农业工程学报2012，Vol.28Issue(1)：78-81,4.DOI:10.3969/j.jssn.1002-6819.2012.01.015
对微灌滴头水流流态若干问题的思考及补偿机理的探索
Some problems of water flow pattern and compensation mechanism for micro-irrigation emitters
张国祥 1丁苏疆1
作者信息
- 1. 新疆泓科节水设备制造有限公司,乌鲁木齐830000
- 折叠
摘要
Abstract
Hydraulic calculation of micro-irrigation emitters is important for pipeline engineering design. Classified basis of water flow pattern and the flow condition of pressure pipes, the differences of the operating head of drip emitters and frictional head loss flow modification, and water temperature modification of dripper discharge were studied. Then the reason for flow stance index x<0.5 observed in hydraulic measured data of inelasticity elements was analyzed, and the method of area compensation was proposed. Results show that: 1) it's wrong that the water flow pattern in pressure pipes based on Nituradse's experimental results were applied in hydraulic calculation of micro-irrigation emitters except for microtubule drippers; 2) water temperature modification of drippers should be done for flow stance index x=l, not for jt< 0.5 not because flow state is at drag square area but because loss of pipes are presented as local loss and not for 1 >jc>0.5 respectively. The hydraulic relationship at different water temperature can be got by hydraulic experiments at corresponding water temperature for drippers of 1 >x>0.5; 3) the way of classifying water flow pattern of drippers should be abandoned because this way just suitable for microtubule drippers cannot be applied for others; and 4) the reason for x<0.5 of is area compensation effect, which means the area of passage decreased with water head increased, because of rapid changes for flow channel boundary and a positive correlation between the flow inertia and the water head.关键词
灌溉/水力学/流量/补偿/微灌滴头/流态/水温修正/无弹性件Key words
irrigation/hydraulics/flow/compensation/micro-irrigation emitters/the flow pattern/water temperature modification/inelasticity elements分类
农业科技引用本文复制引用
张国祥,丁苏疆..对微灌滴头水流流态若干问题的思考及补偿机理的探索[J].农业工程学报,2012,28(1):78-81,4.
