propfan

(redirected from Open rotor)

propfan

[′präp‚fan]
(aerospace engineering)
An advanced turboprop with very thin, highly swept blades to reduce both compressibility losses and propeller noise during high-speed cruise.

propfan

propfan
An advanced propeller for use at high Mach numbers. It has six to twelve blades. The sweeping of the blade delays the critical Mach number (Mcrit) and reduces the noise from the tips of the blades. The sweep also alters the phase of the noise generated by each radial section along the blade, causing a certain amount of interference. This results in noise reduction. A propfan can be used either as a pusher or a tractor.
References in periodicals archive ?
Objective: "Tests will be performed on a full model provided with installed Counter Rotating Open Rotor (CROR) engines.
Washington, May 28 ( ANI ): Two aircraft engine concepts, geared turbofan and open rotor, can enable a significant reduction to aircraft fuel consumption.
Pratt and Rolls planned to hold an equal share in the venture, which was intended to study geared turbofan and open rotor technology along with other types of engine configurations.
The cutting chamber has three or five knives on an open rotor with a scissor cutting action against the two standard bed knives.
Among the improvements included in the space-age design - which looks like something off Thunderbirds - will be a geared open rotor engine with new materials as well as new airframe and systems architecture.
Designed for high speed, medium inertia with an open rotor cylinder, and 2, 3 or 5 hardened steel rotating knives, the company's granulator unit can process material down to 80 mesh up to 2" in size.
The Series has a low-speed, three-knife open rotor design, with rotating end disks for low-heat granulation and reduced friction wear.
This mill features 16 rows of sectional rotor knives and up to nine bed knives and an open rotor design, which results in a less restricted cooling airflow through the mill.
31 million spindles ring spinning machines and 136,256 rotors open end machines (converting rotor into conventional spindles in the ratio of open rotor to 3 spindles as in December 1994.
The Pratt & Whitney P1000G Geared Turbo Fan powering the CSeries (and Airbus NEO program) has the ability to further cut fuel consumption dramatically by 2020 (when Boeing currently is talking about a new airplane) and 2027 (when Airbus is currently talking about a new airplane), pre-empting the prospect of a more complete open rotor engine concept.
The partnership will focus on high-bypass ratio geared turbofan technology and the companies will collaborate on future studies for next generation propulsion systems, including advanced geared engines, open rotor technology and other advanced configurations.
Depending on the size, the granulator's cutting chamber features three or five knives on an open rotor.