0
Research Papers

Particle Image Velocimetry Analysis on the Effect of Stator Loading on Transonic Blade-Row Interactions

[+] Author and Article Information
Scott B. Reynolds, Steven E. Gorrell

Department of Mechanical Engineering,  Brigham Young University, Provo, UT 84602

Jordi Estevadeordal1

 Innovative Scientific Solutions, Inc. Dayton, OH 45440

1

Currently at GE Global Research, Niskayuna, NY 12309.

J. Turbomach 134(6), 061012 (Sep 04, 2012) (9 pages) doi:10.1115/1.4006585 History: Received October 20, 2010; Revised October 05, 2011; Published September 04, 2012; Online September 04, 2012

Experiments were performed to investigate interactions between a loaded stator and transonic rotor. The blade row interaction (BRI) rig was used to simulate an embedded transonic fan stage with realistic geometry (thin trailing edge), which produces a wake through diffusion. Details of the unsteady flow field between the stator and rotor were obtained using PIV. Flow-visualization images and PIV data that facilitate analysis of vortex shedding, wake motion, and wake-shock-interaction phenomena are presented. Stator wake and rotor-bow-shock interactions were analyzed for three stator/rotor axial spacings and two stator loadings. Specific shed vortices and wake topological features were isolated for each configuration. The data analysis focuses on measuring the vortex size, strength, and location as it forms on the stator trailing edge and propagates downstream into the rotor passage. It was observed that vortex shedding is synchronized to the passing of a rotor bow shock. Results show that the circulation of a vortex increased by 19% to 23% from far to close spacing due to the increased strength of the rotor bow shock impacting the stator trailing edge. Reduction in stator loading decreased shed vortex circulation for the same stator/rotor axial spacing by 20% to 25%. Pitchwise radius of vortices also decreased by 13% to 19% from far to close spacing. Such changes in vortex size and strength should be accounted for to predict the effect of unsteady blade-row interactions on transonic compressor performance.

FIGURES IN THIS ARTICLE
<>
Copyright © 2012 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Blade-row-interaction (BRI) rig cross section in its general configuration

Grahic Jump Location
Figure 2

Swirler and Deswirler shapes at 50% span, laser sheet projection, and window where PIV was taken

Grahic Jump Location
Figure 3

Photograph of vane of interest in BRI rig

Grahic Jump Location
Figure 4

Far spacing, 50% span, nominal loading. Median velocity with vorticity contours for one blade period (0, 20, 40, 60, 80, 100, 120 μs blade delay from top to bottom).

Grahic Jump Location
Figure 5

Far spacing, 50% span, decreased loading. Median velocity with vorticity contours for one blade period (0, 20, 40, 60, 80, 100, and 120 μs blade delay from top to bottom).

Grahic Jump Location
Figure 6

Mid spacing, 50% span, nominal loading. Median velocity with vorticity contours for one blade period (0, 20, 40, 60, 80, 100, and 120 μs blade delay from top to bottom).

Grahic Jump Location
Figure 7

Mid spacing, 50% span, decreased loading. Median velocity with vorticity contours for one blade period (0, 20, 40, 60, 80, 100, and 120 μs blade delay from top to bottom).

Grahic Jump Location
Figure 8

Close spacing, 50% span, nominal loading. Median velocity with vorticity contours for one blade period (0, 40, 60, 80, 100, and 120 μs blade delay from top to bottom).

Grahic Jump Location
Figure 9

Integration paths for calculation of circulation

Grahic Jump Location
Figure 10

Vortices at 20% meridional chord length for close, mid, and far spacings at nominal loading

Grahic Jump Location
Figure 11

Vortices at 20% meridional chord length for mid and far spacings (top to bottom) at decreased loading

Grahic Jump Location
Figure 12

Circulation of weaker vortices at mid and far spacings (top and bottom) for nominal and decreased loadings

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