方案摘要
方案下载应用领域 | 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。
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.
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
Particle-laden Taylor-Couette流:高阶转变和径向局部波浪涡旋的证据
7根杆束的流体-结构相互作用:用实验数据对比数值模拟
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