• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>60th aeronautics conference and AGM : Aerospace clusters: where are we headed? >Flow past a circular cylinder fitted with tripwires: Symmetric and asymmetric tripping near a critical location
【24h】

Flow past a circular cylinder fitted with tripwires: Symmetric and asymmetric tripping near a critical location

机译：流过装有跳闸线的圆柱体：在关键位置附近发生对称和非对称跳闸

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

An experimental investigation is carried out to compare the flow structure around tripped circular cylinders. Consideration is given to tripping via a single straight wire and via two straight wires separated by 90°. Cinema technique of high-image-density Particle Image Velocimetry (PIV) was employed to characterize the time-averaged and unsteady flow structures. On the cylinder surface, the trip wires were placed near a location that was defined to be critical location previously by Ekmekci and Rockwell (2010). Both the single wire and the two wire application on the cylinder surface near the critical location resulted in a considerable amount of attenuation in coherence and strength of the Karman instability. A single trip wire at this location was found to distort the time-averaged near-wake structure, resulting in a highly asymmetric vorticity distribution compared to the case of a smooth cylinder. This asymmetry was linked to the early onset of transition in the wire-side shear layer by the effect of the wire. Introduction of a second wire on the opposing side of the cylinder resulted in an early transition on both of the shear layers, leading to a rather symmetric time-averaged structure.
机译：进行了实验研究，以比较跳闸的圆柱周围的流动结构。考虑通过单根直线和两条相隔90°的直线跳闸。采用高图像密度粒子图像测速技术（PIV）的电影技术来表征时间平均和不稳定的流动结构。在汽缸表面上，脱扣线被放置在一个位置附近，该位置先前由Ekmekci和Rockwell（2010）定义为关键位置。在靠近关键位置的圆柱体表面上应用单线和双线都会导致卡曼不稳定性的相干性和强度大大降低。发现在此位置的单跳线会扭曲时间平均的近尾波结构，与光滑圆柱体的情况相比，导致高度不对称的涡度分布。这种不对称性是由于金属丝的作用与金属丝侧剪切层中过渡的早期发生有关。在圆柱体的另一侧引入第二根金属丝会导致两个剪切层都提前过渡，从而导致时间平均结构相当对称。

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