Tomographic spatial filter velocimetry for three-dimensional measurement of fluid velocity
Tomographic spatial filter velocimetry for three-dimensional measurement of fluid velocity
复制标题
用于流体速度三维测量的层析空间滤波器测速法
DOI：
10.1007/s00348-013-1597-0
复制
发表时间：
2013
影响因子：
2.4
通讯作者：
Akio Tomiyama
中科院分区：
文献类型：
--
作者：
Shigeo Hosokawa;Takaaki Matsumoto;Akio Tomiyama
将空间滤波测速技术（SFV）扩展到三维三分量测速，将SFV处理与层析成像技术相结合，利用两台摄像机记录的颗粒立体图像重建三维颗粒分布。由于幽灵粒子通过SFV询问区域的持续时间比真实的示踪粒子的渡越时间短，因此使用基于粒子渡越时间的速度数据验证方法来消除粒子重建过程中产生的幽灵粒子。由于鬼粒子的渡越时间较短，鬼粒子对速度估算的影响并不显著。将该系统应用于自由射流和圆管中的冲击射流。尽管只使用两个摄像机，成功地测量的三维分布的时间平均速度矢量的射流的层析空间滤波测速（Tomo-SFV）。Tomo-SFV测量没有出现粒子图像测速中容易出现的峰值锁定误差。
Spatial filter velocimetry (SFV) is extended to three-dimensional three-component velocimetry by coupling the SFV processing with a tomographic technique, which reconstructs three-dimensional particle distributions from stereoscopic particle images recorded by two cameras. Since time duration of a ghost particle traveling through an interrogation area of SFV is shorter than the transit time of a real tracer particle, a validation method of velocity data based on a particle transit time is used to eliminate ghost particles generated in the particle reconstruction process. Effect of a ghost particle on velocity evaluation is not significant due to the short transit time of a ghost particle. The developed system is applied to a free jet, and an impinging jet discharged from a circular pipe. Three-dimensional distributions of time-averaged velocity vectors of the jets are successfully measured by the developed tomographic spatial filter velocimetry (Tomo-SFV) in spite of using only two cameras. The peak-locking errors, which are apt to occur in particle image velocimetry measurements, do not appear in Tomo-SFV measurements.