Patent ID: 9624827
Date: 2017-04-18
CPC Classifications: F02C,F02K,F05D

Claim:
1. A turbofan engine comprising: a gas generator section for generating a gas stream flow with higher energy per unit mass flow than that contained in ambient air; a power turbine converting the gas stream flow into shaft power, the power turbine rotating at a first rotational speed; a speed reduction device driven by the power turbine; and a propulsor section including 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, wherein 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 0.15 at a take-off condition.