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本文为探讨挑射水流在冲坑内的基本特征与消能机理， 首次利用热膜测速技术量测定床冲坑中淹没射流的沿程时均流速和脉动流速分布， 并同时量测沿坑底的压强场， 给出入射区、冲击区和壁射流区三个子区的流速和压强的变化规律； 计算坝面摩阻消能、空中扩散消能和冲坑水垫中紊动剪切消能三部分的消能效率．
In this paper, to study the basic characteristics and energy dissipation mechanism of the pick-up water flow in the pit, the distribution of the average flow velocity and the pulsation velocity along the submerged jets during the measurement of the pit-sinking pit is measured by the hot film technology for the first time. , The variation law of the velocity and pressure in the three sub-zones of the incident zone, the impact zone and the wall jet zone is given. The three aspects of the frictional energy dissipation at the dam surface, the dissipative energy in the air and the turbulent shear energy dissipation in the pit cushion are calculated Energy efficiency.