The turbine blade platform can be protected from hot mainstream gases by injecting
cooler air through the gap between stator and rotor. The effectiveness of this film
cooling method depends on the geometry of the slot, the quantity of injected air, and the
secondary flows near the platform. The purpose of this study was to measure the effect
of the upstream vane or stator on this type of platform cooling, as well as the effect of
changes in the width of the gap.
Film cooling effectiveness distributions were obtained on a turbine blade platform within
a linear cascade with upstream slot injection. The width of the slot was varied as well as
the mass flow rate of the injected coolant. Obstacles were placed upstream to model the
effect of the upstream vane. The coolant was injected through an advanced labyrinth
seal to simulate purge flow through a stator-rotor seal. The width of the opening of this
seal was varied to simulate the effect of misalignment. Stationary rods were placed
upstream of the cascade in four phase locations to model the unsteady wake formed at
the trailing edge of the upstream vane. Delta wings were also placed in four positions to
create a vortex similar to the passage vortex at the exit of the vane. The film cooling
effectiveness distributions were measured using pressure-sensitive paint (PSP).
Reducing the width of the slot was found to decrease the area of coolant coverage,
although the film cooling effectiveness close to the slot was slightly increased. The
unsteady wake was found to have a trivial effect on platform cooling, while the passage
vortex from the upstream vane may significantly reduce the film cooling effectiveness.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/ETD-TAMU-1340 |
| Date | 15 May 2009 |
| Creators | Blake, Sarah Anne |
| Contributors | Han, Je-Chin |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Thesis, text |
| Format | electronic, application/pdf, born digital |
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