Abstract：The differences between the forward and backwardstepping process of the twoway stepping fluidic sprinkler of type PXSB50 were analyzed to study the stability of the sprinkler. The gasliquid twophase flow in the pipes for controlling forward and backwardstepping process was studied and the pressure difference in the pipes was compared. The length of the deriving fluid tube, the size and position of the air compensating hole have influence on forward or backwardstepping frequency and angle, spraying range. The frequency was increased but the spraying range was with reducing length. For the same length, the forwardstepping frequency was considerably higher than the backwardstepping frequency; accordingly the spraying range in the forwardstepping process was smaller than that in the backwardstepping process. The closer the air compensating hole was placed to the reversing mechanism, the faster the stepping frequency becomes, and the smaller both the stepping angle and the spraying range get. For the twoway stepping fluidic sprinkler of type PXSB50, an optimum combination of the length of the deriving fluid tube, the size and position of the air compensating hole was obtained by theoretical analysis and experiment, those parameters as follows: the length of the deriving fluid tube 378 mm, the length of the forwardstepping pipe 648 mm, the length of the backwardstepping pipe 648 mm, the diameter of the forwardstepping air compensating hole is 2.0 mm, the diameter of the backwardstepping air compensating hole is 25 mm, the position of the forwardstepping air compensating hole is 3 mm.
参考文献(References)［1］谢福祺,李红,汤跃,等.全射流喷头:中国,03222424 ［P］.2004-12-01.［2］李红,杨炎财,向清江,等.PXSB型双向步进式全射流喷头的原理及结构设计［J］.排灌机械,2008,26(5):59-63.Li Hong,Yang Yancai,Xiang Qingjiang,et al.Theory and structure design of twoways step running complete fluidic sprinkler of PXSB type［J］.Drainage and Irrigation Machinery,2008,26(5):59-63.(in Chinese)［3］Li Hong,Yuan Shouqi,Xiang Qingjiang,et al.Theoretical and experimental study on water offset flow in fluidic component of fluidic sprinklers［J］.Journal of Irrigation and Drainage Engineering,2011,137(4)：234-243.［4］Wang Chao,Li Hong,Chen Chao,et al.The study of the dynamic switching of fluidic component on the fluidic sprinkler［C］//Proceedings of ASMEJSMEKSME Joint Fluids Engineering Conference.Hamamatsu, Japan: ［s.n.］, 2011.［5］Zhu Xingye,Yuan Shouqi, Li Hong. Numerical simulation for complete fluidic sprinkler［C］//2009 Second International Conference on Information and Computing Science (ICIC 2009). Manchester, England:［s.n.］，2009.［6］李红,袁寿其,谢福琪,等.隙控式全射流喷头性能特点及与摇臂式喷头的比较研究［J］.农业工程学报,2006,22(5):82-85.Li Hong,Yuan Shouqi,Xie Fuqi,et al.Performance characteristics of fluidic sprinkler controlled by clearance and comparison with impact sprinkler［J］.Transactions of the CSAE,2006,22(5):82-85.(in Chinese)［7］李红,袁寿其,向清江,等.基于附壁射流理论的全射流喷头射流元件设计［J］.江苏大学学报:自然科学版,2009,30(3):274-278.Li Hong,Yuan Shouqi,Xiang Qingjiang,et al.Design of fluidic sprinklers jet component based on offset jet theory［J］.Journal of Jiangsu University:Natural Science Edition,2009,30(3):274-278.(in Chinese)［8］严海军,刘竹青,王福星,等.我国摇臂式喷头的研究与发展［J］.中国农业大学学报,2007,12(1):77-80.Yan Haijun,Liu Zhuqing,Wang Fuxing,et al.Research and development of impact sprinklers in China［J］.Journal of China Agricultural University,2007,12(1):77-80.(in Chinese)［9］李红,王超,杨炎财,等.双向步进式全射流喷枪水力性能试验［J］.农业机械学报,2011,42(3):91-95.Li Hong,Wang Chao,Yang Yancai,et al. Experiment of PXSB twoway step running complete fluidic rain gun［J］.Transactions of the Chinese Society of Agricultural Machinery,2011,42(3):91-95.(in Chinese)［10］孔珑.两相流体力学［M］.北京:高等教育出版社. 2000:119-177.［11］李红.隙控式全射流喷头理论及试验研究［D］. 镇江:江苏大学流体机械工程技术研究中心,2007.
