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Aerofoil Performance Variability at Low Reynolds Numbers

机译：低雷诺数时的机翼性能差异

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The Eppler 61 (E61) Aerofoil has been found to be extremely sensitive to disturbances at low test Reynoldsrnnumbers. Different institutions investigating this aerofoil report widely varying aerodynamic results obtained inrnsimilar facilities. Tests have been performed on the E61 in the Departments 2’ x 2’, open return, low turbulencernintensity tunnel, using a fast response strain gauge balance to measure lift and drag.rnAerofoil behaviour at low Reynolds numbers was found to be strongly influenced by the background acousticrnlevel and the presence of single-frequency tonal noise. This provides a new explanation for the variability inrntest results in different facilities reported by many investigators. Further, the response of the aerofoil to acousticrndisturbances was dominated by the wind tunnel acoustic response. This finding implies that the consequences ofrnacoustic disturbances at low Reynolds numbers will depend on the facility in which the aerofoil it is tested.rnThese findings also offer new opportunities for performance modification of UAV aerofoils by the use of selected noise inputs.
机译：发现Eppler 61（E61）机翼对低雷诺数下的干扰极为敏感。研究这种翼型的不同机构报告说，在类似的设施中获得的空气动力学结果差异很大。在E61的2'x 2'处，开放回程，低湍流强度管道中进行了测试，使用快速响应应变仪天平测量升力和阻力.rn发现在低雷诺数下的机翼性能受到强烈的影响。背景声级和单频音调噪声的存在。这为许多研究者报告的不同设施中的变异性检验结果提供了新的解释。此外，翼型对声学干扰的响应主要由风洞的声学响应决定。这一发现暗示，低雷诺数下的声波扰动的后果将取决于对其进行测试的机翼的设施。这些发现还为通过使用选定的噪声输入来改进无人机机翼的性能提供了新的机会。

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