弹性喷嘴变量喷头结构设计与参数模型  

Configuration Design and Parameter Model for Flexible Nozzle of Variable-rate Sprinkler

作　　者：刘文帅[1] 韩文霆[2] 姚小敏[1] 崔利华[1] 张小波[1] 

机构地区：[1]西北农林科技大学机械与电子工程学院,陕西杨凌712100 [2]西北农林科技大学水土保持研究所,陕西杨凌712100

出　　处：《农业机械学报》2013年第12期80-86,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(51079140);'十二五'国家科技支撑计划资助项目(2011BAD29B08);高等学校学科创新引智计划资助项目(B12007)

摘　　要：设计了一种弹性喷嘴的变量喷头,其喷嘴直径随压力的增大而变大,从而降低喷头的雾化程度。为研究确定弹性喷嘴锥形角、喷嘴直径、末端圆柱段长度、弹性材料厚度和喷嘴伸出量等主要参数,利用ANSYS建立了变量喷头及其内流道的三维实体模型,采用k-ε模型在CFX和ANSYS单向流固耦合中模拟喷头弹性喷嘴在不同工作压力,不同喷嘴直径组合下的内流道流场和喷嘴的变形过程,建立了工作压力、喷嘴直径变形和喷头流量等参数的关系模型。采用全面喷洒的方法对喷头样品进行了试验,通过测量喷头流量和喷头工作压力等,对模拟结果进行验证。A flexible nozzle of the variable-rate sprinkler was developed. As the pressure increased, the diameter of the flexible nozzle increased and then the degree of fogging reduced. The main parameters of the nozzle, cone angle, range nozzle, length of end cylindrical section, thickness of elastic material, and extended volume of nozzle, were investigated. The 3-D solid model of the flexible variable nozzle and its internal runner were established using ANSYS software. The internal flow field of the flexible nozzle was simulated using computational fluid dynamics （CFD） software with k-8 model and ANSYS software with one-way fluid solid coupling model at different working pressure and different range nozzle. Relationship between working pressure, range nozzle and nozzle flow were evaluated. Simulation results were verified and precision of model was improved by measuring the displacement of the nozzle, the nozzle flow and the working pressure of the produced nozzle samples.

关 键 词：变量喷头 结构设计 参数模型 流场模拟 

分 类 号：S275.5[农业科学—农业水土工程]