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Accession Number:
ADA000841
Title:
Holographic Visualization of Compressor Blade Wake Interaction.
Descriptive Note:
Final technical rept. 19 Mar 73-19 Jan 74,
Corporate Author:
PRATT AND WHITNEY AIRCRAFT EAST HARTFORD CONN
Report Date:
1974-03-25
Pagination or Media Count:
40.0
Abstract:
Successful holographic studies were made of unsteady aerodynamic effects within the stator passage of a single-stage test compressor operating at tip speeds between 1400 and 1600 feet per second. A shock wave associated with the rotor trailing edge was observed to reflect from the stator vanes, producing a characteristic downstream array of shock segments. This array possesses a helical structure which will excite propagating acoustic modes of duct, and will affect the interpretation of instrument readings and of downstream noise phenomena. A systematic variation of density gradients was observed within the stator passages, consistent with a wake transport theory previously developed by Kerrebrock and Mikolajczak. Both point-source and diffuse-background holograms were employed, the latter in the form of double exposures which yielded shearing differential interferograms.
Distribution Statement:
APPROVED FOR PUBLIC RELEASE