摘要
建立了基于连续式激光光源的时序粒子图像速度场(TR-PIV)测试系统,考虑到计算机存储设备的数据传输瓶颈,采用磁盘阵列数据采集技术配合高速相机实现了长时间粒子图像场的高速连续采集,并采用该系统对低速水槽中自由来流方柱绕流的湍流场进行了长时间125 Hz连续采样,通过法向速度信号的FFT分析以及互相关分析获取了大尺度相关结构的变化特征.
Time-resolved particle image velocimetry （TR-PIV） based on continuous laser illumination, which is for particular use of measuring low-speed water flow, was established. Long time continuous recording of the particle images was achieved by integrating the redundant array of independent disk （RAID） system and high-speed camera. The turbulent boundary layer flow past a two-dimensional square cylinder flush-mounted on a plane wall was measured at 125 Hz. The unsteady characteristics of the large-scale vortical structures embedded in the turbulent flow were revealed in terms of FFT and cross-correlation analy- sis of the fluctuating velocity signals.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2009年第8期1254-1257,共4页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金资助项目(50606024)
NSFC-KOSEF基金资助项目(50711140398)
关键词
连续式激光
高速相机
时序粒子图像测速
磁盘阵列
continuous laser
high speed camera
time-resolved particle image velocimetry （TR-PIV）
diskarray
