【摘要】 应用ＬＤＶ（ＬａｓｅｒＤｏｐｐｌｅｒＶｅｌｏｃｉｍｅｔｅｒ）测速技术及氢气泡流动显示技术对水流中平板边界层的发展进行了详细的观测，研究了来流湍流度对边界层转捩、湍流边界层特性等的影响，得到了层流边界层、转捩区、湍流边界层区的分区界限，在本实验条件下，来流湍流度对边界层转捩有非常明显的作用，但对湍流边界层的特性影响不大．更多还原

【Abstract】 With Laser Doppler Velocimeter (LDV) and hydrogen bubble visualization techniques,the detailed measurement and observations have been carried out for the development ofboundary layer flow over a flat plate. The effects of turbulent intensities on the boundary layer transition and on the characteristics of turbulent boundary layer are investigated. and thecriteria to divide the laminar boundary layer. the transitional region and the turbulent boundary layer are obtained. In the present experiments. it is found that the turbulent intensitieshave significant influence on the boundary layer transition and less influence on the characteristics of turbulent boundary layer.更多还原