Impingement Starting and Power Boosting of Small Gas Turbines

[+] Author and Article Information
C. Rodgers

Chief Analytical Engineer, Turbomach Division of Solar Turbines, Inc., San Diego, Calif. 92123

J. Eng. Gas Turbines Power 107(4), 821-827 (Oct 01, 1985) (7 pages) doi:10.1115/1.3239817 History: Received January 12, 1984; Online October 15, 2009


The technology of high-pressure air or hot-gas impingement from stationary shroud supplementary nozzles onto radial outflow compressors and radial inflow turbines to permit rapid gas turbine starting or power boosting is discussed. Data are presented on the equivalent turbine component performance for convergent/divergent shroud impingement nozzles, which reveal the sensitivity of nozzle velocity coefficient with Mach number and turbine efficiency with impingement nozzle admission arc. Compressor and turbine matching is addressed in the transient turbine start mode with the possibility of operating these components in braking or reverse flow regimes when impingement flow rates exceed design.

Copyright © 1985 by ASME
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