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 |
A novel method is introduced for increasing the accuracy and extending the dynamic range of time-resolved PIV. The approach extends the well-known concept of multiframe particle tracking velocimetry (PTV) to cross-correlation analysis employed by PIV. The working principle is based on the determination of fluid element trajectories by tracking their position across an image sequence. The fluid trajectory correlation (FTC) algorithm deals with the effect of trajectory curvature and non-uniform velocity during the considered time interval by allowing the motion within the trajectory to be nonlinear. In addition, the local image deformation accounts for the spatial velocity gradient and its change along the trajectory. The principle for reduction of the measurement error is threefold: by enlarging the temporal measurement interval, the relative error becomes smaller; secondly, the random error is reduced with the use of a least-squares polynomial fitting approach to the individual trajectory; and finally, the use of nonlinear fitting functions allows for a reduction in truncation errors. The evaluation of velocity proceeds then directly from the analytical derivatives of the least-squares functions. The principal features of this algorithm are compared with a single-pair iterative image deformation method through the use of synthetic image sequences depicting steady flows (solid body rotation and uniform motion), and with an application to an experimental data set of a submerged circular jet.
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
相关产品
汽车光学检测系统AIS
PT403型波长可调谐皮秒激光器
ANL系列高能量高重复频率DPSS纳秒激光器
APL4206 系列高能量皮秒激光放大器
UltraFlux FF/FT 5000 高能量可调谐飞秒激光器系统
UltraFlux FT300型波长可调谐飞秒激光器系统
Ekspla 超高功率激光器系统SYLOS 2A
LaVision PTUx 可编程时间控制单元
LaVision 用于粒子成像测速PIV的相机
LaVision StrainMaser 全场应变测试系统组件
LaVision 用于数字图像相关DIC的相机
LaVision StrainMaster 数字图像相关分析软件包
LaVision 标定板
LaVision StrainMaster 形变应变成像测量系统
LaVision StrainMaster DVC 体视全场应变测量系统
关注
拨打电话
留言咨询