Based on Pro/E Reconstruct Sprinkler Structure and Investigations on Internal Flow Characteristic of the Sprinkler by Numerical Simulation and Experiment Methods
|Author||Nguyen Van Lanh|
|School||Northwest University of Science and Technology|
|Course||Agricultural Mechanization Engineering|
|Keywords||Computational fluid dynamics (CFD) impact sprinkler numerical simulation structure parameter|
We have known that the traditional procedure of designing a new sprinkler can be divided into four steps:structure design, manufacture, assembling and experiment. The structured design work plays an important role since the structure will greatly affect the working ability of the manufactured sprinkler. However, the engineer only can know the working performance of the sprinkler after finishing the experiment step. For very long time, engineers relied on the traditional method known as trial and error to develop a new sprinkler. This approach much depends on the engineers’skill and really time consuming and costly. The development of Computational Fluid Dynamics (CFD) methods typical is FLUENT software has been provided engineers a faster and more effective approach. The software can be used to simulate the operation of sprinkler involve the effects of many different parameters on the flow rate and flow filed distribution of the sprinkler after being designed. However the degree of truth of these simulative data as compared to experimental data is still an issue of consideration. This thesis aims to reconstruct the Rain Bird 30PSH impact sprinkler by Pro/E software and investigate the internal flow characteristics based on numerical simulation and experiment.At first, the sprinkler was cut to two parts following the center section by the linear cutting machine. Based on the measuring parameters, sprinkler 3D model was reconstructed by Pro/E software. After receiving the 3D model that the Pro/E reconstructed in previous step, the GAMBIT software makes the task of developing drip and mesh. The simulation was presented by the FLUENT software which was working base on meshed file from GAMBIT software. Therefore, the preprocessor for geometry modeling and mesh generation by the GAMBIT was very important in this study. Meanwhile, we experimented on the Rain Bird 30 PSH impact sprinkler to compare the results with simulation and manufacturer results.Some statements below were carried out from the simulation, experiment and comparison:Both the simulative and experimental results indicated that the flow rate, velocity magnitude, turbulent kinetic energy were directly proportional to the inlet pressure and the nozzle size. The results also revealed that there was not much different in flow rate distribution between the range nozzle and spreader nozzle in the case of simulation and the experiment as well.In addition, the internal flow characteristics of the sprinkler could be observed by FLUENT simulation. The study can give us a better understanding of sprinkler’s operational characteristics which is useful for new sprinkler design.The comparison between the simulative and experimental results with the standard data provided by the sprinkler manufacturer has shown that there were not significant differences between these compared data.In general, the simulative results were quite good agreement with the experimental results and the standard results. Therefore, it can be concluded that the FLUENT software can be used to simulative quite exactly the working characteristic of the sprinkler and it has great potential in supporting for a new sprinkler design with optimum parameters.