Effects of spanwise rotation on the structure of two-dimensional fully developed turbulent channel flow
Effects of spanwise rotation on the structure of two-dimensional fully developed turbulent channel flow
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DOI：
10.1017/s0022112072002502
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发表时间：
1972-12
影响因子：
3.7
通讯作者：
J. P. Johnston;Robert M. Halleent;D. K. Lezius
中科院分区：
文献类型：
--
作者：
J. P. Johnston;Robert M. Halleent;D. K. Lezius
本文叙述了在绕展向轴作定常旋转的槽道中充分发展的紊流的实验。二维平均流区域的科里奥利力分量影响局部和全局稳定性。观察到或推断出三种与稳定性相关的现象：（i）局部稳定（不稳定）壁层中壁层条纹破裂速率的降低（增加）;（ii）稳定层中向湍流转变的完全抑制;（iii）通过泰勒-戈特勒涡旋不稳定性的增长，在通道的不稳定侧发展出大规模的滚动细胞。适当的局部稳定性参数是Bradshaw（1969）为这种情况以及弯曲壁上流动和具有密度分层的剪切层流的类似情况所制定的Richardson数。旋转稳定的局部效应，如壁层中湍流应力的减少，可以以简单的方式与局部Richardson数相关。本文不仅研究了这种效应，而且通过流动显示的方法，揭示了一些潜在的结构变化所造成的旋转。
Experiments on fully developed turbulent flow in a channel which is rotating at a steady rate about a spanwise axis are described. The Coriolis force components in the region of two-dimensional mean flow affect both local and global stability. Three stability-related phenomena were observed or inferred: (i) the reduction (increase) of the rate of wall-layer streak bursting in locally stabilized (destabilized) wall layers; (ii) the total suppression of transition to turbulence in a stabilized layer; (iii) the development of large-scale roll cells on the de-stabilized side of the channel by growth of a Taylor-Gortler vortex instability. An appropriate local stability parameter is the Richardson number formulated by Bradshaw (1969) for this case and the analogous cases of flow over curved walls and of shear-layer flow with density stratification. Local effects of rotational stabilization, such as reduction of the turbulent stress in wall layers, can be related to the local Richardson number in a simple way. This paper not only investigates this effect, but also, by methods of flow visualization, exposes some of the underlying structure changes caused by rotation.