超高速转镜扫描相机扫描速度的校准及应用方法

研制了一套超高速转镜扫描相机扫描速度的校准装置,采用严格控制狭缝宽度和边缘质量的双狭缝、超快响应（0.7 ns）的光电倍增管以及相应措施,改善光电倍增管阴极不同部位灵敏度的一致性,使得校准装置的相对测量扩展不确定度达到了0.1％;给出了扫描速度校准的应用方法,并且分析了气压对相机符合转速的影响.     

Investigation on the cavitation bubble collapse and the movement characteristics near spherical particles based on Weiss theorem

In this paper, the cavitation bubble dynamics near two spherical particles of the same size are investigated theoretically and experimentally. According to the Weiss theorem, the flow characteristics and the Kelvin impulse are obtained and supported by the sufficient experimental data. In terms of the initial bubble position, the bubble size and the distance between the two particles, the collapse morphology and the movement characteristics of the bubble are revealed in detail. The main findings include: (1) Based on a large number of experimental results, it is found that the Kelvin impulse theoretical model established in this paper can effectively predict the movement characteristics of the cavitation bubble near two particles of the same size. (2) When the initial bubble position is gradually away from the particles along the horizontal symmetry axis near two particles of the same size, the movement distance of the bubble centroid in the first period increases first and then decreases. (3) When the initial position of the bubble centroid is at the asymmetric position near the two particles, the movement direction of the bubble centroid is biased towards the particle closer to the bubble, but not towards the center of this particle.