| 虚拟节点有限元法解析滴灌毛管水力特性 |
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| 引用本文： | 张志新,王建东,徐锁军,李淑芹. 虚拟节点有限元法解析滴灌毛管水力特性[J]. 农业机械学报, 2009, 40(2) |
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| 作者姓名： | 张志新 王建东 徐锁军 李淑芹 |
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| 作者单位： | 中国农业大学现代精细农业系统综合研究重点实验室,北京,100083;中国水利水电科学研究院水利研究所,北京,100044;北京市水利水电技术中心,北京,100073 |
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| 基金项目： | 国家自然科学基金，国家重点基础研究发展规划(973计划) |
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| 摘 要： | 滴灌毛管水力学计算是滴灌系统设计的重要组成部分.利用有限元法和虚拟节点有限元法对滴灌毛管进行了水力学解析.结果表明,与有限元法相比,随着虚拟节点数的减少,虚拟节点有限元法和虚拟节点平均水头损失有限元法计算结果误差增大,但通过合理选择虚拟单元个数,可达到与多口系数法相同的计算精度,在满足实际滴灌工程设计需要的同时可以显著减少单元数量,从而减少计算量,其中虚拟节点法减少95%,虚拟节点平均水头损失法减少98%.
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| 关 键 词： | 滴灌 毛管 水头损失 有限元 虚拟节点 水力计算 |
Finite Element Method for Hydraulic Design of Drip Irrigation Lateral Lines with Virtual Emitter System |
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| Zhang Zhixin,Wang Jiandong,Xu Suojun,Li Shuqin. Finite Element Method for Hydraulic Design of Drip Irrigation Lateral Lines with Virtual Emitter System[J]. Transactions of the Chinese Society for Agricultural Machinery, 2009, 40(2) |
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| Authors: | Zhang Zhixin Wang Jiandong Xu Suojun Li Shuqin |
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| Affiliation: | 1.Key Laboratory of Modern Precision Agriculture System Integration Research;China Agricultural University;Beijing 100083;China 2.Irrigation and Drainage Department;China Institute of Water Resources and Hydropower Research;Beijing 100044;China 3.Beijing Water Technology Center;Beijing 100073;China |
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| Abstract: | The hydraulic performance of lateral lines plays an important role in the drip irrigation system design.The virtual emitters and finite element method were used to compute the head loss and the way to reduce computational errors was suggested by selecting certain amounts of elements in order to meet the need of drip irrigation design.Moreover,virtual emitter with finite element method could dramatically reduce element number needed so as to reduce computational efforts and storage demands by 95 and 98 perce... |
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| Keywords: | Drip irrigation Lateral line Hydraulic head loss Finite element Virtual emitter Hydraulic calculation |
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