螺旋流起旋器内部流场水力特性数值模拟与验证  

Numerical simulation and verification of hydraulic characteristics of internal flow field in spiral flow generator

作　　者：张春晋 孙西欢[1,2] 李永业[1] 张学琴 Zhang Chunjin;Sun Xihuan;Li Yongye;Zhang Xueqin(School of Hydro Science & Engineering, Taiyuan University of Technology, Taiyuan 030024, China;Jinzhong University, Jinzhong 030600, China;Zhangqiu Yellow River Bureau, Jinan 250200, China)

机构地区：[1]太原理工大学水利科学与工程学院,太原030024 [2]晋中学院,晋中030600 [3]章丘黄河河务局,济南250200

出　　处：《农业工程学报》2018年第1期53-62,共10页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(51179116;50579044;51109155);山西省自然科学基金项目(2015011067;201701D221137)

摘　　要：为了有效解决低压平直管道在田间长距离调水中泥沙淤积问题,该文设计了一种螺旋流起旋装置:螺旋流起旋器。与传统的起旋装置相比,螺旋流起旋器的导叶被固定在与管道保持同心状态的料筒外壁面。该文基于RNG k-ε湍流模型,采用Fluent 12.0对不同导叶长度条件下螺旋流起旋器内部流场水力特性进行了非定常数值模拟,并将模拟值与试验值对比分析,结果表明:螺旋流起旋器内部流场模拟值与试验值基本吻合,且流速场和压力场的最大相对误差分别不超过6.4%和1.3%,进一步表明采用Fluent数值模拟求解螺旋流起旋器内部流场是可行的;随着导叶长度的增加,螺旋流起旋器下游流场的轴向流速的影响区域将逐渐减小,而径向流速、周向流速及涡量的影响区域将逐渐增大;螺旋流起旋器能耗损失与起旋效率均随着导叶长度的增加呈现出增大的变化趋势;螺旋流起旋器内部流场涡量主要分布于料筒近壁面、导叶近壁面及螺旋流起旋器的下游流场。该研究不仅为螺旋流起旋器的设计与优化提供了参考依据,同时还为进一步完善管道螺旋流长距离输固理论提供了坚实的理论基础。Low-pressure straight pipeline was usually used to transport sediment-laden flow in the traditional field irrigation.Sediment deposition often triggered pipe blockage and affected normal run of the fluid-conveying pipeline.In order to effectively solve the problem of pipe blockage caused by sediment deposition during a long-distance inter-field water transfer process of the low-pressure straight pipeline,this paper designed a kind of spiral flow generating device:A hydro-spiral generator.Compared with the traditional spiral flow generating device,the guide vanes were fixed on the exterior surface of the barrel which always maintained concentric with the fluid-conveying pipeline.The hydro-spiral generator works by producing reverse resistance and vertical lift on the fluid under the action of the guide vanes,and forming a stable velocity circulation and a spiral flow of uniform vortex strength within the pipeline.The supports made it more flexible to arrange the hydro-spiral generator at any position and greatly enhanced the intensity and scope of continuous generating spiral,which was significant in improving irrigation efficiency of sediment-laden flow in the field irrigation.In order to rationally design structural parameters of the hydro-spiral generator,a geometrical model of the hydro-spiral generator with different guide vane lengths was established by using Auto CAD(computer aided design)software.Based on RNG k-εturbulent model and PISO algorithm,hydraulic characteristics such as the axial velocity,the radial velocity,the circumferential velocity,the pressure and the vorticity magnitude inside the hydro-spiral generator having different guide vane lengths were investigated numerically with three-dimensional unsteady calculation by using the commercial Fluent12.0software.At the same time,the spiral generating efficiency was deduced to further analyze the effects of the guide vane length on spiral generating capability.The hydraulic characteristics of internal flow field were studied by using model tests in

关 键 词：灌溉 流场 数值分析 低压管道 起旋器 螺旋流 起旋效率 导叶 

分 类 号：TV135[水利工程—水力学及河流动力学] TP216[自动化与计算机技术—检测技术与自动化装置]