Numerical Simulation Of The Three-dimensional Flow Field In The Current Regulator Based On The Moving Mesh

Micro-irrigation is one of the most effective ways of water-saving irrigation at present.Current regulator is the key component of micro-irrigation system. The pros and cons of itsstructure and hydraulic performance have important impacts on the operation of the entiremicro-irrigation.At present there have many problems in the study of micro-irrigationtechinique, such as lacking of flow channel design theory, spending time in regulator design,instability of current regulator and so on. Aiming at these problems, the flow field of thecurrent regulator is investigateded based on the numerical and experimental study. The mainresearch results were as follows:（1）After series of experiment on physical model, the parameters of current regulatorare tested under different discharges, mainly is the relationship of head loss and pressurebetween upstream and downstream.（2）Dynamic mesh and turbulence models are used in simulation of current regulatorsby Fluent, and the results show that the computational simulations agree well with theexperiments. The numerical simulations show that3D dynamic mesh model is best fit forsimulation of current regulators after compared with other models in calculation accuracy,precision and time.（3）The relationships between discharge of current regulators and other two parametersare carried out by the method of data fitting. The results showed that the empirical formula fordischarge and head loss is an exponential function while the formula for discharge and thepressure between upstream-downstream is a quadratic polynomial.（4）The numerical simulation results show that the three-dimensional dynamic meshmode can provide a theoretical basis for emitter product optimization.