摘要
In this paper,the fow physics and impact dynamics of a sphere bouncing on a water surface are studied experimentally.During the experiments,high-speed camera photography techniques are used to capture the cavity and free surface evolution when the sphere impacts and skips on the water surface.The infuences of the impact velocity(v_(1))and impact angle(θ_(1))of the sphere on the bouncing fow physics are also investigated,including the cavitation evolution,motion characteristics,and bounding law.Regulations for the relationship between v_(1)andθ_(1)to judge whether the sphere can bounce on the water surface are presented and analyzed by summarizing a large amount of experimental data.In addition,the efect ofθ_(1)on the energy loss of the sphere is also analyzed and discussed.The experiment results show that there is a ftted curve of v_(1)=17.5θ_(1)−45.5 determining the relationship between the critical initial velocity and angle whether the sphere bounces on the water surface.
作者
吕续舰
运洪禄
魏照宇
Xujian Lyu;Honglu Yun;Zhaoyu Wei(School of Energy and Power Engineering,NanjingUniversity of Science and Technology,Nanjing 210094,China;School of Oceanography,Shanghai Jiao Tong University,Shanghai 200240,China)
基金
the Fundamental Research Funds for the Central Universities(30918012201)
the Fund of the State Key Laboratory(6142604190302).
