《《HYDRAULIC CHARACTERISTICS OF VERTICAL VORTEX AT HYDRAULIC INTAKES》.pdf

143 Ser.B, 2007,19(2):143-149 HYDRAULIC CHARACTERISTICS OF VERTICAL VORTEX AT * HYDRAULIC INTAKES CHEN Yun-liang State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China College of Hydraulic and Hydroelectric Engineering, Sichuan University, Chengdu 610065, China, E-mail:liangyunchen@163.com WU Chao, YE Mao State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China JU Xiao-ming College of Hydraulic and Hydroelectric Engineering, Sichuan University, Chengdu 610065, China (Received December 2, 2005; Revised February 13, 2006) ABSTRACT: The trace of vertical vortex flow at hydraulic vortex extending to the free surface can lead to air intakes is of the shape of spiral lines, which was observed in entrainment that can cause discharge reduction, the presented experiments with the tracer technique. It energy loss, and mechanical damage[1-3]. Hydraulic represents the fluid particles flow spirally from the water scale models have been successfully used as design surface to the underwater and rotate around the vortex-axis [4] [5] tools in a wide variety of situations . Lu multi-cycle. This process is similar to the movement of screw. presented the results of an experimental study on To describe the multi-circle spiral characteristics under the axisymmetric condition, the vertical vortex would change not the characterist