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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Rollup region of a turbulent trailing vortex issued from a blade with flow separation
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Rollup region of a turbulent trailing vortex issued from a blade with flow separation

机译：带有流动分离的叶片发出的湍流尾涡的累积区域

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This paper presents the results of an experimental investigation on the near field of a tip vortex generated by a blade at moderate incidence. The experiments were conducted at Xe = 15 000 and the boundary layer over the blade separated around midchord on the upper surface. Laser-Doppler measurements of the turbulent flow (Tu = 1.5%) were performed at various stations downstream of the blade. The three components of the mean velocity field and turbulent attributes were quantified at cross-planes, characterizing both the blade wake and the tip vortex structure. This allowed the analysis of the rollup and initial stages of decay of the lip vortex in the light of known theories and models. The axial velocity defect at the center of the vortex core evolved as x(-1) log x, without displaying any significant outgrowth imposed by the separated flow upstream. Momentum balances were also carried out at a station downstream to the conclusion of vortex rollup. The approximate axisymmetry of the now field in the trailing vortex was used to formulate the balances in a cylindrical coordinate system. Among other observations, it was seen that an adverse axial pressure gradient developed in the vortex core, which reinforced the tenacity of the axial velocity defect. In contrast, an area influenced by a favorable pressure gradient was found outside the core. (C) 2000 Elsevier Science Inc. All rights reserved. [References: 31]
机译：本文介绍了在中等入射角下由叶片产生的尖端涡旋近场的实验研究结果。实验在Xe = 15000进行，叶片上的边界层在上表面的中弦周围分离。在叶片下游的各个工位进行了湍流的激光多普勒测量（Tu = 1.5％）。在横切面上对平均速度场和湍流属性的三个分量进行了量化，以表征叶片尾流和叶尖涡结构。这使得可以根据已知的理论和模型来分析唇涡的累积和衰减的初始阶段。涡流中心处的轴向速度缺陷演变为x（-1）log x，而没有显示由上游分离流强加的任何明显增长。还在下游站进行了动量平衡以结束涡旋累积。尾随涡流中场的近似轴对称被用来制定圆柱坐标系中的平衡。在其他观察结果中，可以看到在涡流芯中出现了不利的轴向压力梯度，从而增强了轴向速度缺陷的韧性。相反，在堆芯外部发现了受有利压力梯度影响的区域。 （C）2000 Elsevier Science Inc.保留所有权利。 [参考：31]

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