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NACA-TN-2913
On the development of turbulent wakes from vortex streets
Year: 1953
Abstract: Wake development behind circular cylinders at Reynolds numbers from 40 to 10,000 was investigated in a low-speed wind tunnel. Standard hot-wire techniques were used to study the velocity fluctuations.
The Reynolds number range of periodic vortex shedding is divided into two distinct subranges. At R = 40 to 150, called the stable range, regular vortex streets are formed and no turbulent motion is developed. The range R = 150 to 300 is a transition range to a regime called the irregular range, in which turbulent velocity fluctuations accompany the peiodic formation of vortices. The turbulence is initiated by laminarturbulent transition in the free layers which spring from the separation points on the cylinder. This transition first occurs in the range R = 150 to 300.
The Reynolds number range of periodic vortex shedding is divided into two distinct subranges. At R = 40 to 150, called the stable range, regular vortex streets are formed and no turbulent motion is developed. The range R = 150 to 300 is a transition range to a regime called the irregular range, in which turbulent velocity fluctuations accompany the peiodic formation of vortices. The turbulence is initiated by laminarturbulent transition in the free layers which spring from the separation points on the cylinder. This transition first occurs in the range R = 150 to 300.
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T15:20:11Z | |
| date available | 2017-09-04T15:20:11Z | |
| date copyright | 01/01/1953 | |
| date issued | 1953 | |
| identifier other | MVONEEAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/20055 | |
| description abstract | Wake development behind circular cylinders at Reynolds numbers from 40 to 10,000 was investigated in a low-speed wind tunnel. Standard hot-wire techniques were used to study the velocity fluctuations. The Reynolds number range of periodic vortex shedding is divided into two distinct subranges. At R = 40 to 150, called the stable range, regular vortex streets are formed and no turbulent motion is developed. The range R = 150 to 300 is a transition range to a regime called the irregular range, in which turbulent velocity fluctuations accompany the peiodic formation of vortices. The turbulence is initiated by laminarturbulent transition in the free layers which spring from the separation points on the cylinder. This transition first occurs in the range R = 150 to 300. | |
| language | English | |
| title | NACA-TN-2913 | num |
| title | On the development of turbulent wakes from vortex streets | en |
| type | standard | |
| page | 80 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1953 | |
| contenttype | fulltext |