Characteristics of Transient Vortices in the Boundary Layer on a Rotating Disk under Orbital Motion
Characteristics of Transient Vortices in the Boundary Layer on a Rotating Disk under Orbital Motion
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轨道运动下旋转圆盘边界层瞬态涡特征
DOI：
10.1007/s11630-013-0668-0
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发表时间：
2013
影响因子：
2.5
通讯作者：
Hiroyuki Yoshikawa
中科院分区：
文献类型：
--
作者：
Mizue Munekata;Naoya Jobi;Keiichiro Kubo;Hiroyuki Yoshikawa
这项研究的目的是通过实验研究同时经历旋转和轨道运动的圆盘边界层中的瞬变涡流特性。用热线法测量了旋转、绕轨道运行的圆盘(圆盘半径等于轨道半径)上的速度脉动，考察了轨道运动对边界层内瞬变涡的影响。当轨道速度与自转速度之比为±0.025时，瞬变旋涡的间隔仅取决于轨道半径，而与自转方向和轨道运动无关。低频扰动的频率随着轨道速度的增加而增加，由这些低频扰动引起的涡旋在圆盘上传播，然后在速度增加的区域发展。因此，在轨道运动的旋转圆盘上产生的涡旋不会相对于圆盘是静止的。
The objective of this study is to experimentally examine the characteristics of transient vortices in the boundary layer on a disk undergoing both rotation and orbital motion. The velocity fluctuations on a rotating, orbiting disk (disk radius equal to orbital radius) are measured by the hot-wire method, and the effects of orbital motion on the transient vortices in the boundary layer are examined. When the ratio of the orbital speed to the speed of rotation is ±0.025, the interval of transient vortices depends on only the orbital radius, regardless of the directions of rotation and orbital motion. The rate of low-frequency disturbances increases as the orbital speed increases, and the vortices induced by these low-frequency disturbances travel over the disk and then develop in the region of increased velocity. Consequently, no vortices generated on a rotating disk under orbital motion are stationary relative to the disk.