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1. (WO2014197075) THRUST EFFICIENT TURBOFAN ENGINE

Pub. No.:    WO/2014/197075    International Application No.:    PCT/US2014/027105
Publication Date: Fri Dec 12 00:59:59 CET 2014 International Filing Date: Sat Mar 15 00:59:59 CET 2014
IPC: F02K 1/15
F02K 1/16
F02K 3/06
Applicants: UNITED TECHNOLOGIES CORPORATION
Inventors: SABNIS, Jayant
Title: THRUST EFFICIENT TURBOFAN ENGINE
Abstract:
A disclosed turbofan engine includes a gas generator section for generating a gas stream flow. A speed reduction device is driven by the power turbine. A propulsor section includes a fan driven by the power turbine through the speed reduction device at a second speed lower than the first speed for generating propulsive thrust as a mass flow rate of air through a bypass flow path. The fan includes a tip diameter greater than about fifty (50) inches and an Engine Unit Thrust Parameter ("EUTP") defined as net engine thrust divided by a product of the mass flow rate of air through the bypass flow path, a tip diameter of the fan and the first rotational speed of the power turbine is less than about 0.30 at a take-off condition.