Evaluation of the Selection of Parameters for the Shrinkage Section of Miniature Recirculation Tank
Structural parameters of the contraction section of the circulating water tank are selected and evaluated to improve the flow field quality of the working section of the circulating water tank.Using the dimensionless method,the cross-sectional area of the inlet of the contraction section with shrinkage ratios of 7,8,9 and 10 is rounded,and the actual shrinkage ratios of the contraction section are obtained as 7.360,8.160,9.000 and 9.878 respectively;ANSYS Fluent software is used to calculate and analyze the three-dimensional flow field of three typical shrinkage curves,such as vickers curve,bicubic curve and quintic curve,based on the standard k-e turbulence numerical model,and the mid-vertical section along the flow direction is given.The velocity streamline diagram and pressure cloud diagram,the change rules of axial pressure and pressure gradient,and the exit cross-section velocity distribution cloud diagram;the velocity standard deviation value and the axial static pressure change rate are introduced to comprehensively analyze the shrinkage performance of the contraction section of the circulating water tank,and select optimal shrinkage curve.Numerical simulation results show that the vickers shrinkage curve is optimal for the shrinkage section with an axial length of 475 mm and a shrinkage ratio of 7.360.
circulating water tankANSYS Fluentshrinkage curvenumerical simulation