排灌机械工程学报
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排灌机械工程学报  2011, Vol. 29 Issue (2): 175-179    DOI: 10.3969/j.issn.1674—8530.2011.02.017
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滴头制造偏差对灌水均匀度及毛管造价的影响
朱德兰1, 吴普特1,2, 王 剑2
(1.西北农林科技大学中国旱地节水农业研究院, 陕西 杨凌712100; 2.西北农林科技大学资源环境学院, 陕西 杨凌 712100)
Effect of emitters manufacturing variation of micro-irrigation on uniformity and lateral cost
Zhu Delan1, Wu Pute 1,2, Wang Jian1
(1.China Arid area Water saving Agricultural Institute, Northwest Agriculture and Forestry University, Yangling, Shaanxi 712100, China; 2.College of Resources and Environment,Northwest Agriculture and Forestry University, Yangling, Shaanxi 712100, China)
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摘要 为了阐明滴头制造偏差系数、灌水均匀度、毛管直径及毛管造价的内在联系,降低滴灌系统造价、提高灌水均匀度,通过理论推导结合实证计算的方法,系统分析了不同均匀度条件下滴头制造偏差系数极限值,以及滴头制造偏差系数、毛管直径、允许均匀度等三者的关系,并推导出毛管造价计算公式.结果表明:对于长度为100 m的毛管,当Keller均匀系数( EEU)为0.80时,制造偏差系数从0.05增大到0.07和0.11时,毛管造价分别增大8.7%和37.1%;当滴头制造偏差系数为0.03, EEU由0.80增大到0.85,0.90和0.95时,毛管直径分别增大20%,23.5%和56.5%,毛管造价也相应增大20%,53.8%和207.7%;当滴头制造偏差系数为0.05, EEU由0.80增大到0.85和0.90时,毛管直径则分别增大19.3%和32.8%,毛管造价也分别增大17.1%和71.4%;对于 EEU为0.95时,毛管允许最小流量大于平均流量,管径计算无解.在限定值范围内,滴头制造偏差系数和Keller均匀系数的微小增大将直接导致毛管直径和造价急剧增大;滴灌系统设计应选择制造偏差系数小的滴头及合理的灌水均匀度,以达到降低工程造价的目的.
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朱德兰
吴普特
王 剑
关键词滴头   制造偏差系数   水力流量偏差率   灌水均匀度   毛管造价     
Abstract: In order to find the relationship among the emitter manufacturing variation coefficient, the  lateralcost and the lateral diameter, and to decrease the cost of drip irrigation engineering the allowable values of the emitters manufacturing variation coefficient are analyzed for different emission uniformity coefficients(EEU). Then, the relationship among the esmitters manufacturing variation coefficient, lateral diameter,and the  EEUis investigated.The function of the lateral cost is also parameterized.An application illustration shows that the pipe cost increases by 8.7% and 37.1% when the emitters manufacturing variationcoefficients increase from 0.05 to 0.07 and 0.11, respectively, for the lateral length of 100 m and  EEUof 0.80. When the  EEUincreases from 0.80 to 0.85, 0.90 and 0.95, the lateral diameter increasesby 20%,23.5% and 56.5% and lateral cost increases by 20%,53.8% and 207.7%, respectively, for the emitters manufacturing variation coefficient of 0.03. For the emitters manufacturing variation coefficient of 0.05, when  EEUincreases from 0.80 to 0.85, 0.90, the lateral diameter increases by 19.3% and 32.8%, and lateral cost increased by 17.1% and 71.4%, respectively. In addition, when the  EEUis 0.95, the hydraulic calculation cannot be performed, because the allowable hydraulic variation is negative. It is concluded that the lateral diameter and cost increase significantly with increasingthe emitters manufacturing variation coefficient and the given uniformity coefficient. Furthermore, when the emitters manufacturing variation coefficient or the emission uniformity coefficient is larger than a preset value, the hydraulic design can not be carried out.
Key wordsemitters   manufacturing variation coefficient   hydraulic flow variation    uniformity coefficient   pipe cost   
收稿日期: 2010-01-08; 出版日期: 2011-03-30
基金资助:

国家863 计划项目( 2010AA10A302) ; 高等学校学科引智计划( 111-2-16)

通讯作者: 吴普特( 1963-),男,陕西杨凌人,教授,博士( 通信作者,gjzwpt@ vip.sina.com),主要从事水资源高效利用研究.   
作者简介: 朱德兰( 1969-),女,陕西杨凌人,教授,博士( dlzhu@126. com),主要从事水资源高效利用研究.
引用本文:   
朱德兰,吴普特, 王 剑. 滴头制造偏差对灌水均匀度及毛管造价的影响[J]. 排灌机械工程学报, 2011, 29(2): 175-179.
ZHU De-Lan,WU Pu-Te, Wang- Jian. Effect of emitters manufacturing variation of micro-irrigation on uniformity and lateral cost[J]. Journal of Drainage and Irrigation Machinery Engin, 2011, 29(2): 175-179.
 
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