Validates Design And Fuel Efficiency On Cseries Aircraft
By Shane Nolan
November 7, 2011 - Bombardier Aerospace confirmed that
final results of a three-phase wind tunnel test program
provided further validation of the CSeries aircraft’s
aerodynamic design. They also support design predictions
that the CSeries aircraft, optimized specifically for
the growing 100- to 149-seat market, will deliver a
step-change in fuel efficiency.
The wind tunnel tests also contributed to the
achievement of optimal integration of Pratt & Whitney’s
ultra high-bypass ratio (12:1) PurePower® PW1500G
engine. Initiated more than five years ago, during the
early stages of the CSeries aircraft’s conceptual
design, the wind tunnel test program progressed through
the aircraft’s subsequent definition and detailed design
of the CSeries aircraft’s aerodynamic design included extensive
use of state-of-the-art Computational Fluid Dynamics (CFD), made
possible through the use of contemporary super-computers that
are significantly more capable and 100,000 times faster than
computers available when the aircraft currently serving the 100-
to 149-seat market were designed. These tools permitted the
minimization of interference drag and also facilitated the
design of the engine nacelle and thrust reverser.
simulate actual flying conditions, the wind tunnel tests were
conducted with over 20 sophisticated scale models over more than
4,500 testing hours at facilities in Canada, France, Germany,
the Netherlands, the United Kingdom and the United States.
“This latest achievement for the CSeries aircraft represents the most extensive and complex wind tunnel testing that Bombardier has ever conducted; it marks another key advance in the jetliner’s development.” The scale models of the CSeries jetliner used in the testing were equipped with precise instrumentation to measure air flow, including as many as 700 pressure-sensitive ports over the wings, fuselage and tail.
included moving parts, such as wing flaps and leading edge
slats, which could be repositioned to reflect actual flying
events. Some models were equipped with miniature air-driven
turbine engines to gauge the air flow interference with the
aircraft wings. The largest of the models, at 13.7 per cent
scale, had a wingspan of approximately 4.5 metres (15 feet).
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