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Simulation and Experiment Research of Flow Field with Sprinkler Reconstruction in Imageware Based on Reverse Engineering

Author: XuLin
Tutor: HanWenZuo
School: Northwest University of Science and Technology
Course: Agricultural Electrification and Automation
Keywords: impact sprinkler reverse engineering numerical simulation experiment
CLC: S277.94
Type: Master's thesis
Year: 2011
Downloads: 21
Quote: 0
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Abstract


As a result of evaluating the research progress and developing trend of impact sprinkler at home and abroad, there is few literature about numerical simulation study on impact sprinkler with computational fluid dynamics(CFD). In order to develop the impact sprinkler CFD numerical simulation , the thesis studied the flow field characteristics of Rain Bird 30IBH impact sprinkler. Reconstructing the surface of sprinkler runner bend by reverse engineering method, the max and average geometric deviation between surface and point clouds is 0.4660mm and 0.0993mm, standard deviation is 0.0721mm. Measured the inlet, range and spreader nozzles with a vernier calipers, and constructed the whole surface of sprinkler runner in Imageware.Change the runner surface into 3D solid model, and generated it’s grid with Tet/Hybrid cell. Simulated the flow field with 6 nozzle combinations and 12 inlet pressures with RNG k -εmodel and SIMPLEC solution, found the regulars among inlet pressure, flow rate, static pressure, turbulent kinetic energy and standard deviation of these parameters. Results of simulation show that: flow rate of range nozzle increasing with range nozzle diameter largen and decreasing with spreader nozzle diameter diminish, which almost have no relationship with inlet pressure. Velocity average of inlet and outlets of nozzles increasing with inlet pressure increasing. Largening the diameter of range nozzle, velocity average of inlet will be larger, range nozzle outlet will change irregularly and spreader nozzle outlet almost static. Largening the diameter of spreader nozzle, velocity average of inlet and range nozzle outlet increase but spreader nozzle static. Turbulent kinetic energy average of inlet will larger by increasing the inlet pressure or diameter of range or spreader nozzle. Turbulent kinetic energy average of range nozzle increasing with inlet pressure increasing , decreasing by range nozzle largen and changing irregularly with spreader nozzle largen. Turbulent kinetic energy average of spreader nozzle outlet increasing with inlet pressure increasing except the nozzles are 4.37×3.18mm, largening the diameter of range or spreader nozzle will reflect on changing irregularly. The transition of spreader nozzle and bend have the biggest static pressure, that should be pay attention to when designing.Comparison of flow rate both simulated and experimental shows that, their relative error increasing with inlet pressure. When inlet pressure between 180~320kPa, the max and min relative error are 33.66% and 9.47% separately. The relative error is less than 15% when inlet pressure between 340~400kPa except nozzles are 4.37×2.38mm,which is 15.64%, a little greater 15%.

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CLC: > Agricultural Sciences > Agricultural Engineering > Irrigation and water conservancy > Irrigation and drainage > Drainage and Irrigation Machinery and equipment > Irrigation equipment
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