Measurements of aerodynamic wall shear stress with heated thin film gauges

M. R.D. Davies, J. E. Fitzgerald, J. T. Duffy, F. K. O'Donnell

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Previous publications have demonstrated the method of heated thin film gauge aerodynamic wall shear stress calibration in a laminar flow with a favourable free stream pressure gradient. Further evidence, derived from calibrating a gauge in laminar pipe flow and flow over a wedge, supports both the format of the calibrating equation and the value of the calibration constants. The pipe flow calibration is extended into turbulent flow and it is shown that the format of the calibrating equatinn remains unchanged whilst the value of the first constant changes markedly. The calibration constants are applicable to any such gauges mounted on an aluminium substrate in air flow operated at the same overheat temperature. The calibratinn constants are then applied to allow measurement of the wall shear stress in a low pressure gradient reginn of the suction surface of a linear cascade turbine blade. Finally, these measurements are compared favourably with those taken from a calibrated Preston tube mounted on the same blade.

Original languageEnglish
Title of host publicationManufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791878712
DOIs
Publication statusPublished - 1997
EventASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition, GT 1997 - Orlando, United States
Duration: 2 Jun 19975 Jun 1997

Publication series

NameProceedings of the ASME Turbo Expo
Volume4

Conference

ConferenceASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition, GT 1997
Country/TerritoryUnited States
CityOrlando
Period2/06/975/06/97

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