The influence of hot-streak magnitude and alignment relative to the vane leading edge on blade row heat flux is investigated for a one and one-half stage high-pressure turbine with a film-cooled vane, purge cooling, and uncooled blades. The full-stage turbine is operated at design-corrected conditions. In addition to investigating the impact of different hot-streak characteristics, this study also looks at the interaction of cooling flow with the hot streaks. This paper builds on the investigation of profile migration utilizing temperature measurements presented in Part I and the heat transfer measurements presented in Part II. Hot streaks aligned with the vane midpitch have a greater impact on blade temperatures and heat-flux values than hot streaks aligned with the vane leading edge. The leading edge hot streaks tend to be mixed out over the surface of the vane. The magnitude of the hot streak is observed to have the largest influence on the temperature and heat flux for the downstream blade. Time-accurate measurements confirm these conclusions and indicate that further analysis of the time-accurate data is warranted. Film cooling is found to impact a hot-streak profile in a way similar to that observed for a radial profile. Differences in core to coolant temperature ratio cause the uniform profile to show different coolant effects, but the overall spread of the cooling appears similar.
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e-mail: mathison.4@osu.edu
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January 2012
Research Papers
Aerodynamics and Heat Transfer for a Cooled One and One-Half Stage High-Pressure Turbine—Part III: Impact of Hot-Streak Characteristics on Blade Row Heat Flux
R. M. Mathison,
R. M. Mathison
Gas Turbine Laboratory,
e-mail: mathison.4@osu.edu
The Ohio State University
, 2300 West Case Road, Columbus, OH 43235
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C. W. Haldeman,
C. W. Haldeman
Gas Turbine Laboratory,
e-mail: haldeman.5@osu.edu
The Ohio State University
, 2300 West Case Road, Columbus, OH 43235
Search for other works by this author on:
M. G. Dunn
M. G. Dunn
Gas Turbine Laboratory,
e-mail: dunn.129@osu.edu
The Ohio State University
, 2300 West Case Road, Columbus, OH 43235
Search for other works by this author on:
R. M. Mathison
Gas Turbine Laboratory,
The Ohio State University
, 2300 West Case Road, Columbus, OH 43235e-mail: mathison.4@osu.edu
C. W. Haldeman
Gas Turbine Laboratory,
The Ohio State University
, 2300 West Case Road, Columbus, OH 43235e-mail: haldeman.5@osu.edu
M. G. Dunn
Gas Turbine Laboratory,
The Ohio State University
, 2300 West Case Road, Columbus, OH 43235e-mail: dunn.129@osu.edu
J. Turbomach. Jan 2012, 134(1): 011008 (9 pages)
Published Online: May 25, 2011
Article history
Received:
August 17, 2010
Revised:
August 23, 2010
Online:
May 25, 2011
Published:
May 25, 2011
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Citation
Mathison, R. M., Haldeman, C. W., and Dunn, M. G. (May 25, 2011). "Aerodynamics and Heat Transfer for a Cooled One and One-Half Stage High-Pressure Turbine—Part III: Impact of Hot-Streak Characteristics on Blade Row Heat Flux." ASME. J. Turbomach. January 2012; 134(1): 011008. https://doi.org/10.1115/1.4002996
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