Effect of fineness ratios of 0.75–2.0 on aerodynamic drag of freestream-aligned circular cylinders measured using a magnetic suspension and balance system
Effect of fineness ratios of 0.75–2.0 on aerodynamic drag of freestream-aligned circular cylinders measured using a magnetic suspension and balance system
复制标题
使用磁悬浮和平衡系统测量的 0.75-2.0 细度比对自由流排列圆柱体气动阻力的影响
DOI：
10.1007/s00348-018-2531-2
复制
发表时间：
2018
影响因子：
2.4
通讯作者：
H. Sawada
中科院分区：
文献类型：
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作者：
T. Nonomura;Kei Sato;Keita Fukata;Hayato Nagaike;Hiroyuki Okuizumi;Y. Konishi;K. Asai;H. Sawada
利用磁悬浮天平（MSBS）对长细比为0.75-2.0的自由流圆柱体的阻力系数进行了实验研究。其目的是找到临界几何形状，即在该比率范围内阻力系数成为局部最大值的细度比。实验是在东北大学流体科学研究所的低湍流度风洞中使用1-m MSBS进行的。测量了各种圆柱的阻力系数和底压系数。改变自由落体速度以产生雷诺数从到的流动。阻力系数随着长细比的增加而单调减小，在我们研究的范围内没有发现临界几何形状或阻力系数的局部最大值。底压系数随长细比的增大而减小。长细比为0.75、1.0和1.2的模型的基压的时间波动大约是长细比为2.0的模型的两倍。长细比和阻力系数之间的关系与长细比和底压系数之间的关系相似，这与以前二维物体研究的结果相似。
The drag coefficients of freestream-aligned circular cylinders of fineness ratios of 0.75–2.0 were investigated with a magnetic suspension and balance system (MSBS). The objective was to find the critical geometry, that is, the fineness ratio at which the drag coefficient becomes the local maximum within this ratio range. The experiments were conducted using the 1-m MSBS at the low turbulence wind tunnel at the Institute of Fluid Science, Tohoku University. The drag and base pressure coefficients of various cylinders were measured. The freestream velocity was varied to produce flows with Reynolds numbers ranging fromto. The drag coefficient monotonically decreases as the fineness ratio increases and no critical geometry or local maximum of the drag coefficient is found in the range we investigated. The base pressure coefficient decreases as the fineness ratio increases. The temporal fluctuations of the base pressure of the models with fineness ratios of 0.75, 1.0, and 1.2 are approximately twice as large as that of the model with a ratio of 2.0. The relationship between the fineness ratio and the drag coefficient is similar to that between the fineness ratio and the base pressure coefficient, similar to the findings of previous studies of two-dimensional bodies.