【摘要】 采用以氢气泡为示踪粒子的数学粒子图像测速技术 (digital particle image velocim etry,DPIV )对三种不同雷诺数下的圆柱绕流进行了研究 ,分析了其涡量、流速分布及周期性等特点。一般 DPIV拍摄时相机固定 ,可得出一种速度场分布。本文采用静止坐标 ,用简单的方法可以达到相机随流场移动的效果 ,DPIV处理结果可以看到一些更深入的情况。同时 ,将实验结果与计算结果及其它参考资料进行了比较 ,结果表明甚为一致更多还原

【Abstract】 A DPIV technique using hydrogen bubble is adopted to study the flow around column under three different Reynold number. Its characteristic of vortex and velocity distribution and periodicity is also analyzed. Generally, the camera is fixed in DPIV to get a velocity field distribution. This paper introduces a simple method adopting static coordinate system that can get the results as camera is moving together with free flow. Some further view of flow can be obtained by the method. In addition, the results are also compared with numerical results and other references and have been found in close agreement with each other.更多还原