This paper describes the research activities conducted hy the European Research consortium HELIFUSE during the first vear of this Brite-EuRaM uroiect. The work consisted of Navier-Stokes comnutatinns on nre-selected test cases taken . " out of a n extensive wind tunnel test program a t the ONERA F l wind tunnel. The calculations were performed by three national research institutes (CIRA, DLR, ONERA), three helicopter manufacturers (Agusta, Eurocopter, GKN-Westland), one software company (Sirnulog) and two universities (DTU, IAG). The aim of the work was to simulate the complex Rowfield around the fuselage of the wind tunnel tests. Rlind test calculations and wind tunnel data were in very good agreement for the surface pressure distribution, hut showed some discrepancies in the drag prediction accuracy. I n order to understand the reasons for this scatter, two additional computational tests were performed: 1) computation of a fuselage test case with one Navier-Stokes code on all the different structured grids; 2) computations by all the structured Navier-Stokes codes on one common grid. These results have reduced the large scatter in the drag data from CFD analysis, although some discrepancy still exists.
The first prototype SA340 flew the 7th of April 1967 initially with a conventional tail rotor. The initial Fenestron® patents of Mouille and Bouquardez, were quickly followed by the first flight on the Gazelle prototype. In early 1968 the second prototype flew with the Fenestron®. There are more than 5200 helicopters that are flying today with this anti torque concept.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.