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complementary aerodynamic performance datasets for variable speed power turbine blade section from two independent transonic turbine cascadesTwo independent experimental studies were conducted in linear cascades on a scaled, two-dimensional mid-span section of a representative Variable Speed Power Turbine (VSPT) blade. The purpose of these studies was to assess the aerodynamic performance of the VSPT blade over large Reynolds number and incidence angle ranges. The influence of inlet turbulence intensity was also investigated. The tests were carried out in the NASA Glenn Research Center Transonic Turbine Blade Cascade Facility and at the University of North Dakota (UND) High Speed Compressible Flow Wind Tunnel Facility. A large database was developed by acquiring total pressure and exit angle surveys and blade loading data for ten incidence angles ranging from +15.8deg to −51.0deg. Data were acquired over six flow conditions with exit isentropic Reynolds number ranging from 0.05×106 to 2.12×106 and at exit Mach numbers of 0.72 (design) and 0.35. Flow conditions were examined within the respective facility constraints. The survey data were integrated to determine average exit total-pressure and flow angle. UND also acquired blade surface heat transfer data at two flow conditions across the entire incidence angle range aimed at quantifying transitional flow behavior on the blade. Comparisons of the aerodynamic datasets were made for three "match point" conditions. The blade loading data at the match point conditions show good agreement between the facilities. This report shows comparisons of other data and highlights the unique contributions of the two facilities. The datasets are being used to advance understanding of the aerodynamic challenges associated with maintaining efficient power turbine operation over a wide shaft-speed range.
Document ID
20150022187
Document Type
Conference Paper
Authors
Flegel, Ashlie B.
(NASA Glenn Research Center Cleveland, OH United States)
Welch, Gerard E.
(NASA Glenn Research Center Cleveland, OH United States)
Giel, Paul W.
(Vantage Partners, LLC Brook Park, OH, United States)
Ames, Forrest E.
(North Dakota Univ. Grand Forks, ND, United States)
Long, Jonathan A.
(North Dakota Univ. Grand Forks, ND, United States)
Date Acquired
December 2, 2015
Publication Date
October 25, 2015
Subject Category
Aerodynamics
Report/Patent Number
ISABE 2015-20163
GRC-E-DAA-TN23722
Meeting Information
International Symposium on Air Breathing Engines (ISABE 2015)(Phoenix, AZ)
Funding Number(s)
CONTRACT_GRANT: NNC12BA01B
WBS: WBS 644817.02.03.02.01.01
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Cascade
Rotary Wing
Variable Speed
Turbine

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