Aerodynamic Characteristics of a Magnetically Supported Circular Cylinder in Axial Flow
Aerodynamic Characteristics of a Magnetically Supported Circular Cylinder in Axial Flow
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磁力支撑圆柱轴流气动特性
DOI：
10.2322/jjsass.63.20
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
A. Tezuka
中科院分区：
文献类型：
--
作者：
Ryo Konomi;H. Sugiura;A. Tezuka
：使用磁悬浮和平衡系统对轴向 (cid:13) 流中 (cid:12) 粗细比为 1.68 的气缸的空气动力学特性进行了实验检查。还通过使用位于圆柱体后部的虚拟支架来估计支架支撑干扰。使用粒子图像测速法测量流（cid：12）场结构。后刺对雷诺数从 6 : 7 (cid:2) 10 4 到 1 : 9 (cid:2) 10 5 的阻力系数影响很小(cid:13)。此外，在整个测量范围内，阻力系数和底压系数与雷诺数的关系不大。另一方面，据透露，后刺使得 (cid:13)ow (cid:12) 场非轴对称。在有刺的情况下，圆柱体后部的流向速度随着与刺的距离的增加而变慢，而湍流强度则变得更强。在气缸侧表面附近观察到类似的特征。此外，在圆柱体后缘附近观察到垂直于自由流方向的湍流（cid：13）波动的高值。这表明后部刺痛对远离刺痛的(cid:13)流有更强的(cid:13)影响，并且影响向上游传播。
: Aerodynamic characteristics of a cylinder with a (cid:12)neness ratio 1.68 in axial (cid:13)ow were examined experi-mentally using a magnetic suspension and balance system. Sting support interferences were also estimated by use of a dummy sting located at the back of the cylinder. Flow (cid:12)eld structures were measured using particle image velocimetry. There were little in(cid:13)uences of the rear sting on a drag coefficient for the Reynolds numbers from 6 : 7 (cid:2) 10 4 to 1 : 9 (cid:2) 10 5 . In addition, over the entire measurement range, the drag and base pressure coefficient depended little on the Reynolds number. On the other hand, it was revealed that the rear sting made the (cid:13)ow (cid:12)eld non-axisymmetric. In the case with the sting, the streamwise velocity at the rear of the cylinder was a little slower with the distance from the sting, while the turbulence intensity became much stronger. The similar features were observed near the cylinder side surface. Furthermore, high values of the turbulent (cid:13)uctuation perpendicular to the freestream direction were observed near the trailing edge of the cylinder. It suggested that the rear sting had stronger in(cid:13)uences on the (cid:13)ow away from the sting and the effects spread upstream.