基于FLUENT的农业灌溉管路微型水轮机发电效率的分析与研究  

Analysis and Research on Power Generation Efficiency of Micro-turbine in Agricultural Irrigation Pipeline Based on FLUENT

作　　者：李杰 翁泽城 潘鹤立 LI Jie;WENG Ze-cheng;PAN He-li(Department of Smart Agriculture,College of Horticulture,Fujian Agriculture and Forestry University,Fuzhou 350002,China)

机构地区：[1]福建农林大学园艺学院智慧农业系,福州350002

出　　处：《节水灌溉》2023年第8期129-135,142,共8页Water Saving Irrigation

基　　金：2021年福建省教育厅年中青年自然科学基金项目“基于超微型水轮发电机的智能电磁阀系统的研究”(JAT210068);2022年福建农林大学园艺学院青年学术骨干培养基金项目“智能灌溉系统管道水利供电系统”(722022011)。

摘　　要：为了实现管道中水能发电满足智能灌溉系统供电需求,需要提高超微型水轮机的发电量和发电效率。使用DesignModeler和Soildworks建立了三维结构模型,将水轮机转轮不同的叶片数量和叶片角度分组并导入流体力学仿真软件Fluent中分析。根据灌溉用水特点,设置在水压150kPa,水流速度1.33m/s的条件下进行仿真实验。在稳定旋转的条件下,分别对6、10、20、25、30叶片数和夹角60°、70°、75°、80°、90°的叶轮模型稳定后的转速进行仿真试验,发现在叶片夹角75°下,20和25片叶片时水轮机转速较快,分别为1185 r/min和1148 r/min。经过仿真试验,发现叶轮转速与其叶片长度的关系不明显。对有效输出功率和流场进行分析,发现当水轮机叶片为25片,夹角为75°时,为仿真实验中的最优组合。叶片数在6~20片时转速随着叶片数量增加而增加,20~30片则会骤降,叶片的角度在75°时转速最高,叶片长度对转速影响不大。研究结果表明通过调整其转轮数量和叶片角度对叶轮转速有明显提升,能有效提高输出功率,提高发电效率。In order to realize the use of hydropower in pipelines to meet the power supply needs of intelligent irrigation systems,it is necessary to improve the power generation and power generation efficiency of ultra-micro turbines.This study used Design Modeler and Soildworks to build a three-dimensional structural model,grouped different blade numbers and blade angles of the hydraulic turbine runner and imported them into the fluid dynamics simulation software Fluent for analysis.According to the characteristics of irrigation water,the simulation experiment was conducted under the conditions of water pressure of 150 kPa and water flow speed of 1.33 m/s.Under the condition of stable rotation,the simulation tests were carried out on the stabilized rotational speed of the impeller models with blade numbers of 6,10,20,25,30 and angles of 60°,70°,75°,80°and 90°,respectively.It was found that under the angle of 75°,the rotational speed of the turbine with 20 and 25 blades was faster,as 1185 r/min and 1148 r/min,respectively.Through simulation test,it was found that the relationship between impeller speed and blade length was not obvious.Through the analysis of the effective output power and flow field,it was found that the optimal combination in the simulation experiment was 25 blade number with 75°angle.It is concluded that when the number of blades is 6~20,the rotational speed increases with the increase of the number of blades,while it will drop sharply under 20~30 blades;when the angle of the blade is 75°,the rotational speed is the highest;the blade length has little effect on the rotational speed.Through adjusting the number of runner and the angle of blade,the speed of impeller can be significantly improved,the output power can be effectively increased and the power generation efficiency can be improved.

关 键 词：FLUENT 超微型水轮机 智能灌溉 管道水流发电 叶片数量 叶片角度 发电效率 

分 类 号：S275[农业科学—农业水土工程]