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首页> 外文会议>AHS 59th Annual Forum Proceedings Vol.2; May 6-8, 2003; Phoenix, Arizona >THE INTERDEPENDENCE OF STRAINING AND Viscous DIFFUSION EFFECTS ON VORTICITY IN ROTOR FLOW FIELDS
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THE INTERDEPENDENCE OF STRAINING AND Viscous DIFFUSION EFFECTS ON VORTICITY IN ROTOR FLOW FIELDS

机译：应变和粘性扩散效应对转子流场涡度的相互依赖

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An experiment was performed in an attempt to quantify the interdependence of straining and viscous diffusion effects on the development of rotor tip vortices. The properties of the blade tip vortices were measured in the wake of a hovering rotor, and compared to the results for the case when the wake approached a solid boundary. The presence of the boundary forced the tip vortex filaments to strain or stretch, allowing the effects of this process on the tip vortex developments to be studied and measured relative to the baseline case. It is shown that vortex stretching begins to decrease the viscous core size and, when the strain rates become large, this can balance the normal growth in the vortex core resulting from viscous diffusion. A parsimonious model for the effects of vortex stretching based on the conservation laws was used to correct the measurements, which brought the results into agreement with what would be expected on the basis of viscous diffusion alone. A byproduct of the process of progressively stretching the vortex filaments allowed their properties to be measured to older wake ages than would otherwise have been possible. The measured results were used to compare with other vortex measurements, and to augment previous correlations in an attempt to develop a more general vortex model that would be suitable for use in a variety of aeroacoustic applications. A new model is suggested that combines the effects of diffusion and strain on the vortex core growth. The empirical coefficients of this model have been derived based on the best available results from many sources of both fixed-wing and rotating-wing tip vortex measurements.
机译：进行了一项实验，试图量化应变和粘性扩散效应对转子尖端涡流发展的相互依赖性。在盘旋的尾流中测量叶尖涡流的特性，并将其与尾流接近固体边界时的结果进行比较。边界的存在迫使尖端涡旋丝变形或拉伸，从而允许相对于基线情况研究和测量该过程对尖端涡旋发展的影响。结果表明，涡旋拉伸开始减小粘性核的尺寸，并且当应变率变大时，这可以平衡由粘性扩散导致的涡核的正常生长。使用基于守恒定律的涡旋伸展效应的简约模型来校正测量值，这使结果与仅基于粘性扩散的预期结果一致。逐渐拉伸涡流丝的过程的副产物使得可以测量其特性到比其他方式更老的唤醒年龄。测量的结果用于与其他涡旋测量进行比较，并增强先前的相关性，以尝试开发更通用的涡旋模型，该模型适用于多种航空声学应用。提出了一个新模型，该模型结合了扩散和应变对涡流核心生长的影响。该模型的经验系数是根据固定翼和旋转翼尖端涡旋测量的许多来源的最佳可用结果得出的。

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