摘要
Hydraulic characteristics of turbulent boundary layer of bucket are very important for hydraulic engineering designs. Some hydraulic measurements for the bucket of modeling overflow dams have been completed. The effects of surface curvatures of the bucket on velocity, pressure and turbulent boundary layer have been systematically investigated. The bucket was specially designed using different surface curvatures with seven radii. The results have shown that the effects of the surface curvatures on the velocity distributions are not proportional and the centrifugal pressure coefficient has a transitional quality. A definition of the turbulent layer thickness of the bucket was suggested and the development of the turbulent layer was indicated experimentally. It is found that the maximum value of the relative boundary layer thickness appears about 0.25 of relative arc length.
Hydraulic characteristics of turbulent boundary layer of bucket are very important for hydraulic engineering designs. Some hydraulic measurements for the bucket of modeling overflow dams have been completed. The effects of surface curvatures of the bucket on velocity, pressure and turbulent boundary layer have been systematically investigated. The bucket was specially designed using different surface curvatures with seven radii. The results have shown that the effects of the surface curvatures on the velocity distributions are not proportional and the centrifugal pressure coefficient has a transitional quality. A definition of the turbulent layer thickness of the bucket was suggested and the development of the turbulent layer was indicated experimentally. It is found that the maximum value of the relative boundary layer thickness appears about 0.25 of relative arc length.
