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 , Rotation numbers , and density ratios. Measurements indicate that for , the latticework coolant passage provides very uniform streamwise distributions of the Nusselt number with enhancement levels (relative to smooth-channel values) in the range of 2.0–2.5. No significant dependence of on and density ratio is observed except at lower values . 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 , and thermal performance factors at higher 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.
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July 2005
Technical Papers
Latticework (Vortex) Cooling Effectiveness: Rotating Channel Experiments
S. Acharya,
S. Acharya
Turbine Innovation and Energy Research (TIER) Center
, Louisiana State University, Baton Rouge, LA 70803
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F. Zhou,
F. Zhou
Turbine Innovation and Energy Research (TIER) Center
, Louisiana State University, Baton Rouge, LA 70803
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J. Lagrone,
J. Lagrone
Turbine Innovation and Energy Research (TIER) Center
, Louisiana State University, Baton Rouge, LA 70803
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G. Mahmood,
G. Mahmood
Turbine Innovation and Energy Research (TIER) Center
, Louisiana State University, Baton Rouge, LA 70803
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R. S. Bunker
R. S. Bunker
General Electric Global Research Center
, Niskayuna, NY 12309
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S. Acharya
Turbine Innovation and Energy Research (TIER) Center
, Louisiana State University, Baton Rouge, LA 70803
F. Zhou
Turbine Innovation and Energy Research (TIER) Center
, Louisiana State University, Baton Rouge, LA 70803
J. Lagrone
Turbine Innovation and Energy Research (TIER) Center
, Louisiana State University, Baton Rouge, LA 70803
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 12309J. Turbomach. Jul 2005, 127(3): 471-478 (8 pages)
Published Online: March 1, 2004
Article history
Received:
October 1, 2003
Revised:
March 1, 2004
Citation
Acharya, S., Zhou, F., Lagrone, J., Mahmood, G., and Bunker, R. S. (March 1, 2004). "Latticework (Vortex) Cooling Effectiveness: Rotating Channel Experiments." ASME. J. Turbomach. July 2005; 127(3): 471–478. https://doi.org/10.1115/1.1860381
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