Interferometric Measurements in a Turbine Cascade Using Image-Plane Holography

[+] Author and Article Information
P. J. Bryanston-Cross, T. Lang

The Advanced Research Laboratories, Rolls-Royce Ltd., Derby, U.K.

M. L. G. Oldfield, R. J. G. Norton

Department of Engineering Science, Oxford University, Oxford, U.K.

J. Eng. Power 103(1), 124-130 (Jan 01, 1981) (7 pages) doi:10.1115/1.3230683 History: Received December 17, 1979; Online September 28, 2009


A holographic technique used to produce image plane interferograms with white light reconstruction is described. This was used to study the transonic flow in a passage of a turbine stator cascade at a typical Reynolds number, Mach number, and free stream to blade surface temperature ratio. Both absolute holographic interferograms (fringes of constant flow density) and differential holographic interferograms (changes of density in 100 μsecs) are presented showing fine details in the boundary layer flow, trailing edge shocks, and wake structure. By counting the fringes on the interferograms, the free stream and surface Mach numbers and boundary layer temperature gradients can be determined.

Copyright © 1981 by ASME
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