Effects of freestream turbulence on turbine blade heat transfer in transonic flow

dc.contributor.authorJohnson, Loren Pattonen
dc.contributor.committeecochairDiller, Thomas E.en
dc.contributor.committeecochairNg, Faien
dc.contributor.committeememberNelson, Douglas J.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T21:28:02Zen
dc.date.adate2009-01-31en
dc.date.available2014-03-14T21:28:02Zen
dc.date.issued1995-05-05en
dc.date.rdate2009-01-31en
dc.date.sdate2009-01-31en
dc.description.abstractThe effects of grid generated freestream turbulence on surface heat transfer to turbine blades were measured experimentally. Time-resolved and unsteady heat flux measurements were made with Heat Flux Microsensors at two positions on the suction side of turbine blades. The experiments were conducted on a stationary cascade of aluminum turbine blades for heated runs at transonic conditions. Non-dimensional flow parameters were matched to actual engine conditions including the design exit Mach number of 1.26 and the gas-to-wall temperature ratio of 1.4. Methods for determining the adiabatic wall temperature and heat transfer coefficient are presented and the results are compared to computer predictions for these blades. Heat transfer measurements were taken with a new, directly deposited HFM gage near the trailing edge shock on nitrogen cooled blades. The average heat transfer coefficient for Mach 1.26 was 765 W/(m² °C) and matched well with a predicted value of 738 W/(m² °C). Freestream turbulence effects were studied at a second gage location 1.0 cm from the stagnation point on uncooled blades. Results at this location show an increase in freestream turbulence from 1 % to 8% led to a 15% increase of the average heat transfer coefficient and also matched well with predictions. The fast response time of the HFM illustrated graphically the increase in energy spectra due to freestream turbulence at the 0 - 10kHz range. The heat flux turbulence intensity (Tu<sub>q</sub>) was defined as another physical quantity important to turbine blade heat transfer.en
dc.description.degreeMaster of Scienceen
dc.format.extentxvi, 157 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-01312009-063212en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-01312009-063212/en
dc.identifier.urihttp://hdl.handle.net/10919/40836en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1995.J486.pdfen
dc.relation.isformatofOCLC# 34408875en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectheat flux measurementsen
dc.subject.lccLD5655.V855 1995.J486en
dc.titleEffects of freestream turbulence on turbine blade heat transfer in transonic flowen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen
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