Aerothermodynamic Performance of a Variable Nozzle Power Turbine Stage for an Automotive Gas Turbine

[+] Author and Article Information
E. H. Razinsky, W. R. Kuziak

Power Systems Department, General Motors Research Laboratories, Warren, Mich.

J. Eng. Power 99(4), 587-592 (Oct 01, 1977) (6 pages) doi:10.1115/1.3446555 History: Received December 26, 1976; Online July 14, 2010


Test results are presented for the GT-225 variable-nozzle power turbine with nozzles set at reduced, design, and increased areas and in the braking position. Comparisons are made between predicted and experimental results. At a given speed and output power, the turbine is more efficient at the design nozzle area than when area is reduced. It is shown, however, that the GT-225 engine exhibits improved part-load specific fuel consumption due to the ability to run at higher gasifier turbine inlet temperatures afforded by the variable nozzle power turbine. With the nozzles in the braking position and the gasifier turbine at idle speed, peak engine braking power is 27 percent of the maximum positive power. Measurements at the turbine discharge show that total pressure profiles are dependent on nozzle area. There is a performance penalty associated with the vane-end clearance required for movement of the variable nozzles. Tests conducted with the nozzles in the design position and with their vane-ends sealed yielded efficiency improvements of 0.7–4.0 percentage points.

Copyright © 1977 by ASME
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