0
Research Papers

A Method for Identifying and Visualizing Foreign Particle Motion Using Time-Resolved Particle Tracking Velocimetry

[+] Author and Article Information
N. D. Cardwell, P. P. Vlachos

Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061

K. A. Thole

Department of Mechanical and Nuclear Engineering, Pennsylvania State University, University Park, PA 16802

J. Turbomach 133(2), 021021 (Oct 26, 2010) (10 pages) doi:10.1115/1.4001187 History: Received July 26, 2009; Revised September 04, 2009; Published October 26, 2010; Online October 26, 2010

Gas turbines for aircraft are designed for operation with a clean inlet air flow. This ideal operational condition is often violated during take-off and landing, where the probability of particle ingestion is high, with sand and dirt being the most commonly observed foreign particles. Current research on particle ingestion has identified several mechanisms that contribute to performance degradation in the turbine: erosion of internal and external surfaces, and flow blockages of film-cooling holes and internal cooling passages. The focus of the study given in this paper is to present a method that identifies the motion of foreign particles within an internal ribbed passage. The method uses a high-resolution, flow field interrogation method known as time-resolved digital particle image velocimetry (TRDPIV). Observations from the two-phase flows showed that particle collisions occurred more frequently on the upstream surface of the ribs, especially in the inlet region. Results from these collisions included substantial particle breakup, and a particle rebounding phenomenon between the upper and lower walls. Comparisons are made to large eddy simulation predicted particle trajectories indicating some agreement, as well as phenomena that are not predicted due to the inherent assumption of the modeling.

Copyright © 2011 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Gas turbines operated in dusty environments

Grahic Jump Location
Figure 2

Illustration of the rib channel

Grahic Jump Location
Figure 3

Section view showing the inlet (first rib) and fully developed (12th rib) measurement planes

Grahic Jump Location
Figure 4

TRDPIV experimental setup

Grahic Jump Location
Figure 5

Illustration of a laser sheet being passed through the lower channel wall

Grahic Jump Location
Figure 6

Size distributions for the test sands obtained by a Horiba LA-950

Grahic Jump Location
Figure 7

Contours of the normalized turbulent kinetic energy overlaid with the mean velocity stream traces for Re=20,000 at the (a) inlet and (b) developed sections (21)

Grahic Jump Location
Figure 15

Illustration of high (dashed) and an intermediate (solid) Stokes number particles moving through a staggered rib-roughened channel

Grahic Jump Location
Figure 14

Set of images tracking the particle breakup of a large AzRD particle colliding with the rib (multi-exposed)

Grahic Jump Location
Figure 13

Succession of images illustrating the particle motion of AzRD (dmin=0.1 μm, dmax=1000 μm) at Re=20,000 (dashed arrows reflect the particles located in multiple images)

Grahic Jump Location
Figure 12

Succession of images with arrows illustrating the particle motion of sieved AzRD (dmin=77 μm, dmax=517 μm) at Re=20,000 (dashed arrows reflect the particles located in multiple images)

Grahic Jump Location
Figure 11

Succession of images illustrating the particle motion of the ISO coarse test sand (dmin=0.1 μm, dmax=243 μm) at Re=20,000 (dashed arrows reflect the particles located in multiple images)

Grahic Jump Location
Figure 10

Instantaneous flow sample in the fully developed section for the (a) streamwise magnitude and (b) vorticity magnitudes at Re=2500(21)

Grahic Jump Location
Figure 9

Comparisons above the 12th rib of the mean (a) streamwise velocity, (b) streamwise velocity fluctuations, and (c) spanwise velocity fluctuations between PIV, LDV, and CFD in the fully developed region at Re=20,000

Grahic Jump Location
Figure 8

Comparisons in the inter-rib region of the mean (a) streamwise velocity, (b) streamwise velocity fluctuations, and (c) spanwise velocity fluctuations between PIV, LDV, and CFD in the fully developed region at Re=20,000

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