摘要
为了获得痕灌带在田间应用的设计参数及其水力性能,通过室内与室外试验相结合的方法,针对流量规格为900 m L/h的痕灌带在自由出流时的制造偏差系数、流量与压力关系及其地埋后的水力特性以及痕灌毛管的地埋极限铺设距离进行了计算与评估.试验结果表明,试验痕灌带制造偏差系数为0. 04,制造精度较高,且痕量灌水器压力-流量关系符合微灌灌水器幂函数关系式;痕量灌水器在地埋条件下,流量对压力变化的敏感性要高于自由出流.痕灌带(900m L/h)在地埋后其流量减小幅度不明显,与室内自由出流相比,在额定工作压力条件下(10 m),地埋后痕量灌水器平均流量减少3%～8%;此外,在满足系统流量偏差系数(qv)不大于20%条件下,并结合田间土壤含水率空间变异性的研究验证,试验痕灌带(900 m L/h)在平坡铺设、砂壤土中的地埋铺设极限距离为150 m左右.
The main objective of this research is to obtain the design parameters and hydraulic perfor-mance of the trace drip tape in the field.The hydraulic performance of the trace drip tape,characterized with the discharge of 900 mL/h,was evaluated by laboratory and field trials.The results reveal that the manufacturing deviation coefficient of the test tape is 0.04,and the relationship between the pressure and the discharge of the trace drip emitter is in accord with the function used for traditional drip emitter.The discharge rate of the trace emitter under the buried condition is more sensitive to the pressure change compared with that under surface free flow condition,and the decrement of discharge is not obvious when the trace drip tape is buried in field,and the average discharge rate of buried trace emitter under nominal working pressure(10 m)is reduced by 3%-8%.In addition,when the flow rate deviation coefficient of drip irrigation system is less than 20%,and combined with research results concerning spatial variability of soil moisture in the field,the limit laying distance of the trace drip tape is about 150 m used for subsurface drip irrigation.
作者
杨彬
赵月芬
陈晏育
王海涛
莫彦
王建东
YANG Bin;ZHAO Yuefen;CHEN Yanyu;WANG Haitao;MO Yan;WANG Jiandong(Irrigation and Drainage Department,China Institute of Water Resource and Hydraulic Research,Beijing 100048,China;Beijing IWHR Corporation,Beijing 100048,China)
出处
《排灌机械工程学报》
EI
CSCD
北大核心
2018年第12期1317-1322,共6页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家"十二五"科技支撑计划项目(2014BAD12B06)
中国水科院基本科研业务费资助项目(ID0145B602017)
国家重点研发计划项目(2016YFC0400105)
关键词
痕灌带
自由出流
地下滴灌
水力特性
铺设距离
trace drip tape
free flow
subsurface drip irrigation
hydraulic performance
laying distance
