A Study of Passage Flow through a Cascade of Turbine Blades Using Image Plane Holographic Interferometry,
OXFORD UNIV (ENGLAND) DEPT OF ENGINEERING SCIENCE
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A series of holographic interferograms is presented, showing the flow through two passages of a cascade of turbine rotor blades in the Oxford Isentropic Light Piston Tunnel with full-scale Reynolds numbers, Mach numbers and gas-to-wall temperature ratios. Using a previously described technique, double exposure absolute and differential image plane holograms were obtained of the complete flowfield under a range of conditions. The isodensity contours predicted by a timemarching throughflow calculation compare well with the positions of the interference fringe on the holograms. The intersections of these fringes with the blade surfaces give blade surface Mach numbers which agree well with those from surface pressure measurements. Wakes, shock waves, and the presence of upstream and side wall turbulence are all evident in the holograms.
- Fluid Mechanics