Russian aerodynamicists at the Central Aerohydrodynamic Institute (TsAGI) are studyingan unusual design concept that they say can cut fuel burn by as much as 10%.
Russian TsAGI: Spinning the fuselage to save fuel
By John Croft on September 14, 2011 in Uncategorised
In an 8September press release, TsAGI shows a picture of the “fuselage in the form of a rotating body with a tail propeller” in the institute’s low-speed wind tunnel, where air speed, angle of attack and sideslip angles as well as engine power settings were varied for the work.
The shape of the body, when rotated, apparently causes an aerodynamic interaction with the pusher propeller that reduces the torque needed by the driveshaft to turn the propeller.
TsAGI explains: “As a result of the tests, scientists have identifiedthe presence of positive aerodynamic interference, which manifests itselfas a drop in the required power of the shaft which drives the propeller to create thrust, compensating for the resistance of the rotating body, located in front of the propeller.”
The net result? “Thanks to a reduction in the required propulsion capacity, fuel consumption the aircraft may be reduced by 8-10%,” says TsAGI.