论文标题
泵引起的壁正常涡流的主动流控制，并稳定吹
Active flow control of a pump-induced wall-normal vortex with steady blowing
论文作者
论文摘要
泵上游淹没的涡流的出现可以降低泵的摄入效率并造成结构性损害。在这项研究中，我们考虑使用具有稳定吹动的活动流控制，以增加单相泵引起的壁正常涡流模型中的压力分布，该模型基于汉堡涡流，其沿其对称平面规定的无滑界边界条件。我们控制的目标是修改涡流核心速度配置文件。试图增加这些变化以增加核心压力，从而减轻对泵的有害影响。进行三维直接数值模拟（DNS），以检查涡流注入涡流及周围的轴向动量注射的动力学。我们发现，与不受控制的情况相比，主动流控制方法可以有效地改变壁正常涡流结构，并显着增加低核压力81％。结果表明，当控制设置以低为中心的方式引入时也有效。与我们以前的工作中基于不稳定的吹吹和吸气的致动（Liu et al.2018）相比，当前的稳定控制技术提供了有效而简单的流量控制设置，可以支持泵的强大操作。
The emergence of a submerged vortex upstream of a pump can reduce pump intake efficiency and cause structural damage. In this study, we consider the use of active flow control with steady blowing to increase the pressure distribution within a single-phase pump-induced wall-normal vortex model, which is based on the Burgers vortex with a no-slip boundary condition prescribed along its symmetry plane. The goal of our control is to modify the vortex core velocity profile. These changes are sought to increase the core pressure such that detrimental effects on the pump are alleviated. Three-dimensional direct numerical simulations (DNS) are performed to examine the dynamics of the vortex with the application of axial momentum injection at and around the root of the vortex. We find that the active flow control approach can effectively modify the wall-normal vortical structure and significantly increase the low-core pressure by up to 81% compared to that of the uncontrolled case. The result shows that the control setup is also effective when it is introduced in an off-centered manner. Compared to the unsteady blowing and suction based actuation from our previous work (Liu et al. 2018), the current steady control technique offers an effective and simple flow control setup that can support robust operations of pumps.
