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首页> 外文期刊>The Aeronautical Journal >On the vortex created by multiple blades joined at a hub
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On the vortex created by multiple blades joined at a hub

机译：在由连接在轮毂上的多个叶片产生的涡流上

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摘要

Experimental studies often use several blades, joined on the centreline, to generate a vortex in a wind tunnel. The circulation profile of this vortex is non-trivial, and a rapid prediction method will facilitate the design of such devices. Prompted by an experiment of Beninati and Marshall, such a model was derived. It assumes a large number of narrow blades and small turning angles, and rests on a balance of angular momentum and on simple aerofoil function. It is claimed to be valid even close to the centreline, can be completed analytically, contains no adjustable constants, and agrees well with two experiments although the turning angle reached 16° and the devices only had two or four blades. With typical geometries, the interference between blades makes the circulation profile quite different from that behind an elliptically-loaded wing, prompting some doubt over the relevance of such a vortex to those trailing real wings.
机译：实验研究通常使用几个连接在中心线上的叶片在风洞中产生涡流。该涡旋的循环分布是很重要的，快速预测方法将有助于这种装置的设计。通过贝尼纳蒂和马歇尔的实验，得出了这样的模型。它假定有许多狭窄的叶片和较小的转角，并且依赖于角动量和简单的机翼功能的平衡。它声称即使在中心线附近也是有效的，可以分析完成，不包含可调整的常数，并且尽管转角达到16°并且设备只有两个或四个叶片，但与两个实验非常吻合。对于典型的几何形状，叶片之间的干扰使环流轮廓与椭圆形机翼后面的环流轮廓大不相同，这使人们对这种涡流与尾随真实机翼的相关性产生了怀疑。

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