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An experimental study into the effects of streamwise and spanwise acceleration in a turbulent boundary layer
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Pearce, N. F., Denissenko, Petr and Lockerby, Duncan A. (2013) An experimental study into the effects of streamwise and spanwise acceleration in a turbulent boundary layer. Experiments in Fluids, Volume 54 (Number 1). Article number 1414. doi:10.1007/s00348-012-1414-1
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Official URL: http://dx.doi.org/10.1007/s00348-012-1414-1
Abstract
We compare two turbulent boundary layers produced in a low-speed water channel experiment. Both are subjected to an identical streamwise pressure gradient generated via a lateral contraction of the channel, and an additional spanwise pressure gradient is imposed on one of the layers by curving the contraction walls. Despite a relatively high streamwise acceleration, hot-film probe measurements of the mean-velocity distributions show that the Reynolds number increases whilst the coefficient of friction decreases downstream. Visualization of the viscous layers using hydrogen bubbles reveal an increase in the non-dimensional streak spacing in response to the acceleration. Changes in statistical moments of the streamwise velocity near the wall suggest an increased dominance of high-velocity fluctuations. The near-wall streaks and velocity statistics have little sensitivity to the boundary layer three-dimensionality induced by the spanwise pressure gradient, with the boundary-layer crossflow velocity reaching 11 % that of the local freestream velocity.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||
| Journal or Publication Title: | Experiments in Fluids | ||||
| Publisher: | Springer | ||||
| ISSN: | 0723-4864 | ||||
| Official Date: | 2013 | ||||
| Dates: |
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| Volume: | Volume 54 | ||||
| Number: | Number 1 | ||||
| Page Range: | Article number 1414 | ||||
| DOI: | 10.1007/s00348-012-1414-1 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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