Optimization of anti-clogging for shunt-hedging dripper based on motion characteristics of sand particle
Aiming at the problem that the emitter was easy to be blocked due to the high sediment con-tent in the irrigation water source,the optimization of anti-clogging for shunt-hedging drip irrigation emitters was carried out.The sensitive diameter ranges of sand particles that was easy to block the emit-ter was determined through the short-cycle anti-clogging tests.Computational fluid dynamics(CFD)method was applied to analyze the flow field distribution in the flow channel and the motion characteris-tics of sand particles within the sensitive diameter range.Finally,the sensitive areas in the flow channel boundary was divided according to the numerical simulation results,and the structure optimi-zation was carried out.The results show that the larger the sand particle size,the worse its followability and the faster the process of blocking the emitters.Sand particles with a diameter greater than 0.10 mm can easily cause blockage of the emitter.There are sensitive areas on the boundary of the flow channel.When the sand particles collides with the sensitive areas,their movement direction will be changed and it will enter the vortex area to aggregate,resulting a significant increase in the risk of the flow channel blockage.The structure optimization aimed at the sensitive area improves the motion characteristics of sand particles.After optimization the hydraulic performance of the optimized emitter is slightly reduced by 1.5％,but its anti-clogging performance is greatly improved by 30.0％-60.0％.The structure optimi-zation scheme based on the sand movement characteristics can provide a reference for the anti-clogging optimization design of the flow channel of the emitter.
万方数据
维普
