NDLI: Effects of Freestream Turbulence on the Losses of a Highly-Loaded Compressor Stator Blade

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Douglas, J. W. Li, S. -M Song, B. Ng, W. F. Sonoda, Toyotaka Arima, Toshiyuki
Copyright Year	2003
Abstract	Very little published literature documents the effects of different freestream turbulence intensities on compressor flows at realistically high Reynolds numbers. This paper presents a study of these effects on a transonic, linear, compressor stator cascade. The cascade consisted of high turning stator airfoils that had the camber of 55 degrees. The effects of freestream turbulence intensities of approximately 0.1% (baseline) and 1.6% were examined. Inlet Mach numbers to the cascade were tested from 0.55 to 0.89. Reynolds numbers, based on the inlet conditions and blade chord, varied between 1.0–2.0×106. Inlet flow angles to the cascade ranged from a choking to a stall condition. For the baseline cases, at most positive incidence angles to the cascade, surface oil flow visualization and Schlieren pictures showed a significant flow separation on the suction surface of the blade. Under these conditions, the increase in freestream turbulence from 0.1% to 1.6% significantly reduced the flow losses of the cascade (by as much as 57% in some cases). In other test conditions where no evidence depicted flow separation on the blade, there were no measurable effects on the losses due to the increase in freestream turbulence intensity. In addition, the increase of freestream turbulence intensity also improved the effective operating range of the cascade significantly (e.g., by 46% or higher).
Sponsorship	International Gas Turbine Institute
Starting Page	521
Ending Page	530
Page Count	10
File Format	PDF
ISBN	0791836894
DOI	10.1115/GT2003-38604
e-ISBN	0791836711
Volume Number	Volume 6: Turbo Expo 2003, Parts A and B
Conference Proceedings	ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference
Language	English
Publisher Date	2003-06-16
Publisher Place	Atlanta, Georgia, USA
Access Restriction	Subscribed
Subject Keyword	High reynolds number Freestream turbulence High turning airfoil Transonic compressor cascade Turbulence Blades Cascades (fluid dynamics) Reynolds number Stators Airfoils Compressors
Content Type	Text
Resource Type	Article

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