ia The Leyland and Ford gas turbines are
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of the two-shaft type and incorporate variable nozzles between the two turbines to enable fuel consumption to be improved and to provide overrun braking power. I have heard that a gas turbine is produced in which a clutch connects the shafts of the turbines. Can you give any details of this unit?
AIn the General Motors GT-309 gas turbine
a power-transfer clutch is located between the shafts of the gas generator and power turbine. The clutch is of the hydraulically controlled multiple-disc type and is used to transmit power from the compressor shaft to the power-turbine shaft at part loads. It is said that this enables the turbine inlet temperature and efficiency to be maintained at the optimum level over a wide load/speed range And it is considered to be a more reliable method of improving part-load fuel economy than the use of variable nozzles.