【摘要】 采用氢气泡粒子图像测速技术 (DigitalParticleImageVelocimetry,DPIV)对圆柱绕流进行了研究。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 ,从而利用DPIV技术将原来显示不出来的涡在变换后的参考坐标系下显示出来。发现DPIV实验结果静止坐标和运动坐标间的联系 ,并与实际流动显示结果进行比较 ,发现一般拍摄的流动显示结果为静止坐标结果 ,而直接DPIV计算结果为运动坐标结果。更多还原

【Abstract】 Hydrogen bubble DPIV technique is adopted to study column circuitous flow.Generally,the camera is fixed in shooting with DPIV,by which a kind of distribution of velocity field can be obtained.Static axis is adopted to get the result that the camera is moving together with flow field, Then,the vortex invisible on primary axis can be shown by DPIV.The connection between the DPIV test result of the static axis and that of locomotive axis is found.Compared with the actual flow visualization result,it’s found that the common flow visualization result is that in static axis and the direct DPIV result is that in locomotive axis.更多还原