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首页> 外文会议>AHS Specialists Conference on Aeromechanics Design for Transformative Vertical Flight >A coupled RANS/lifting-line analysis for modelling the aerodynamics of distributed propulsion
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A coupled RANS/lifting-line analysis for modelling the aerodynamics of distributed propulsion

机译：用于建模分布式推进空气动力学的耦合RAN /升降线分析

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摘要

This work presents a method for modelling propellers in the elsA Computational Fluid Dynamics (CFD) code through body-force source terms. The source terms correspond to the momentum and energy imparted on the fluid by the propeller blades and blade loading is calculated by a lifting-line analysis. A coupling is implemented between the lifting-line analysis and the CFD solution. This coupling enables to capture the interaction between propeller and flowfield. The proposed method addresses the aerodynamic analysis of vehicles with distributed propulsion in which propulsion/airframe interaction is key to the overall vehicle performance. The method is validated on a typical configuration enabled by distributed propulsion: a propeller mounted on the leading edge of a wing tip. Reference results are obtained by solving a full-blown unsteady RANS problem with meshed propeller and rotating grids. The body-force approach captured the effect of the wing on the propeller loading. The effect of the propeller slipstream on the wing aerodynamics is captured with excellent agreement by the reference and body-force predictions. Compared to the unblown wing, lift is increased by 4% and lift-to-drag ratio is increased by 9%.
机译：该工作提出了一种通过体力源术语在ELSA计算流体动力学（CFD）代码中建模螺旋桨的方法。源术语对应于通过螺旋桨叶片在流体上施加的动量和能量，并且通过升降线分析计算叶片载荷。在提升线分析和CFD溶液之间实现耦合。该耦合可以捕获螺旋桨和流场之间的相互作用。所提出的方法解决了具有分布推进的车辆的空气动力学分析，其中推进/机身相互作用是整体车辆性能的关键。该方法在分布式推进器启用的典型配置上验证：安装在机翼尖端的前缘上的螺旋桨。通过求解具有网状螺旋桨和旋转网格的全吹的非定常的RANS问题来获得参考结果。体力接近捕获机翼对螺旋桨装载的影响。通过参考和体力预测，捕获螺旋桨滑动对机翼空气动力学的影响。与未布局的翼相比，升力增加4％，升力比率增加了9％。

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