LDV measurements near a vortex shedding strut mounted in a pipe
The velocity field around a vortex shedding strut mounted in a circular pipe has been observed in detail with a laser Doppler velocimeter (LDV) at a pipe Reynolds number equal to 90,000. The instantaneous velocity is decomposed into mean, periodic, and random components. Only the first two harmonics are large enough to be detected; the large-scale structure can be characterized by just these two these and the mean. Profiles of the different velocity terms are given upstream of, downstream of, and close to the strut. The two-dimensional velocity vector field of the mean flow on the transverse diametral plane of symmetry is presented along with its streamlines. Finally, for each spatial component, profiles of vortex visibility, the ratio of the energy of a periodic component to the total fluctuating energy in a narrow frequency band, are given.
- Research Organization:
- National Bureau of Standards, Washington, DC 20234
- OSTI ID:
- 5679269
- Journal Information:
- J. Fluids Eng.; (United States), Vol. 105:2
- Country of Publication:
- United States
- Language:
- English
Similar Records
Experiments on densely-loaded non-Newtonian slurries in laminar and turbulent pipe flows: Quarterly technical progress report No. 5
Experiments on densely-loaded non-Newtonian slurries in laminar and turbulent pipe flows: Quarterly technical progress report No. 6