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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

[+] Author and Article Information
R. M. Mathison

Gas Turbine Laboratory, The Ohio State University, 2300 West Case Road, Columbus, OH 43235mathison.4@osu.edu

C. W. Haldeman

Gas Turbine Laboratory, The Ohio State University, 2300 West Case Road, Columbus, OH 43235haldeman.5@osu.edu

M. G. Dunn

Gas Turbine Laboratory, The Ohio State University, 2300 West Case Road, Columbus, OH 43235dunn.129@osu.edu

J. Turbomach 134(1), 011008 (May 25, 2011) (9 pages) doi:10.1115/1.4002996 History: Received August 17, 2010; Revised August 23, 2010; Published May 25, 2011; Online May 25, 2011

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.

Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic of heat-flux gauge and thermocouple locations on blade platform (not to scale)

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Figure 2

Comparison of hot-streak metal temperatures

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Figure 3

Comparison of hot-streak fluid temperatures measured by upstream rakes at 37.5% pitch

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Figure 4

Change in rotor inlet temperature profile with introduction of cooling

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Figure 5

Comparison of Stanton number for pressure surface of HPB with cooling introduction

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Figure 6

Comparison of Stanton number for suction surface of HPB with cooling introduction

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Figure 7

Comparison of platform Stanton numbers for cooling variation runs

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Figure 8

Comparison of Stanton number with cooling variation for blade angel wing region

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Figure 9

Comparison of Stanton number with cooling variation for blade tip and outer shroud

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Figure 10

Fluid temperature at blade leading edge for three magnitudes of hot streak aligned with vane midpassage

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Figure 11

Influence of hot-streak magnitude on blade pressure surface Stanton number

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Figure 12

Influence of hot-streak magnitude on blade suction surface Stanton number

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Figure 13

Influence of hot-streak magnitude on Stanton number for blade platform

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Figure 14

Influence of hot-streak magnitude on Stanton number for outer shroud and blade tip

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Figure 15

Fluid temperature at blade leading edge for clocked high-magnitude hot streaks

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Figure 16

Influence of hot-streak alignment on pressure surface Stanton number for large amplitude hot streak

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Figure 17

Influence of hot-streak alignment on suction surface Stanton number for large amplitude hot streak

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Figure 18

Influence of high magnitude hot-streak alignment on Stanton number for blade platform

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Figure 19

Influence of high magnitude hot-streak alignment on Stanton number for outer shroud and blade tip

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Figure 20

Influence of cooling on time-accurate surface temperature fluctuation for hot streak aligned with midpassage for gauge HR150 on suction surface

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Figure 21

Influence of cooling on time-accurate surface temperature fluctuation for hot streak aligned with midpassage for gauge HR154 on suction surface

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Figure 22

Influence of hot-streak alignment on time-accurate surface temperature fluctuation for gauge HR150 on suction surface

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Figure 23

Influence of hot-streak magnitude on time-accurate surface temperature fluctuation for gauge HR150 on suction surface

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