Numberical Simulation Of Flow Measurement Flume Based On Fluent

Measuring water of irrigation district is basic in the popularization and application process of agricultural water-saving irrigation technology. With water saving agriculture development and pricing mechanism reform, it is important to study simple structure and high precision flow measurement devices. quadratic-orthogonal-rotation-combination design,k -εturbulent model combining with VOF method, porosity method and wall function was used to simulate and research the flow of parabola-shape flow measurement flume. The main research results as follows:(1) The mathematical model of unsteady three-dimensional in parabola-shape flow measurement flume is created in this paper. The computed results and the data obtained by the authors in test were compared, and they agree well. This result shows that the model can simulate the flow and free surface around parabola-shape flow measurement flume.(2) Quadratic-orthogonal-rotation-combination design is used to research the effect on discharge created by the cross-section size of U-shape-channel and parabola-shape flow measurement flume. According these test methods, this paper has simulated the discharge in the parabola-shape flow measurement flume.(3) Based on DPS Data-Processing System and the numerical simulations results, the author establish Simulation discharge regression model, which describe the relationship between cross-section sizes and discharge.(4) The relative error of Simulation and calculation solution of discharge in detail is analyzed in different Cross-section sizes of parabola-shape flow measurement flume. The result shows that the simulation vale is reliable. And simulation discharge regression model can use to calculate the discharge.(5) According to the simulation discharge regression model, the effect of single and two factors on different water and discharge relationship are analyzed. The result shows that the interaction effect caused by radius and relative depth is clearer than radius and extraversion angle; the roughness of channel has less effect on discharge. However, contraction ratio and slope of channel have more effect on water stage and discharge.