| Abstract | This report describes a hybrid computer model of a novel gas turbine engine. The engine compressor casing co-rotates with the compressor rotor at a lower speed, and is geared to the output shaft, together with the power turbine. A reduction of output shaft speed, at fixed gas generator rotor speed, increases the compressor· relative speed, mass flow rate and pressure ratio, and the output power, so producing a steep torque-speed characteristic. The hybrid computer model simulates the thermodynamic and mechanical behaviour of the engine, so that engine design parameters can be easily changed, to permit selection of optimum values for any application. The model also permits dynamic performance of the engine to be studied. |
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