EXPERIMENTAL STUDIES AND NUMERICAL CALCULATION ON TURBULENT BOUNDARY LAYER OF WATER FLOW ALONG CURVED SURFACE

This paper will introduce experimental studies and numerical calculation onturbulent boundary layer of water flow along curved surface in our country in recent years.Onthe basis of the experimental studies,the effects of curvature and roughness on velocitydistribution and pressure distribution and the change of turbulent flow boundary layer onoverflow bucket concave surface is discussed.We proposed the empirical formula of velocity,pressure and the change of turbulent flow boundary layer on outlet bucket concave.According tothe momentum principle,we have deduced the momentum integral equation full water depthboundary layer and using the element as control unit inside the boundary layer on concavesurface of bucket.Combining with continuity equation,we have computed the boundary layerdevelopment on the bucket of a spillway.Compared with the field experimental data,thecalculation results are available.Under polar coordinates,a mathematical model for simulatingtime-averaged flow characteristics in concave surface of bucket is established.The turbulent flowfield on concave surface of bucket is calculated by SIMPLE method and this mathematicalmodel.The flow velocity field,pressure field,distribution of turbulent kinetic energy,distribution of turbulent energy dissipating rate and distribution of shear stress are available.Thecalculation value is consistent with measured test data.

EXPERIMENTAL STUDIES AND NUMERICAL CALCULATION ON TURBULENT BOUNDARY LAYER OF WATER FLOW ALONG CURVED SURFACE

This paper will introduce experimental studies and numerical calculation on turbulent boundary layer of water flow along curved surface in our country in recent years.On the basis of the experimental studies,the effects of curvature and roughness on velocity distribution and pressure distribution and the change of turbulent flow boundary layer on overflow bucket concave surface is discussed.We proposed the empirical formula of velocity, pressure and the change of turbulent flow boundary layer on outlet bucket concave.According to the momentum principle,we have deduced the momentum integral equation full water depth boundary layer and using the element as control unit inside the boundary layer on concave surface of bucket.Combining with continuity equation,we have computed the boundary layer development on the bucket of a spillway.Compared with the field experimental data,the calculation results are available.Under polar coordinates,a mathematical model for simulating time-averaged flow characteristics in concave surface of bucket is established.The turbulent flow field on concave surface of bucket is calculated by SIMPLE method and this mathematical model.The flow velocity field,pressure field,distribution of turbulent kinetic energy, distribution of turbulent energy dissipating rate and distribution of shear stress are available.The calculation value is consistent with measured test data.