Advanced research is under way today at Pratt & Whitney to design an ultrahigh bypass turbofan engine, known as the advanced ducted engine, that will meet the airline's demands for higher thrust and more fuel-efficient engines, while at the same time reducing airport noise and emissions.
Ultrahigh bypass turbofans are engines that use a large fan at the front of the engine to force pressurized air around and through the engine.
This is critically important due to the necessity of reducing the weight and drag of the large-diameter nacelles associated with ultrahigh bypass engine designs.
Ultrahigh bypass engines that offer the benefits of lower noise and lower fuel consumption also present a difficult challenge to the aircraft designer.
The test program demonstrated that ultrahigh bypass large-diameter engines can be installed under advanced wings with no increase in aerodynamic interference drag relative to a conventional turbofan installation.
Ultrahigh bypass cycles optimize at relatively low fan-pressure ratios.
Variable-pitch ultrahigh bypass fans must be lightweight so that the engine weight is not unduly penalized.
Modern, highly reliable gear systems will become a proven component of ultrahigh bypass engines in the future.
Critical areas of interest are: thrust reverse through variable pitch, interaction of the variable-pitch fan and the core engine, full-scale acoustics, thrust increase potential of an ultrahigh bypass propulsor on a commercially certificated PW2040 core engine, as well as the associated fuel-consumption reduction and the mechanical integration compatibility of the variable-pitch mechanism and the fan-drive gear system.
If the demonstrator program is successful, it will establish technology readiness of a new generation of ultrahigh bypass geared turbofan engines.
A model of Pratt & Whitney's new ultrahigh bypass turbofan engine undergoes tests at simulated takeoff and landing conditions in an acoustic research tunnel at the United Technologies Research Center.
Ultrahigh bypass engines that offer the benefits of lower noise and lower fuel consumption present a difficult challenge to the aircraft designer.