Transitional operation characteristic of hydraulic deceleration system in New Type Turbofan Engine

Abstract

It is impossible, in the conventional turbofan engine technology, to make the core engine speed optimize, because the front fan is directly connected to the core turbine shaft. Pratt & Whitney have proposed the geared turbofan engine to reduce the front fan speed at higher core turbine speed. On the contrary, this paper prepare the axial flow type torque converter composed of the driver and the turbine wheels in place of the gearbox, and the characteristics are discussed under unsteady operating conditions. The turbine wheel whose tip ring equips with the front fan works acceptably in response to the driver wheel speed.