负压反馈射流喷头脉冲特性及其影响规律  

Pulse characteristics and its influence of negative pressure feedback jet sprinkler

作　　者：王新坤[1] 姚吉成 徐胜荣[1] 靳彬彬 丁师伟 Wang Xinkun;Yao Jicheng;Xu Shengrong;Jin Binbin;Ding Shiwei(Fluid Machinery Engineering Technology Research Center,Jiangsu University,Zhenjiang 212013,China;Shandong Taishan Pumped Storage Power Station Co.,Ltd.,Taian 271000,China)

机构地区：[1]江苏大学流体机械工程技术研究中心,镇江212013 [2]山东泰山抽水蓄能电站有限责任公司,泰安271000

出　　处：《农业工程学报》2020年第4期90-97,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(51579116)。

摘　　要：脉冲特性对负压反馈射流喷头的水力性能有着重大影响,也是区别于其他类型灌溉喷头的典型特征,为了系统性研究负压反馈射流喷头的脉冲特性,进一步掌握负压反馈射流喷头的设计方法。该文针对负压反馈喷头的工作原理和喷洒机制进行了深入分析,确定了高频率、高压力振幅的喷头结构优化方向。对影响喷头脉冲特性的主要因素(包括位差比、侧壁倾角和劈距比)及其耦合对脉冲特性的影响分别进行了研究,确定了具有较好脉冲特性的喷头结构参数设计区间,并探究了不同因素对脉冲特性的影响规律。结果表明,脉冲频率随位差比、劈距比变化的减缓转折点分别为位差比0.525、劈距9;压力振幅随位差比增加而增加,增缓转折点为位差比0.450、侧壁倾角,劈距比与压力振幅的关系呈先增后减趋势,增转减转折点分别约为侧壁倾角12°、劈距比9。通过正交试验,采用极差分析法,计算相对影响指数,得到影响喷头脉冲特性的因素主次顺序为:位差比、劈距比、侧壁倾角,提出了最优脉冲结构参数:位差比0.450、侧壁倾角10°、劈距比7。研究可为国产新型负压反馈射流喷头后续优化研究提供参考。The negative pressure feedback jet sprinkler is a new type of irrigation sprinkler independently developed by China.Its design principle is based on the Coanda Effect.Pulse(including pulse frequency and pressure amplitude)is an important feature of the sprinkler,which has a significant impact on the sprinkler's range,rotation characteristics and spray uniformity.At present,the mechanism of its influence on pulse characteristics has not been systematically studied.The main factors affecting the pulse characteristics of the sprinkle are ratio of the shortest distance between inlet and side wall to inlet width(SW),ratio of distance from inlet to concave to inlet width(HW)and sidewall inclination.In this paper,firstly,design interval of the pulse characteristic structure was obtained through 125 sets of numerical simulations.Secondly,by studying the influence of different factors on the pulse characteristics,the effects of main factors on the pulse frequency and pressure amplitude were obtained.The pulse frequency decreased with the increase of SW and HW,and the values of SW at the turning point of the falling rate was 0.525 and 9 respectively;The inclination of the sidewall inclination had little effect on the pulse frequency;The pressure amplitude increased with the increase of SW,and the value of SW at the point where the growth rate became smaller was 0.450.The pressure amplitude increased first and then decreased with the increase of sidewall inclination and HW,and the value of sidewall inclination and HW at the turning point was 12°and 9,respectively.Based on the above studies,a better design interval for the pulse characteristic structure was further determined.Finally,through four-factor three-level orthogonal test,pulse frequency and pressure amplitude were used as evaluation parameters,and range analysis and comprehensive scoring methods were used to obtain the sprinkler structure with optimal pulse characteristics and they were the shortest distance between inlet and side wall of 1.80 mm,the sidewall incl

关 键 词：喷头 压力 数值分析 射流 脉冲频率 正交试验 

分 类 号：S277.94[农业科学—农业水土工程]