Three-Dimensional Navier–Stokes Analysis and Redesign of an Imbedded Bellmouth Nozzle in a Turbine Cascade Inlet Section

[+] Author and Article Information
P. W. Giel, J. R. Sirbaugh

NYMA, Inc., NASA Lewis Research Center, Brook Park, OH 44142

I. Lopez

U.S. Army Research Laboratory, Vehicle Propulsion Directorate, Lewis Research Center, Cleveland, OH 44135

G. J. Van Fossen

NASA Lewis Research Center, Internal Fluid Mechanics Division, Cleveland, OH 44135

J. Turbomach 118(3), 529-535 (Jul 01, 1996) (7 pages) doi:10.1115/1.2836699 History: Received February 11, 1994; Online January 29, 2008


Experimental measurements in the inlet of a transonic turbine blade cascade showed unacceptable pitchwise flow nonuniformity. A three-dimensional, Navier–Stokes computational fluid dynamics (CFD) analysis of the imbedded bellmouth inlet in the facility was performed to identify and eliminate the source of the flow nonuniformity. The blockage and acceleration effects of the blades were accounted for by specifying a periodic static pressure exit condition interpolated from a separate three-dimensional Navier–Stokes CFD solution of flow around a single blade in an infinite cascade. Calculations of the original inlet geometry showed total pressure loss regions consistent in strength and location to experimental measurements. The results indicate that the distortions were caused by a pair of streamwise vortices that originated as a result of the interaction of the flow with the imbedded bellmouth. Computations were performed for an inlet geometry that eliminated the imbedded bellmouth by bridging the region between it and the upstream wall. This analysis indicated that eliminating the imbedded bellmouth nozzle also eliminates the pair of vortices, resulting in a flow with much greater pitchwise uniformity. Measurements taken with an installed redesigned inlet verify that the flow nonuniformity has indeed been eliminated.

Copyright © 1996 by The American Society of Mechanical Engineers
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