0: (a) Station (r1,c1), (b) station (r2,c1), and (c) station (r3,c1)

Grahic Jump Location
Figure 15

Pressure fluctuations at pump inlet, ϕ∕ϕ0=1.0: (a) CFD predicted and (b) measured

Grahic Jump Location
Figure 16

Calculated pressure fluctuation at pump discharge

Grahic Jump Location
Figure 17

Power spectra of measured pressure fluctuation at pump suction and discharge pipe; experimental uncertainty in f=±2.3%, in Sxx=±4.1%

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