Characteristics of Transient Vortices in the Boundary Layer on a Rotating Disk under Orbital Motion  

作　　者：Mizue Munekata Naoya Jobi Keiichiro Kubo Hiroyuki Yoshikawa 

机构地区：[1]Department of Mechanical System Engineering,Kumamoto University

出　　处：《Journal of Thermal Science》2013年第6期600-605,共6页热科学学报（英文版）

基　　金：supported by the Harada Memorial Foundation and a Grant-in-Aid for Scientific Research (No. 24560202) from the Japan Society for the Promotion of Science

摘　　要：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 i-0.025, the interval of transient vortices depends on only the orbital radius, regardless of the directions of rota- tion 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 in- creased velocity. Consequently, no vortices generated on a rotating disk under orbital motion are stationary rela- tive to the disk.

关 键 词：Boundary layer transition Transient vortex Rotating disk Velocity measurement Hot-wire ane-mometer 

分 类 号：P414.7[天文地球—大气科学及气象学]