The slit-type energy dissipater（STED）is widely used in hydraulic projects of high water head,large discharge,and narrow river valley,thanks to its simple structure and high efficiency.However,the water wing caused b...The slit-type energy dissipater（STED）is widely used in hydraulic projects of high water head,large discharge,and narrow river valley,thanks to its simple structure and high efficiency.However,the water wing caused by the shock waves in the contraction section of the STED may bring about harmful effects.A coefficient is introduced for the application of Ippen？s theory in the STED.The expression of the coefficient is experimentally obtained.Simplified formulas to calculate the shock wave angle and the water wing scope are theoretically derived,with relative errors within 5%.展开更多
An equation of atomization quantity from energy dissipation by hydraulic jumpwas derived from dimensional analysis. Applying the Gauss diffusion equation, the spray diffusionin valley was studied under the conditions ...An equation of atomization quantity from energy dissipation by hydraulic jumpwas derived from dimensional analysis. Applying the Gauss diffusion equation, the spray diffusionin valley was studied under the conditions of continuous line source and random wind direction.Considering the spray-rain switching process, coagulation, condensation and evaporation of droplets,the authors calculated the air temperature, air relative humidity, spray density and the rainfallintensity in the lower reaches. The 3-D numerical results agree well with portotype monitoring data.展开更多
基金supported by the National Nature Science Foundation of China(Grant Nos.51279013,51379020 and 51509015)the National Key R&D Program of China(Grant No.2016YFC0401900)
文摘The slit-type energy dissipater（STED）is widely used in hydraulic projects of high water head,large discharge,and narrow river valley,thanks to its simple structure and high efficiency.However,the water wing caused by the shock waves in the contraction section of the STED may bring about harmful effects.A coefficient is introduced for the application of Ippen？s theory in the STED.The expression of the coefficient is experimentally obtained.Simplified formulas to calculate the shock wave angle and the water wing scope are theoretically derived,with relative errors within 5%.
文摘An equation of atomization quantity from energy dissipation by hydraulic jumpwas derived from dimensional analysis. Applying the Gauss diffusion equation, the spray diffusionin valley was studied under the conditions of continuous line source and random wind direction.Considering the spray-rain switching process, coagulation, condensation and evaporation of droplets,the authors calculated the air temperature, air relative humidity, spray density and the rainfallintensity in the lower reaches. The 3-D numerical results agree well with portotype monitoring data.
