狭缝内双圆柱对称位置空泡溃灭试验研究OA

Based on a high-speed photography technology test bench,the dynamics of a bubble collapse at the symmetrical positions of double cylinders within a narrow gap were experimentally inves-tigated.The growth and collapse of cavitation at different initial positions were qualitatively analyzed,and typical experimental phenomena at three dimensionless distances were summarized.Furthermore,the characteristics of cavitation morphology evolution,centroid movement,bubble interface motion,etc.,under different dimensionless distances were quantitatively explored.The main conclusions of the study show that based on the dimensionless distance of the cavitation(l*),the dynamic behavior of the cavitation at the symmetrical position of double cylinders can be summarized into three typical ca-ses:for case 1(l* is small),the left and right sides of the bubble interfaces are significantly concave,and no jet occurs.For case 2(l* is medium),the left and right bubble interfaces are weakly concave,but a jet occurs.For case 3(l*is large),the right side of the bubble interface is concave,but a jet occurs.The evolution of the bubble wall morphology on the side away from the double cylinders is more violent than that close to the double cylinders,and the intensity increases with the increase of the di-mensionless distance.At the symmetrical position of double cylinders,the roundness and centroid movement distance of the cavitation bubble during its collapse are directly proportional to the collapse radius and dimensionless distance.