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A Study on Aerodynamic Interference for Truss Braced Wing Configuration

Conference paper
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Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 680)

Abstract

Truss Braced Wing (TBW) is one of the most promising configurations for future single-aisle commercial aircraft. The additional strut and jury in TBW endow the structure with better stiffness and strength, which enables a wing with larger aspect-ratio, thinner thickness and smaller swept angle, and even equipped with laminar flow airfoil. Theoretically, TBW configuration has the advantage of higher lift-to-drag ratio. However, one of potential problems for TBW is that severe disturbance may exist at the junction of truss and wing, which will reduce the aerodynamic benefit of TBW. To deal with this issue, this paper investigates influence of truss geometry on aerodynamic characteristics by numerical simulations of CFD. The Reynolds-averaged Navier–Stokes (RANS) method with the S-A turbulence model is used to compute the aerodynamic force and observe flow phenomenon of TBW in flight speed of Mach 0.73. The simulation results show that the geometric parameters that have large impacts on the cross section shape around the junction tend to have greater influences on aerodynamic characteristics (The Cross Section in this paper represents the cross section of air flow tunnel between the wing and truss). To analyze the impact of cross section geometry at the junction on the interference drag, we introduce a specific term, namely ‘flow section compression ratio’ that is the decreased rate of the cross section area from the entrance to the throat. The analysis indicates that the transonic disturbance will be considerable weaken when the ‘flow section compression ratio’ around the junction is under 16%, and the drag due to transonic disturbance accounts for only about 25% of the total interference drag. In order to further decrease the interference drag at the junction, we also investigate influences of the cross section geometry and airfoil thickness at the junction on the profile drag. The results from this paper can be helpful for TBW configuration design.

Keywords

Truss braced wing Aerodynamics Interference drag Computational fluid dynamics 

Notes

Acknowledgements

This work is supported by National defense key discipline laboratory of advanced aircraft design technology, NUAA. Great gratitude giving to all the professors and companions of research group MDO305 for their help during the re-search. The authors also gratefully acknowledge the helpful comments and suggestions of the reviewers, which have improved the presentation.

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Copyright information

© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2021

Authors and Affiliations

  1. 1.College of Aerospace EngineeringNanjing University of Aeronautics and AstronauticsNanjingChina

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