双流体喷嘴雾化控制特性研究

Study on Atomization Control Characteristics of Twin-fluid Nozzle

双流体喷嘴具有雾化效果稳定、显著节能、药量调整范围大和优异的抗堵塞性能等特点,对于提高施药精确性、降低药液浪费和减少环境污染有重要意义。为此,将双流体喷嘴用于猕猴桃园喷雾,使用自主搭建的双流体喷雾试验平台,采用了扇形喷嘴、圆形喷嘴、广角圆形喷嘴3种喷嘴,进行了不同气压下雾化流场的喷雾试验,研究了最佳液体压力恒定的情况下,气路气压的变化对雾化角、贯穿距、流量及压力损失等雾化特性参数的影响。结果表明:扇形喷嘴优于圆形喷嘴和广角圆形喷嘴;随着气压的增大,喷雾的贯穿距先增大后减小;随着气压的增大,雾化角呈现先增大后减小的趋势;随着气压的增大气体流量增大,液体流量减小,气路压力损失较大。对猕猴桃园来说,气压在2.5bar时,选用扇形喷嘴较为适宜,为气液双流式变量喷雾的研究奠定了基础。

The twin-fluid nozzle had the characteristics of stable atomization effect,significant energy saving,large adjustment range and excellent anti-clogging performance,it is important to improve the control accuracy,reduce the waste of liquid medicine and reduce the environmental pollution,the twin-fluid nozzle for spraying kiwifruit park. Using twin-fluid spray test platform was self built,fan nozzle,circular nozzle,wide-angle circular nozzle three by the nozzle,tested under different pressure spray atomization flow,the best liquid pressure constant,influence of variation of airway pressure on atomization angle,penetration distance,flow rate and pressure loss. It could be concluded from the test results,the sector nozzle was superior to the round nozzle and wide-angle circular nozzle;with the increase of the pressure of the spray penetration distance increased first and then decreased;with the increase of the pressure atomization angle was increased first and then decreased;with the air pressure increased,the gas flow increased,but the liquid flow decreased;the gas high pressure loss. The kiwifruit park,was suitable in the 2. 5 bar selection pressure,selection of fan nozzle,which laid the foundation for the study of gas-liquid flow type variable spray.