双流体喷嘴雾化控制特性研究
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摘要
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.
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.
引文
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[2]陈波,高殿荣,杨超,等.基于PDPA的双流体撞击式喷嘴雾化特性研究[J].农业机械学报,2017,48(4):362-369.
[3]方立军,尹荣荣,胡月龙.单相/双相压力型喷嘴雾化特性实验研究[J].华北电力大学学报,2014,41(3):89-93.
[4]王晓英,罗惕乾,沙毅,等.双流体喷嘴荷电雾化特性[J].江苏大学学报:自然科学版,2007,28(4):328-331.
[5]王贞涛,岑旗钢,宋晓宁,等.双流体核电雾化的PDA实验[J].农业机械学报,2008,39(10):80-84.
[6]岳朴杰,张忠孝,毕德贵,等.双流体气流式喷嘴加压雾化特性研究[J].洁净煤技术,2014,20(1):74-77.
[7]玄子玉,杨方,刘立意.基于单片机的变量喷雾控制系统的设计[J].东北农业大学学报,2009,40(8):110-112.
[8]王贞涛,岑旗钢,罗惕乾.双流体喷嘴雾化特性实验[J].化学工程,2010,38(2):26-30.
[9]卢平,梁晓萍,章明耀.双流体喷嘴雾化特性的试验研究[J].南京师范大学学报:工程技术版,2008,8(1):34-37.