关键词: 水力学, 弯道水流, 纵向流速, 垂线平均, 流速分布

Abstract: The hydraulic characteristics of curved conduit flow arc one of the most interesting subjects to hydraulic researchers. Among them the longitudinal depth averaged velocity distribution is an important topic. A generalized curved conduit flow experiment was employed to obtain the longitudinal velocity parameters by adopting the ADV to measure the 3D flow velocity data. Based on the calculation methods of water surface transverse gradient and longitudinal gradient in curved flow, a longitudinal depth averaged veloeity distribution formula was theoretically established to explore the bend flow charaeteristics. Results show that the calculated data agree well with the measured ones, which provides a theoretic basis to explore the hydraulie characteristics profoundly

Key words: hydraulics , curved conduit flow , longitudinal velocity , depth averaged , velocity distribution ;