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Holographic studies of shock waves within transonic fan rotorsPulsed laser holographic interferometry has been applied to the detection of shock patterns in the outer span regions of high tip speed transonic rotors. The first holographic approach used ruby laser light reflected from a portion of the centerbody just ahead of the rotor. These holograms showed the bow wave patterns upstream of the rotor and the shock patterns just inside the blade row near the tip. Much of the region of interest was in the shadow of the blade leading edge and could not be visualized. The second holographic approach, on a different rotor, used light transmitted diagonally across the inlet annulus past the centerbody. This approach gave a more extensive view of the region bounded by the blade leading and trailing edges, by the part span shroud and by the blade tip. These holograms showed the passage shock emanating from the blade leading edge and a moderately strong conical shock originating at the intersection of the part span shroud leading edge and the blade suction surface. Reasonable details of the shock patterns were obtained from holograms which were made without extensive rig modifications.
Document ID
19730023669
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Benser, W. A.
(NASA Lewis Research Center Cleveland, OH, United States)
Bailey, E. E.
(NASA Lewis Research Center Cleveland, OH, United States)
Gelder, T. F.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 2, 2013
Publication Date
January 1, 1973
Subject Category
Masers
Report/Patent Number
E-7622
NASA-TM-X-71430
Meeting Information
Meeting: Intern. Gas Turbine Conf
Location: Zurich
Country: Switzerland
Start Date: March 30, 1974
End Date: April 4, 1974
Sponsors: Am. Soc. of Mech. Engr.
Accession Number
73N32402
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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