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Aerodynamics Series

2019년 1월 10일 목요일

Boeing's New Truss-Braced Wing

Boeing released their new aircraft having Truss-Braced wing type

 Actually, Boeing already have own experience related to the joint wing as described in this blog

 This E-X concept is more radical than the Truss-Braced type, and type category of joint-wing is shown below [1]

Fig. 2. Type of Joint-Wing [1]

 Although there were several prototype attempt to materialize joint wing (,4963.75.html), Boeing's one is interesting that there is no project like this in recent years. Boeing emphasized this project focuses fuel saving and noise reduction. From the reference [1], it might cause non-linear problem for the aerodynamic and stability perspective. 

 Complexity of the wing shape is caused by tandem configuration of the wing and joint-part generating complex flow configuration while aero-elastic problem also should be considered.. 

Fig. 3. Pressure distribution of the joint wing and its optimized shape [1]

 Optimized shape of Truss-Braced wing could achieve higher L/D and more payload than conventional shape as described in Fig. 4 [1]. L/D is increased from 26 to 32 however, increase of structure weight is significant. Finally, Boeing current concept is very similar to that of Fig. 5, class of mid-range airliner cruising at transonic speed. Anyway, it is interesting to watch the development of the old-new concept. 

Fig. 4. Optimized shape of Braced-wing [1]

Fig. 5. Optimized shape of Braced-wing similar to Boeing's current concept [1]

[1] Cavallaro, R and Demasi, L., 2016, Challenges, Ideas, and Innovations of Joined-Wing Configurations : A Concept from the Past , an Opportunity for the Future, Progress in Aerospace Sciences

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