錐形圓柱低雷諾數尾流之特性實驗研究

Experimental Study on the Wake of Tapered Circular Cylinder at Low Reynolds Numbers

王安邦(An-Bang Wang) ； 王炫証(Hsuan-Cheng Wang)

《中國航空太空學會學刊》 30卷1期 (1998/03) Pp. 61-67

https://doi.org/10.6124/TAASRC.199803_30(1).07

摘要

The major purpose of this paper is to study the phenomena of wake flow of tapered cylinders at Reynolds number below 200. It is found in this work that there are two constant frequency wake regions at each end of the tapered cylinder. In-between is a transitional region. The shedding frequencies of the tapered cylinder are lower than the corresponding two-dimensional cylinder. It is revealed in this paper that end plates of the tapered cylinder may lower the measured shedding frequency at both ends. The flow character around the small end has more influence on the wake character of the tapered cylinder in the transition region. This mechanism increases the critical Reynolds number of the tapered cylinder if the small end has no shedding.

關鍵字

錐形圓柱 ； 渦漩剝離 ； 邊端效應

並列摘要

The major purpose of this paper is to study the phenomena of wake flow of tapered cylinders at Reynolds number below 200. It is found in this work that there are two constant frequency wake regions at each end of the tapered cylinder. In-between is a transitional region. The shedding frequencies of the tapered cylinder are lower than the corresponding two-dimensional cylinder. It is revealed in this paper that end plates of the tapered cylinder may lower the measured shedding frequency at both ends. The flow character around the small end has more influence on the wake character of the tapered cylinder in the transition region. This mechanism increases the critical Reynolds number of the tapered cylinder if the small end has no shedding.

並列關鍵字

Tapered circular cylinder ； vortex shedding ； end effects