排灌机械工程学报
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排灌机械工程学报  2012, Vol. 30 Issue (5): 588-591    DOI: 10.3969/j.issn.1674-8530.2012.05.019
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自清洗网式过滤器排污流量的计算
 骆秀萍, 刘焕芳, 宗全利, 易平
(1.石河子大学水利建筑工程学院, 新疆 石河子 832003; 2.新疆生产建设兵团勘测规划设计研究院, 新疆 乌鲁木齐 832000)
Calculating drainage flow rate through selfcleaning screen filters
 LUO  Xiu-Ping, LIU  Huan-Fang, ZONG  Quan-Li, YI  Ping
(1.College of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832003, China; 2.Survey Planning and Design Institute, Xinjiang Production and Construction Corps, Urumqi, Xinjiang 832000, China)
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摘要 对影响自清洗网式过滤器排污流量大小的因素进行分析,发现过滤器排污流量Qp由流量系数μ决定.为了探讨排污流量系数的变化规律, 主要进行了过滤器吸沙组件相对入流面积对排污流量系数影响的试验研究, 发现流量系数随着吸沙组件相对入流面积的增大而增大,但当相对入流面积增大到一定程度后, 流量系数就不再发生变化, 而是趋近于某一恒定值.建立了排污流量系数关系式,分析排污流量系数关系式发现:当吸沙组件相对入流面积大于015,即当吸沙组件入口长度l大于500 mm后(吸沙组件入口宽度b等于300 mm,为定值),吸沙组件开口面积对排污流量的影响已不到05%,即过滤器排污系数几乎不随吸沙组件开口面积的增加而改变,该变化规律与试验所作出的分析结果定性一致.根据排污流量系数关系式,进而建立了自清洗网式过滤器排污流量计算公式,对建立的公式进行均方差ERMS检验,得到均方差ERMS为0001 74,说明该公式具有很高的拟合度.
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骆秀萍
刘焕芳
宗全利
易平
关键词微灌   网式过滤器   自清洗   排污系统   流量系数     
Abstract: According to the investigation of the impact factors on the flow rate, it was found that the drainage flow rate through a selfcleaning screen filter Qp is determined by a flow coefficient.In order to investigate variation features of the flow coefficient, a series of experiments were conducted at various dimensionless inlet crosssection areas of the sand suction component in a selfcleaning screen filter. It was observed that the coefficient increases with opening initially. However, once the opening rises to a certain level, the coefficient no longer changes with the opening and tends to arrive at a constant. The established flow coefficient formula showed that when the dimensionless inlet crosssection area is more than 0.15, i.e. the height of the inlet is bigger than 500 mm (in the experiments, the width of the inlet was kept to be 300 mm), the change in the flow coefficient caused by the dimensionless area is less than 0.5%. This suggests the flow coefficient almost no longer depends on the dimensionless inlet crosssection area. Such a theoretical outcome is consistent with the experimental observations. Finally, an empirical formula was proposed to calculate the drainage flow rates through a selfcleaning screen filter based on the flow coefficient established. Interestingly, the root mean square error (RMSE) is 0.001 74  only, showing the formula has an excellent accuracy.
Key words    microirrigation   screen filter   selfcleaning   drainage system   flow coefficient   
收稿日期: 2012-02-27; 出版日期: 2012-09-30
基金资助:

国家自然科学基金资助项目(50909062); 科技型中小企业技术创新基金资助项目(11C26216516530)

通讯作者: 刘焕芳(1965—),男,河南禹县人,教授,博士(通信作者,Lhf0818@shzu.edu.cn),主要从事工程水力学与节水灌溉方面的研究.   
作者简介: 骆秀萍(1986—),女,甘肃武威人,硕士研究生(luoxiuping06@163.com),主要从事工程水力学研究.
引用本文:   
骆秀萍,刘焕芳,宗全利等. 自清洗网式过滤器排污流量的计算[J]. 排灌机械工程学报, 2012, 30(5): 588-591.
LUO Xiu-Ping,LIU Huan-Fang,ZONG Quan-Li et al. Calculating drainage flow rate through selfcleaning screen filters[J]. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(5): 588-591.
 
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