破碎波中夹气区速度场测量检测方案(粒子图像测速)

Turbulence generated by wave breaking was investigated using a novel non-intrusive measurement technique called bubble image velocimetry (BIV). The violent velocity field in the highly aerated region of a broken wave was obtained using BIV. The mean velocity and turbulent intensity were obtained by ensemble averaging 20 repeated measurements. It was found that the maximum mean velocity reached 1.81C with C being the phase speed, occurred shortly after the first impingement. The maximum turbulence intensity, however, occurred at the second impingement induced by the first splash, reached 0.96C or 67% of the maximum mean velocity at that moment.