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Numerical study of geometric morphing wings of the 1303 UCAV
The Aeronautical Journal ( IF 1.4 ) Pub Date : 2021-03-22 , DOI: 10.1017/aer.2021.15
B. Nugroho , J. Brett , B.T. Bleckly , R.C. Chin

Unmanned Combat Aerial Vehicles (UCAVs) are believed by many to be the future of aerial strike/reconnaissance capability. This belief led to the design of the UCAV 1303 by Boeing Phantom Works and the US Airforce Lab in the late 1990s. Because UCAV 1303 is expected to take on a wide range of mission roles that are risky for human pilots, it needs to be highly adaptable. Geometric morphing can provide such adaptability and allow the UCAV 1303 to optimise its physical feature mid-flight to increase the lift-to-drag ratio, manoeuvrability, cruise distance, flight control, etc. This capability is extremely beneficial since it will enable the UCAV to reconcile conflicting mission requirements (e.g. loiter and dash within the same mission). In this study, we conduct several modifications to the wing geometry of UCAV 1303 via Computational Fluid Dynamics (CFD) to analyse its aerodynamic characteristics produced by a range of different wing geometric morphs. Here we look into two specific geometric morphing wings: linear twists on one of the wings and linear twists at both wings (wash-in and washout). A baseline CFD of the UCAV 1303 without any wing morphing is validated against published wind tunnel data, before proceeding to simulate morphing wing configurations. The results show that geometric morphing wing influences the UCAV-1303 aerodynamic characteristics significantly, improving the coefficient of lift and drag, pitching moment and rolling moment.

中文翻译:

1303 UCAV几何变形机翼数值研究

许多人认为无人驾驶作战飞行器 (UCAV) 是空中打击/侦察能力的未来。这种信念导致波音幻影工厂和美国空军实验室在 1990 年代后期设计了 UCAV 1303。由于 UCAV 1303 预计将承担对人类飞行员有风险的广泛任务角色,因此它需要具有高度的适应性。几何变形可以提供这种适应性,并允许 UCAV 1303 在飞行中优化其物理特性,以增加升阻比、机动性、巡航距离、飞行控制等。这种能力非常有益,因为它将启用 UCAV协调相互冲突的任务要求(例如,在同一任务中徘徊和冲刺)。在这项研究中,我们通过计算流体动力学 (CFD) 对 UCAV 1303 的机翼几何形状进行了多次修改,以分析其由一系列不同机翼几何形状产生的空气动力学特性。在这里,我们研究了两个特定的几何变形机翼:一个机翼上的线性扭曲和两个机翼上的线性扭曲(冲入和冲出)。没有任何机翼变形的 UCAV 1303 的基线 CFD 已根据已发布的风洞数据进行验证,然后再继续模拟变形机翼配置。结果表明,几何变形机翼对UCAV-1303气动特性有显着影响,提高了升阻系数、俯仰力矩和横滚力矩。在这里,我们研究了两个特定的几何变形机翼:一个机翼上的线性扭曲和两个机翼上的线性扭曲(冲入和冲出)。没有任何机翼变形的 UCAV 1303 的基线 CFD 已根据已发布的风洞数据进行验证,然后再继续模拟变形机翼配置。结果表明,几何变形机翼对UCAV-1303气动特性有显着影响,提高了升阻系数、俯仰力矩和横滚力矩。在这里,我们研究了两个特定的几何变形机翼:一个机翼上的线性扭曲和两个机翼上的线性扭曲(冲入和冲出)。没有任何机翼变形的 UCAV 1303 的基线 CFD 已根据已发布的风洞数据进行验证,然后再继续模拟变形机翼配置。结果表明,几何变形机翼对UCAV-1303气动特性有显着影响,提高了升阻系数、俯仰力矩和横滚力矩。
更新日期:2021-03-22
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