Title: Design of adaptive transonic laminar airfoils using the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi>γ</mml:mi><mml:mtext>-</mml:mtext><mml:msub><mml:mrow><mml:mover accent="true"><mml:mrow><mml:mi mathvariant="italic">Re</mml:mi></mml:mrow><mml:mrow><mml:mo stretchy="false">˜</mml:mo></mml:mrow></mml:mover></mml:mrow><mml:mrow><mml:mi>θ</mml:mi><mml:mi>t</mml:mi></mml:mrow></mml:msub></mml:math>transition model
Abstract: This paper examines the design of adaptive laminar airfoils in the transonic flow regime using the γ-Re˜θt model as a transition prediction method. A robust solution procedure for the transition model is described and a grid convergence study is presented. Predictions from the model are then compared to an extensive set of experimental results containing transition measurements on a morphing airfoil. It is shown that the sensitivity of the γ-Re˜θt transition model with respect to shape variations allows its use in a design framework. Using a multi-point optimization strategy, the model is then used to design transonic airfoils suitable for a range of flow conditions. The potential improvement in drag associated with the implementation of adaptive airfoil technology is then carefully quantified using single-point optimization with the multi-point designed airfoil as a reference. Structural design constraints are taken into account to obtain a realistic estimate of possible drag reduction through airfoil morphing using current wing construction technology. Airfoil drag improvements of up to 4.6% are obtained through morphing of the section of upper surface located between the wing spars with respect to the baseline multi-point design in flow conditions typical of large business jet operation.
Publication Year: 2015
Publication Date: 2015-07-04
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 23
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