The effects of aspect ratio (AR: opposite diameter to width) reduction on the total pressure loss distribution of horizontally arranged splitting airfoils are investigated experimentally and numerically. The array arrangement of airfoils is proposed as a novel distortion generator mechanism. The upgrade feasibility study of the single airfoil loss repeatability in combined pattern was the aim of the present research. Modification of 90° splitting airfoil as a representative of the airfoils category with was a corrective approach to eliminate or delay the downstream wake axis rotation destructive effects on the combined loss predictability. The results of the modified airfoil (single and multiple arrangements) wake simulations based on hybrid turbulence model demonstrate a good agreement with wind tunnel measurements. It was observed that the aspect ratio reduction below the limiting value of “1” for selected opening angle provides the quasi-2D behavior of downstream flow structure related to airfoil category along with relatively higher value of loss related to category. Elimination of the side separation for modified 90° airfoil and the resulting similarity of maximum loss lobes positioning in arrangement of airfoils lead to the reduction of combined flow structure complexity and the improvement of loss predictability. It has appeared that combined loss pattern of the triple arrangement of the airfoils can be reconstructed from dual arrangement, and it can be reproduced from a single pattern in a hierarchical process. Concerning the maximum loss coefficient “values,” an overprediction of velocity recovery rate was observed in simulation results at the fully developed wake region that led to approximately 15% lower maximum loss values in comparison with the experiments.

中文翻译：

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分离翼型的纵横比对失真发生器分离和损耗分布控制的影响

通过实验和数值研究了纵横比（AR：直径与宽度相反）减小对水平布置的分裂翼型的总压力损失分布的影响。提出了翼型的阵列布置作为一种新颖的变形发生器机构。本研究的目的是对组合型单翼损失重复性进行升级可行性研究。修改 90° 分裂翼型作为翼型类别的代表是一种纠正方法，用于消除或延迟下游尾流轴旋转对综合损失可预测性的破坏性影响。基于混合湍流模型的改进翼型（单排和多排）尾流模拟结果与风洞测量结果吻合良好。据观察，对于选定的张角，纵横比减小到“1”的极限值以下提供了与下游流动结构相关的准二维行为翼型类别以及与相关的相对较高的损失值类别。消除改进的 90° 翼型的侧向分离以及由此产生的翼型布置中最大损失叶定位的相似性导致组合流动结构复杂性的降低和损失可预测性的提高。已经出现了翼型的三重布置的组合损失模式可以从双重布置重构，并且可以从分层过程中的单一模式再现。关于最大损失系数“值”，在完全发展的尾流区域的模拟结果中观察到速度恢复率的过度预测，导致与实验相比，最大损失值降低了约 15%。