尖锐后缘尾流中的反向发卡涡

2012/07/17   下载量： 5 次

方案摘要

方案下载
应用领域 其他
检测样本 其他
检测项目
参考标准 暂无

The unsteady organization and the evolution of the coherent structures within the immediate wake of the sharp symmetric trailing-edge of a NACA0012 airfoil is investigated using two-component (2C) and tomographic particle image velocimetry (Tomo-PIV). The inspection of the Tomo-PIV results showed new vortical structures, introduced here as counter-hairpin vortices, evolve in the wake region to direct the turbulent mechanism towards recovery of the wake deficit. These vortical structures are topologically similar to the hairpins of a turbulent boundary layer as they appear to be Ushaped but with inverted orientation. The spanwise portion of a counter-hairpin vortex is in the vicinity of the wake centerline and the legs are inclined at an approximately 60 degree to the wake axis in the downstream direction. They partially wrap around the high speed streaks and frequently sweep the high-speed flow towards the wake centerline. A pattern recognition algorithm is applied to establish characterization based on an ensemble averaged counterhairpin vortex. The formation mechanism of the counterhairpin vortices is attributed to the shear layer produced along the wake centerline by the neighboring of a low and a high speed streak which promotes formation of spanwise vortices that form the vortex by connection to quasistreamwise vortices.

方案下载
配置单
上一篇 在一个双稳湍流涡旋火焰中，对间歇性动态的时间-频率定位
下一篇 实验流体力学中的图像层析重构：简述及问题

文献贡献者

北京欧兰科技发展有限公司
金牌会员 丨 第17年
查看全部资料
相关仪器 更多
相关方案
更多

相关产品

当前位置： 欧兰科技 方案 尖锐后缘尾流中的反向发卡涡

关注

拨打电话

留言咨询