Latticework (Vortex) Cooling Effectiveness: Rotating Channel Experiments

[+] Author and Article Information
S. Acharya, F. Zhou, J. Lagrone, G. Mahmood

 Turbine Innovation and Energy Research (TIER) Center, Louisiana State University, Baton Rouge, LA 70803

R. S. Bunker

 General Electric Global Research Center, Niskayuna, NY 12309

J. Turbomach 127(3), 471-478 (Mar 01, 2004) (8 pages) doi:10.1115/1.1860381 History: Received October 01, 2003; Revised March 01, 2004

The heat transfer and pressure drop characteristics of latticework coolant blade passages have been investigated experimentally under conditions of rotation. Stationary studies with the latticework configuration have shown potential advantages including spatially-uniform streamwise distributions of the heat transfer coefficient, greater blade strength, and enhancement levels comparable to conventional rib turbulators. In the present study, a latticework coolant passage, with orthogonal-ribs, is studied in a rotating heat transfer test-rig for a range of Reynolds numbers (Res), Rotation numbers (Ros), and density ratios. Measurements indicate that for Res20,000, the latticework coolant passage provides very uniform streamwise distributions of the Nusselt number (Nus) with enhancement levels (relative to smooth-channel values) in the range of 2.0–2.5. No significant dependence of Nus on Ros and density ratio is observed except at lower Res values (10,000). Nusselt numbers are highest immediately downstream of a turn indicating that bend-effects play a major role in enhancing heat transfer. Friction factors are relatively insensitive to Ros, and thermal performance factors at higher Res values appear to be comparable to those obtained with conventional rib-turbulators. The present study indicates that latticework cooling geometry can provide comparable heat transfer enhancements and thermal performance factors as conventional rib-turbulators, with potential benefits of streamwise uniformity in the heat transfer coefficients and added blade strength.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Experimental setup

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Figure 2

Lattice geometry and flow paths

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Figure 3

Test Model (leading side)

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Figure 4

Lattice element details (all dimensions in cm)

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Figure 5

Channel-averaged Nusselt numbers as a function of Res

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Figure 6

Channel-averaged Nusselt numbers as a function of Ros

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Figure 7

Nusselt number distributions on individual rows for stationary channel

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Figure 8

Streamwise-averaged Nusselt numbers for stationary channel

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Figure 9

Spanwise average Nusselt numbers for stationary channel

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Figure 10

Spanwise average Nusselt numbers at Ros=0.012

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Figure 11

Rotation effects on the individual rows at Res=20k

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Figure 12

Rotation effects at Res=35k

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Figure 13

Rotation effects at Res=5k

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Figure 14

Nusselt number averaged over the whole channel versus DR (Res=10k)

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Figure 15

Density ratio effects at Ros=0.04 and Res=10k

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Figure 16

Friction factors at different (a) Ros and (b) Res

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Figure 17

Thermal performance factor



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