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Aerodynamic Optimization Trade Study of a Box-Wing Aircraft Configuration

机译：箱式翼飞机配置的气动优化贸易研究

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摘要

This study investigates the aerodynamic tradeoffs of a box-wing aircraft configuration using high-fidelity aerodynamic optimization. A total of five optimization studies are conducted, where each study extends the previous one by progressively adding a combination of design variables and constraints. Examples of design variables include wing twist and sectional shape; examples of constraints include trim and stability requirements. In all cases, the objective is to minimize inviscid drag at a prescribed lift and a Mach number of 0.78. Aerodynamic functionals are evaluated based on the discrete solution of the Euler equations, which are tightly coupled with an adjoint methodology incorporating a gradient-based optimizer. For each study, an equivalent conventional tube-and-wing baseline is similarly optimized in order to enable direct comparisons. It is found that the transonic box-wing aircraft considered here, for which the height-to-span ratio is about 0.2, produces up to 43% less induced drag than its conventional counterpart. This larger than expected benefit is attributed to the unique capability of the box wing to redistribute its optimal lift distribution, as it enables trim and other constraints to be satisfied with almost no performance degradation. The impact of nonlinear aerodynamics on the box wing is explored further through a series of subsonic
机译：本研究使用高保真空气动力学优化技术研究了箱形翼飞机配置的空气动力学权衡。总共进行了五项优化研究，其中每项研究通过逐步添加设计变量和约束的组合来扩展前一项研究。设计变量的示例包括机翼扭曲和截面形状；约束的示例包括调整和稳定性要求。在所有情况下，目标都是在规定的升力和0.78的马赫数下，将无粘性阻力降至最低。基于欧拉方程的离散解来评估空气动力学功能，该方程与结合了基于梯度的优化器的伴随方法紧密耦合。对于每项研究，都对等效的常规管和翼基线进行了类似的优化，以便进行直接比较。已经发现，此处考虑的跨音速箱翼飞机的高度与跨度比约为0.2，与传统的同类飞机相比，其产生的阻力降低了多达43％。大于预期的收益归因于箱形翼重新分配其最佳升力分布的独特能力，因为它可以在不降低性能的情况下满足修剪和其他约束。通过一系列亚音速进一步探讨了非线性空气动力学对箱形机翼的影响

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  • 来源
    《Journal of Aircraft》 |2016年第4期|971-981|共11页
  • 作者

    Gagnon Hugo; Zingg David W.;

  • 作者单位

    Univ Toronto, Inst Aerosp Studies, Toronto, ON M3H 5T6, Canada|NUMECA Int, Chaussee de la Hulpe 189, B-1170 Brussels, Belgium;

    Univ Toronto, Inst Aerosp Studies, Toronto, ON M3H 5T6, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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