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): 180-184    DOI: 10.3969/j.issn.1674—8530.2011.02.018
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轻小型喷灌机组逐级阻力损失水力计算
朱兴业, 蔡 彬, 涂 琴
(江苏大学流体机械工程技术研究中心, 江苏 镇江 212013)
Head loss hydraulic calculation step by step for light and small sprinkler irrigation system
Zhu Xingye, Cai Bin, Tu Qin
(Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China)
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摘要 为了解决精确计算轻小型喷灌机组阻力损失的问题,从管路中流体力学机理出发,对其进行了分析;将机组布置成线型,根据构成特点与运行特性,采用逐级计算方法对其进行水力计算,计算过程中将任意两喷头间的总水头损失简化为其输水管路沿程损失乘上经验系数,推导出喷灌机组中各喷头工作压力的计算公式,确定逐级阻力损失的计算方法.结合一个算例,选择型号为65ZB-40C&12×PY120的喷灌机组进行室外试验对比,理论计算时经验系数取为1.1,试验时保证该喷灌泵在其设计工况点运行,多次测量计算出的平均值作为最终的试验数据.计算值与试验值的对比结果表明:在管路流动中,随着流量沿程减小,各喷头工作压力在管路首端时相差较大,末端时基本保持一致.绘制了喷头工作压力的理论计算值与试验值的误差条线图,通过计算得出绝对误差最大的是3号喷头,它们的相对误差在0.27%~1.96%范围内.
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朱兴业
蔡 彬
涂 琴
关键词水头损失   水力计算   轻小型喷灌机组   室外试验   喷头     
Abstract: To overcome the accurate calculation problems for head loss of light and small sprinkler irrigationsystem, the related issues were discussed based on the basic fluid mechanism. Arranged in a line type unit, hydraulic calculation of the system was carried out step by step based on the structure and operating characteristics. The total head loss between two sprinklers was simplified as loss along the pipe multiplying experience coefficient. The formulas of sprinkler operating pressure in the system were derived. The calculation methods for head loss of the system were proposed. An example was presented to illustrate the application of the formula, and the units typed 65ZB-40C&12×PY120 were set up for the outdoor tests. The experience coefficient was chosen 1.1 for the theoretical calculation, and 65ZB-40C pump was ensured operating in its design point. The results show that the flux were reduced along with the pipe, the sprinkler operating pressure keep reduction and stable in the first and end sides, respectively. Error bars of experimental and theoretical results were figured out. After calculation, the biggest absoluteerror happened in the sprinkler number 3 and the relative error between them were within 0.27%-1.96%.
Key wordshead loss   hydraulic calculationl   ight and small sprinkler irrigation system    outdoor tests   sprinkler head   
收稿日期: 2010-06-18; 出版日期: 2011-03-30
基金资助:

国家863 计划项目( 2006AA100211,2011AA100506)

通讯作者: 朱兴业( 1982-),男,浙江永康人,博士后( zhuxy@ujs.edu.cn)主要从,事流体机械及排灌机械研究.   
作者简介: 蔡 彬(1960-),男,江苏镇江人,副研究员( cb302@ ujs.edu.cn) ,主要从事流体机械及工程研究.
引用本文:   
朱兴业,蔡 彬,涂 琴. 轻小型喷灌机组逐级阻力损失水力计算[J]. 排灌机械工程学报, 2011, 29(2): 180-184.
ZHU Xing-Ye,CAI Bin,TU Qin. Head loss hydraulic calculation step by step for light and small sprinkler irrigation system[J]. Journal of Drainage and Irrigation Machinery Engin, 2011, 29(2): 180-184.
 
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