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TECHNICAL PAPERS

A New Tailpipe Design for GE Frame-Type Gas Turbines to Substantially Lower Pressure Losses

[+] Author and Article Information
Richard Golomb, Vivek Sahai, Dah Yu Cheng

Cheng Fluid Systems, Mountain View, CA 94040

J. Turbomach 125(1), 128-132 (Jan 23, 2003) (5 pages) doi:10.1115/1.1515335 History: Received October 09, 2001; Online January 23, 2003
Copyright © 2003 by ASME
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Figures

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A schematic of GE frame gas turbine showing the exhaust gas path and areas where large pressure losses occur
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Differences in flow behavior between (a) the current strut design, and (b) new strut design. The inlet conditions represent full speed full load operation. The turbulence caused by the current design leads to large pressure losses and removes the swirl that leads to large pressure losses downstream of the struts.
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When water flows through an elbow, separation and turbulence occur. Using specially designed vanes to pre-rotate the fluid, the fluid negotiates the turn with all streamlines traveling in equal flow paths.
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In a plain elbow with air flowing through, a skewed velocity profile results at the exit. With pre-rotation vanes, there is a flat velocity profile.
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Without cones in a large expansion, significant back mixing occurs with a high velocity jet in the center. With overlapping concentric cones, the velocity profile through the expansion becomes uniform.
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This is a schematic of a new tailpipe design that fits within the current space of the old design shown in Fig. 1. The struts will be modified to the new shape shown in Fig. 2. Downstream of the struts the wall and turning vanes will be replaced with an elbow.

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