论文标题
增强大规模动作和旋转飞机poiseuille流动的动荡转运
Enhancing large-scale motions and turbulent transport in rotating plane Poiseuille flow
论文作者
论文摘要
根据大规模羽流的特性，引入了注入/吸力控制策略，以增强羽流的强度和旋转平面poiseuille流动中无源标量的湍流运输。该控件将经典的非渗透条件保持在稳定的一侧，并在不稳定的一侧处方不同的壁正常速度。直接的数值模拟表明，在中等旋转数字中，具有正确分布的插槽的较弱的注入/吸入（受控侧的根平方速度低于$ 1 \％$ \％$），可以显着增强与注射插槽相同的空间分布的大尺度羽流。另外，如果羽流之间的距离增加，则可以促进湍流运输效率。因此，考虑到强度和运输效率，注入插槽之间的距离应比羽流之间的固有距离稍大，以实现最大的湍流运输增强。为了进行比较，还通过模拟检查了在不稳定侧的非渗透条件和稳定侧的注射/吸力的对照。发现与不稳定的一侧相比，稳定侧的注射/吸力具有较弱的影响。这是因为羽毛是在不稳定的一侧产生的，并且控制羽流的起源更有效。
Based on the properties of large-scale plume currents, an injection/suction control strategy is introduced to enhance the strength of plume currents and the turbulent transport of passive scalar in rotating plane Poiseuille flow. The control keeps the classical non-penetrative condition on the stable side, and prescribes spanwise varying wall-normal velocity on the unstable side. Direct numerical simulations show that at medium rotation numbers, very weak injection/suction (the root-mean-square velocity on the controlled side is below $1\%$ of the bulk mean velocity) with properly distributed slots could significantly enhance the large-scale plume currents which have the same spatial distribution as the injection slots. In addition, if the distance between plume currents are increased, the turbulent transport efficiency can be promoted. Therefore, taking the strength and transport efficiency into account, the distance between injection slots should be slightly larger than the intrinsic distance between plume currents to achieve maximum enhancement of turbulent transport. For comparison, the control with non-penetrative condition on the unstable side and injection/suction on the stable side is also examined with simulations. It is found that the injection/suction on the stable side has much weaker influence compared with that on the unstable side. This is because that plumes are generated on the unstable side, and that controlling the origin of plumes is more effective.
