在受到漩涡诱导振动（VIV）影响下的系留球体尾流的Tomo-PIV测量

2019/08/06   下载量： 0 次

方案摘要

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应用领域 航空航天
检测样本 航天
检测项目
参考标准 暂无

采用德国LaVision公司的软件平台和四台Imager SX 4M型CCD相机。构成一套层析PIV处理系统。并利用这样的系统对受到漩涡诱导振动（VIV）影响的系留球体尾流进行了Tomo-PIV测量。

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    The 3D flow field in the wake of a tethered sphere (D = 6 mm, m‡ = 7:77, L‡ = 4:1)undergoing vortex induced vibrations (VIV) in a water tunnel, was measured using tomographic particle image velocimetry (tomo-PIV). The flow field was investigated for four different reduced velocities ranging between 3:6 < U‡ < 13:2, corresponding to Reynolds numbers ranging between 382 < ReD < 1; 392. At U‡ = 3.6, the sphere did not oscillate and shed vortices resembled a train of “hairpin” heads having a vertical plane of symmetry.
At U‡ = 5.8, sphere oscillations were highly periodic and “omega”-shaped vortices having a horizontal plane of symmetry were alternately shed, and transformed into vortex rings further downstream while still connected to upstream structures by a thin vortex filament. At U‡ = 7:9 and 13.2, the sphere’s transverse amplitude response was intermittent and vortices in the
sphere’s wake were characterized by longitudinal and vertical “struts” as well as “arches”, with seemingly little organization.

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北京欧兰科技发展有限公司
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