| Cite this article: | 李彬,李娜,李端明,等.考虑水头损失的管道灌溉分水口轮灌分组优化模型研究[J].灌溉排水学报,0,():-. |
| Libin,lina,liduanming,et al.考虑水头损失的管道灌溉分水口轮灌分组优化模型研究[J].灌溉排水学报,0,():-. |
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| DOI： |
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| Optimization Model of outlet distribution for Rotation Irrigation in Pipeline Irrigation considering hydraulic loss |
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Libin1, lina2, liduanming2, gongshiwen2
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1.The College of Electrical, Energy and Power Engineering，Yangzhou University;2.China Irrigation and Drainage Development Center
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| Abstract: |
| Abstract: Low pressure pipeline irrigation is a kind of water-saving irrigation technology which uses pressure pipeline instead of water conveyance channel to reduce leakage and evaporation loss in water conveyance process. At present, the irrigation technology of low pressure pipeline Irrigation in China has been developed and mature, which has been developed from the northern dry farming area to the southern paddy field area, from the well irrigation area to the water lifting irrigation area, and from the plain area to the hilly mountain area. The pipeline was transported to the field without occupying farmland, saving valuable land resources, effectively improving the efficiency of irrigation and making effective use of water resources.【Background】With the development of automation technology and the decrease of the cost of control system, the finer the irrigation control, the automatic control of the outlet at the end of irrigation system has been realized. Therefore, it is necessary to carry out hydraulic modeling on the state of different outlets; so as to optimize the control of the state of the outlet according to the optimization object.【Objective】Rotation irrigation is an important irrigation method in irrigation systems in multi-outlet irrigation system. Different irrigation systems will produce the different irrigation results. Therefore, it is necessary to optimize outlet control strategy under the condition of meeting the requirements of flow rate for saving electric energy.【Method】The premise of irrigation optimization is to determine the different hydraulic loss under different outlet states, so the relationship model between different operational states of outlet and pipeline inlet pressure was put forward considering hydraulic loss.The equivalent hydraulic loss coefficient of pipeline inlet was calculated by using outlet state 0 and 1 as independent variable，and the equivalent hydraulic loss coefficient of pipeline inlet was calculated from the end of pipeline by using the deduced recurrence formula.According to the model，the objective function to minimize the power of rotation irrigation was obtained in the optimization of rotation irrigation with fixed flow rate.The genetic algorithm and coding scheme was used to solve the optimization problem. In optimization, the irrigation group number of each water outlet was taken as the optimization variable, thus satisfying the constraint condition that each outlet can only run in one irrigation group.【Result】The optimization results show that the power required for the equal interval arrangement in the rotation irrigation is minimal. The optimization results show that the optimized hydraulic loss coefficient could be reduced to 0.772 times than that before optimization.【Conclusion】In the paper, the recursive formula of hydraulic loss for each outlet takes infinite and bounded parameters into the operation and does not produce singular values. The model can be used in the combination optimization of the constant flow. However, this model is still suitable for the non-equal spacing arrangement of the outlet or the different diameter of the branch pipe. In this case, only the head loss coefficient of each branch pipe can be calculated separately. |
| Key words: rotation Irrigation；hydraulic loss ; model；genetic algorithm |
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