膜片对压力补偿灌水器水力性能影响及内部流固耦合模拟  

Influence of elastic diaphragm on hydraulic performance of pipe-type pressure compensating emitter and simulation of internal fluid structure interaction

作　　者：徐耀 苏艳平[1] 杨培岭[1] 任树梅[1] XU Yao;SU Yanping;YANG Peiling;REN Shumei(College of Water Resources and Civil Engineering,China Agricultural University,Beijing 100083,China)

机构地区：[1]中国农业大学水利与土木工程学院,北京100083

出　　处：《排灌机械工程学报》2020年第7期743-750,共8页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51879263);内蒙古自治区重大水利科技专项(2014-117)。

摘　　要：为了研究弹性膜片参数对管上式压力补偿灌水器水力性能的影响和内部补偿腔压力补偿原理,以Supertif-03120-0003型号的压力补偿灌水器为原型件,通过3D打印技术制作管上式灌水器试验件,测试入口压力为0~350 k Pa时的压力-流量曲线,分析弹性膜片(天然橡胶材质)的厚度与硬度对其水力性能的影响;借助ADINA软件,采用流固耦合的计算方法,分析了压力补偿灌水器内部补偿原理及水力性能.结果表明:弹性膜片厚度一定,随着硬度增加,灌水器的出流量和起调压力均呈现增大的趋势;弹性膜片硬度一定,随着厚度增加,灌水器的出流量和起调压力均呈现增大的趋势,在起调压力点之后,灌水器出流量的增长速率减慢,最终压力-流量曲线趋于平缓.在此灌水器内部结构下,膜片参数存在最优选择,即厚度为1.4 mm,硬度为50HA;压力-流量关系的数值模拟值与实测值比较接近,两者最大偏差小于5%,说明采用ADINA软件模拟得出的压力-流量关系与实测值具有较好的一致性.该方法为压力补偿灌水器的进一步研发提供了可视化途径.In order to study the influence of elastic diaphragm parameters on the hydraulic performance of pipe-type pressure compensating emitter and the internal compensating principle of compensation pressure chamber,the pressure compensating emitter of type supertif-03120-0003 was used as the prototype and a pipe-type emitter experimental model was fabricated with 3D printing.The pressure-flow curve of the model was measured at inlet pressures ranged in 0-350 kPa.The effects of thickness and hardness of the natural rubber elastic diaphragm on the hydraulic performance of the emitter were analyzed.A fluid-structure interaction(FSI)analysis on the compensating principle and hydraulic performance in the emitter was launched in ADINA software.The results show that when the thickness of the elastic diaphragm is constant,the discharge flow and compensating threshold pressure of the emitter all increase with increase of the elastic diaphragm hardness.When the hardness is fixed,the discharge flow and compensating threshold pressure both show an increasing trend with increase of the thickness.The growth rate of the emitter discharge flow is decreased beyond a threshold pressure,and finally the pressure-flow relationship curve tends to be flat.For this internal structure of the emitter,the elastic diaphragm is subject to an optimal combination of hardness and thickness,namely thickness 1.4 mm,hardness 50HA.The predicted pressure-flow curve is in good agreement with the measured value,and the maximum deviation between them is less than 5%,indicating that ADINA software is proper in FSI analysis of compensating principle and hydraulic performance for the emitter.This method has provided a visualization way for research and development of emitters with pressure compensation.

关 键 词：压力补偿灌水器 水力性能 弹性膜片 数值模拟 流固耦合 

分 类 号：S275.6[农业科学—农业水土工程]