Turbine blade platform film cooling with simulated stator-rotor purge flow with varied seal width and upstream wake with vortex

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dc.contributorHan, Je-Chin
dc.creatorBlake, Sarah Anne
dc.date.accessioned2010-01-14T23:58:31Z
dc.date.accessioned2010-01-16T01:39:06Z
dc.date.accessioned2017-04-07T19:56:19Z
dc.date.available2010-01-14T23:58:31Z
dc.date.available2010-01-16T01:39:06Z
dc.date.available2017-04-07T19:56:19Z
dc.date.created2007-05
dc.date.issued2009-05-15
dc.description.abstractThe 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.
dc.identifier.urihttp://hdl.handle.net/1969.1/ETD-TAMU-1340
dc.language.isoen_US
dc.subjectgas turbine
dc.subjectrotor
dc.subjectplatform
dc.subjectfilm cooling
dc.subjectvane
dc.subjectunsteady wake
dc.subjectpassage vortex
dc.subjectstator-rotor seal
dc.subjectslot injection
dc.subjectpressure-sensitive paint
dc.subjectfilm cooling effectiveness
dc.titleTurbine blade platform film cooling with simulated stator-rotor purge flow with varied seal width and upstream wake with vortex
dc.typeBook
dc.typeThesis

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