Study On Hydraulic Characteristic Of Mushroom Shape Intake Flow

The mushroom shape intake were widely used in the thermal and nuclear power plants of China, understanding and mastering the hydraulic characteristic of this intake has notable instructional significance to engineering design and the dispose of intake. Based on status quo and methods of research, the hydraulic characteristic of the mushroom shape intake flow was studied combined with experimental investigation and numerical simulating.Under the different water depth and different velocity, detailed X-Y, X-Z plane velocity fields were measured by PIV (Particle Image Velocimetry) and carefully analyzed. The complicated 3D flow of the same water region concerned were mathematically simulated by the realizable κ-ε turbulence model, comparisons of the calculated results with the measured values show their good agreement in whole. The main aspects of the work proceeded and the results obtained were summarized as follows:(l)It demonstrated that the submergence depth has little impact on the velocity distribution and other hydraulic characteristic of the intake and its near area;(2)Remarkable 3D turbulence characteristic was discovered in the velocity fields inside the intake and its near area, its high dependence on R.(3)Under condition of dynamic the velocity distribution at the intake entrance shows non-uniformity, which degree dependence on R. "Draught" phenomena appear when R exceeds certain value.Consistency of the results of numerical simulation and experimental investigation shows that the realizable k-e turbulence model is fit for the study of the velocity distribution of the intake flow.Primary study about the measures of the complicated 3D flow of mushroom shape intake was made by PIV, the result of which can enhance the understanding about the hydraulic mechanism characteristic of intake entrance, and can also provide scientific basis for the design and disposal of intakes.