1985-02-01

Some Performance Characteristics of a Gas Tribune Engine with Enhanced Torque Amplification at Part Speed 850031

A novel gas turbine engine, the Co-Turbo-shaft Engine, featuring a co-rotating compressor casing geared to the output shaft, has been proposed as a powerplant for heavy equipment applications because of its steep torque-speed curve. To evaluate the performance of this engine, it was modelled on a hybrid computer.
The οutput power and torque at fixed gas generator speed and reducing output speed was of main interest. It was found that the stall torque was about 3 times the design torque, while peak power was achieved at about 60% of design output shaft speed, and was up to 1157% of design power. A surprising result for a fixed geometry engine was that this increase in power was achieved with almost constant turbine inlet temperature.
A simplified analysis showed that turbine inlet temperature is controlled by three factors, two tending to increase the temperature and one decreasing it, as shaft speed drops.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 43% off list price.
Login to see discount.
Special Offer: With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.
X