Toward Designing with Three-Dimensional Bumps for Lift/Drag Improvement and Buffet Alleviation

The desire to design more efficient transport aircraft has led to many different attempts to minimize drag. One approach is the use of three-dimensional shock control bumps, which have gained popularity in the research community as simple, efficient and robust devices capable of reducing the wave dr...

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Bibliographic Details
Published in:AIAA journal 2012-12, Vol.50 (12), p.2882-2898
Main Authors: Eastwood, Jeremy P, Jarrett, Jerome P
Format: Article
Language:English
Subjects:
Aerodynamics
Applied fluid mechanics
Computational methods in fluid dynamics
Drag
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
General theory of fields and particles
Mathematical analysis
Mathematical models
Parametrization
Physics
The physics of elementary particles and fields
Three dimensional
Two dimensional
Wings (aircraft)
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Summary:The desire to design more efficient transport aircraft has led to many different attempts to minimize drag. One approach is the use of three-dimensional shock control bumps, which have gained popularity in the research community as simple, efficient and robust devices capable of reducing the wave drag of transonic wings. This paper presents a computational study of the performance of three-dimensional bumps, relating key bump design variables to the overall wing aerodynamic performance. An efficient parameterization scheme allows three-dimensional bumps to be directly compared to two-dimensional designs, indicating that two-dimensional bumps are capable of greater design point aerodynamic performance in the transonic regime. An advantage of three-dimensional bumps lies in the production of streamwise vortices, such that, while two-dimensional bumps are capable of superior performance near the design point, three-dimensional bumps are capable of breaking up regions of separated flow at high Mach numbers, suggesting improvement in terms of buffet margin. A range of bump designs are developed that exhibit a tradeoff between design point aerodynamic efficiency and improvement in buffet margin, indicating the potential for bespoke designs to be generated for different sections of a wing based on its flow characteristics.
ISSN:0001-1452
1533-385X
DOI:10.2514/1.J051740