An experimental study into the effects of streamwise and spanwise acceleration in a turbulent boundary layer
An experimental study into the effects of streamwise and spanwise acceleration in a turbulent boundary layer
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湍流边界层中流向和展向加速度影响的实验研究
DOI:
10.1007/s00348-012-1414-1
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发表时间:
2012
影响因子:
2.4
通讯作者:
Pearce N
中科院分区:
文献类型:
--
作者:
Pearce N
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.
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影响因子:
3.7
作者:
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通讯作者:
R. Simpson
影响因子:
3.7
作者:
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作者:
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作者:
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通讯作者:
H. Eckelmann
DOI:
--
发表时间:
2009
期刊:
影响因子:
--
作者:
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通讯作者:
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