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TECHNICAL PAPERS: Gas Turbines: Cycle Innovations

Engine Performance Improvement by Controlling the Low Pressure Compressor Working Line

[+] Author and Article Information
Dan Martis

 Rolls-Royce Canada, 9545 Cote-de Liesse, Dorval, Quebec, H9P 1A5, Canadadan.martis@rolls-royce.com

Arthur Rowe

 Rolls-Royce Civil, Moor Lane, Derby, DE24 8BJ, United Kingdomarthur.rowe@rolls-royce.com

Brian Price

 Rolls-Royce Canada, 9545-Cote-de Liesse, Dorval, Quebec, H9P 1A5, Canadabrian.price@rolls-royce.com

Darryl Edwards

 Rolls-Royce Canada, 9545-Cote-de Liesse, Dorval, Quebec, H9P 1A5, Canadadarryl.edwards@rolls-royce.com

Vincent Perez

 Rolls-Royce Canada, 9545-Cote-de Liesse, Dorval, Quebec, H9P 1A5, Canadavincent.perez@rolls-royce.com

Marie-Laure Pinquier

6A Rue des Carrières, Essert, France 90850marielaurepinquier@hotmail.com

Samer Mhana

 Rolls-Royce Canada, 9545 Cote-de Liesse, Dorval, Quebec, H9P 1A5, Canadasamer.mhana@rolls-royce.com

Nicholas J. Papaconstantinou

 Rolls-Royce Canada, 9545 Cote-de Liesse, Dorval, Quebec, H9P 1A5, Canadanick.papaconstantinou@Rolls-Royce.com

J. Eng. Gas Turbines Power 129(3), 755-760 (Nov 13, 2006) (6 pages) doi:10.1115/1.2718229 History: Received May 05, 2006; Revised November 13, 2006

The new algorithm provides closed-loop control of the LP compressor working line in such a way as to maintain compressor stability and to provide increased power from the engine at the same firing temperature. This method is intended for the Trent 60, an aeroderivative engine designated for power generation and mechanical drive applications. The power benefit is achieved by operating at higher LPC pressure ratio and thereby increasing the inlet air flow and overall pressure ratio of the engine. Since the algorithm controls the working line, the threats to compressor stability related to the working line level are removed (including production scatter, deterioration, and fouling) and the required surge margin can be safely reduced, providing a significant benefit in engine performance. The paper presents comparatively the structure of the current and new concepts, the main features of the controller, and stresses the improved accuracy and reliability of new algorithms. The performance benefit is then assessed; the increase in power is about 3% at ISO, sea level conditions and varies with ambient temperature.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Comparison between aero and industrial Trent

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Figure 2

Generic characteristic of a LPC running at constant speed; the compressor is assisted by fully modulated BOV and VIGV

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Figure 3

LPBOV and LPVIGV schedule versus power for a new and clean engine

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Figure 4

LPBOV and LPVIGV overlapping schedules-deteriorated engine

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Figure 5

LP compressor generic surge margin stack-up with and without LPVIGV optimization

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Figure 6

LPC working line level with optimized LPVIGV position

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Figure 7

Improved BOV and VIGV schedule by applying the new logic

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Figure 8

New controller with closed-loop on LPC pressure ratio

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Figure 9

Speed line drift for a deteriorated engine

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Figure 10

Static-to-total pressure ratio characteristic compared to total pressure ratio characteristic

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Figure 11

Power benefit for Trent 60–50Hz

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Figure 12

Power benefit in percents for Trent 60–50Hz

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Figure 13

Power benefit for Trent 60–60Hz

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Figure 14

Power benefit in percents for Trent 60–60Hz

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