农田滴灌装置输送管流场稳定性和结构优化设计

The Flow Field Stability and Structure Optimization of Drip Irrigation Device

滴灌装置是现代农业机械自动化灌溉的重要装置之一,可有效提高水资源的利用率及灌溉的效率。为了提高滴灌装置流场的稳定性,提出了一种基于CFD数值仿真计算的灌水器水管结构优化方法,并利用GAMBIT软件建立了输送管的仿真模型,通过FLUENT软件的数值模拟计算,得到了不同滴灌装置输送管结构参数下的流场分布特性。仿真结果表明:仿真和实验结果的偏差在10%以内,结果较为可靠,在压力和排齿尖参量一定的情况下,输送管的流量随着齿尖角度的增大而增大,齿尖角度越小,流量越均匀和平缓;在压力和排齿尖角度一定的情况下,随着齿尖参量的增大,流量有降低的趋势。因此,建议齿尖角宜选择在60°左右,齿尖参差量宜选择为0.2 5左右。

Drip irrigation device is one of the important devices in modern agricultural machinery automation irrigation. Its application not only effectively improves the utilization of water resources, but also greatly improves the efficiency of irrigation. In order to improve the stability of the flow field of drip irrigation device, a CFD numerical simulation based on the calculation of the emitter tube structure optimization method, and using gambit software to build the simulation model of conveying pipe, by means of the software FLUENT, numerical simulation, it obtained the different filling device con- veying pipe structure parameter of flow field distribution characteristics was proposed. The simulation results show that the deviation of simulation and experimental results in less than 10% , the results more reliable, under pressure and exhaust tip parameters certain situation, conveying pipe flow with the increase of the angle of the tooth tip increases, smaller tip angle, flow is uniform and fiat ; under pressure and exhaust tip angle of situation, along with the increase of the tooth tip parameters, flow decreased. Therefore recommended tooth angle should be chosen at about 60 degrees, the amount of tooth tip should choose about 0.25 stagger.