The Influence of Blade Wakes on the Performance of Interturbine Diffusers

[+] Author and Article Information
R. G. Dominy, D. A. Kirkham

School of Engineering, University of Durham, Durham, United Kingdom

J. Turbomach 118(2), 347-352 (Apr 01, 1996) (6 pages) doi:10.1115/1.2836649 History: Received February 18, 1994; Online January 29, 2008


Interturbine diffusers provide continuity between HP and LP turbines while diffusing the flow upstream of the LP turbine. Increasing the mean turbine diameter offers the potential advantage of reducing the flow factor in the following stages, leading to increased efficiency. The flows associated with these interturbine diffusers differ from those in simple annular diffusers both as a consequence of their high-curvature S-shaped geometry and of the presence of wakes created by the upstream turbine. It is shown that even the simplest two-dimensional wakes result in significantly modified flows through such ducts. These introduce strong secondary flows demonstrating that fully three-dimensional, viscous analysis methods are essential for correct performance modeling.

Copyright © 1996 by The American Society of Mechanical Engineers
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