• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Aeronautical Journal >The behaviour of circular synthetic jets in a laminar boundary layer
【24h】

The behaviour of circular synthetic jets in a laminar boundary layer

机译：层状边界层中圆形合成射流的行为

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Dye flow visualisation of circular synthetic jets was carried out in laminar boundary layers developing over a flat plate at a range of actuator operating conditions and freestream velocities of 0.05 and 0.1 ms~(-1). The purpose of this work was to study the interaction of synthetic jets with the boundary layer and the nature of vortical structures produced as a result of this interaction. The effects of Reynolds number (Re), velocity ratio (V_R) and Strouhal number (St) on the behaviour of synthetic jets were studied. At low Re and V_R, the vortical structures produced by synthetic jets appear as highly stretched hairpin vortices attached to the wall. At intermediate Re and V_R, these structures roll up into vortex rings which experience a considerable amount of tilting and stretching as they enter the boundary layer. These vortex rings will eventually propagate outside the boundary layer hence the influence of the synthetic jets on the near wall flow will be confined in the near field of the jet exit. At high Re and V_R, the vortex rings appear to experience a certain amount of tilting but no obvious stretching. They penetrate the edge of the boundary layer quickly, producing very limited impact on the near wall flow. Hence it is believed that the hairpin vortices produced at low Re and V_R are likely to be the desirable structures for effective flow separation control. In this paper, a vortex model was also described to explain the mechanism of vortex tilting.
机译：圆形合成喷嘴的染料流可视化是在一定范围内的执行器操作条件和自由流速度分别为0.05和0.1 ms〜（-1）的平板边界层上进行的。这项工作的目的是研究合成射流与边界层的相互作用以及由于这种相互作用而产生的旋涡结构的性质。研究了雷诺数（Re），速度比（V_R）和斯特劳哈尔数（St）对合成射流性能的影响。在低Re和V_R下，合成射流产生的涡旋结构表现为附着在壁上的高拉伸发夹涡旋。在中间Re和V_R处，这些结构卷成涡流环，进入边界层时会经历大量的倾斜和拉伸。这些涡流环最终将在边界层外传播，因此合成射流对近壁流的影响将被限制在射流出口的近场中。在高Re和V_R时，涡流环似乎经历了一定程度的倾斜，但没有明显的拉伸。它们迅速穿透边界层的边缘，对近壁流动的影响非常有限。因此，据信在低Re和V_R下产生的发夹涡旋可能是有效控制流分离的理想结构。在本文中，还描述了涡旋模型以解释涡旋倾斜的机理。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号