Characterizing center pivot irrigation with fixed spray plate sprinklers  

作　　者：YAN HaiJun1,JIN HongZhi2 & QIAN YiChao2 1 College of Water Conversancy and Civil Engineering,China Agricultural University,Beijing 100083,China 2 Institute of Drainage and Irrigation Machinery,Chinese Academy of Agricultural Mechanization and Sciences,Beijing 100083,China 

出　　处：《Science China(Technological Sciences)》2010年第5期1398-1405,共8页中国科学（技术科学英文版）

基　　金：supported by the China Key Technological Special Project of National Tenth Five-Year Plan (Grant No.2002AA2Z4161);Program for Changjiang Scholars and Innovative Research Team in University (Grant No.IRT0657);Program for Beijing Key Subject of Hydrology and Water Resources

摘　　要：An indoor experiment with a fixed spray plate sprinkler(FSPS) of 36-grooved plate D3000 was conducted to evaluate the discharge-pressure relationship,wetted diameter,effective width,and water application rate in this research.In addition,a field experiment with a center pivot system equipped with the same measured FSPS was carried out to investigate the radial and circular uniformity under different cycle times and settings of the percent-timer.A package of nozzles numbering from #9(1.79 mm) to #33(6.55 mm) was tested with a nozzle elevation of 1.2 m and a 20-psi pressure regulator.The results showed that the wetted diameter and average application rate increased with nozzle size,but the effective wetted width and peak instantaneous application rate had no significant relationship with nozzle size.The simulated application rate of the center pivot system using the measured water distribution data of single FSPS was in good agreement with the measured result,which verified that the improved measurement procedure and modified nozzle sizing equation of the D3000 sprayhead in this paper were correct.Reducing the percent-time cycle time from 60 s to 40 s resulted in a slight increase in the radial uniformity coefficients,with an average of 1.09% to 1.17%,while there was no significant influence on the circular uniformity coefficients.An indoor experiment with a fixed spray plate sprinkler(FSPS) of 36-grooved plate D3000 was conducted to evaluate the discharge-pressure relationship,wetted diameter,effective width,and water application rate in this research.In addition,a field experiment with a center pivot system equipped with the same measured FSPS was carried out to investigate the radial and circular uniformity under different cycle times and settings of the percent-timer.A package of nozzles numbering from #9(1.79 mm) to #33(6.55 mm) was tested with a nozzle elevation of 1.2 m and a 20-psi pressure regulator.The results showed that the wetted diameter and average application rate increased with nozzle size,but the effective wetted width and peak instantaneous application rate had no significant relationship with nozzle size.The simulated application rate of the center pivot system using the measured water distribution data of single FSPS was in good agreement with the measured result,which verified that the improved measurement procedure and modified nozzle sizing equation of the D3000 sprayhead in this paper were correct.Reducing the percent-time cycle time from 60 s to 40 s resulted in a slight increase in the radial uniformity coefficients,with an average of 1.09% to 1.17%,while there was no significant influence on the circular uniformity coefficients.

关 键 词：fixed SPRAY SPRINKLER IRRIGATION CENTER PIVOT percent-timer uniformity 

分 类 号：S277.94[农业科学—农业水土工程]