不同正导叶几何参数下多级泵作透平功率-流量曲线研究  

Influence of Positive Guide Vane Geometric Parameters on Power-Flow Curves of Multistage Pump as Turbine

作　　者：王世成 杨军虎[1] 徐国斌 WANG Shicheng;YANG Junhu;XU Guobin(School of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China;School of Environmental and Chemical Engineering,Chongqing Three Gorges University,Chongqing 404100,China)

机构地区：[1]兰州理工大学能源与动力工程学院,兰州730050 [2]重庆三峡学院环境与化学工程学院,重庆404100

出　　处：《农业机械学报》2023年第12期166-172,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金项目(52169019);甘肃省高校产业支撑计划项目(2020C-20);重庆市教委科学技术研究项目(KJQN202301206)。

摘　　要：为适应过程工业中生产调节对液力透平性能的影响,要求多级泵作透平的输出功率随流量的变化较小,即输出功率-流量曲线较平坦。基于欧拉方程,根据速度矩守恒,推导得到导叶式透平输出功率与几何参数的关系式。利用数学求导,判断出导叶几何参数对输出功率曲线平坦性的影响规律。以两级径向导叶离心泵作透平为研究对象,改变正导叶几何参数设计研究方案,通过Fluent软件数值计算并进行试验验证。研究结果表明:数值计算结果与理论推导相符,适当增大正导叶的喉部面积、出口安放角、叶片数或适当减小正导叶基圆直径都可以使输出功率曲线变平坦;设计工况点正导叶几何参数对功率曲线斜率(平坦性)影响由大到小为喉部面积、出口安放角、叶片数、基圆直径,斜率依次减小0.17、0.11、0.05、0.03;适当增大喉部面积可以使透平效率提升1.65个百分点,高效点向大流量偏移。In the process industry,there are many cases where the residual energy liquid has a highpressure head and low flow rate,it is necessary to use the multistage guide vane centrifugal pump as turbine(PAT)to recover the liquid residual energy.To adapt to the impact of production regulation on the performance of pumps as turbines in the process industry,multistage PAT is required to have a small variation in output power with the flow,i.e.,a flatter output power-flow curve.Based on the Euler equation and according to the retention of the velocity distance,the relationship between the output power and geometrical parameters of the guide vane PAT was derived,the output power was related to the geometrical parameters of the guide vane(throat area,outlet angle,guide vane number,and base circle diameter)and the geometrical parameters of the impeller(blade outlet diameter,outlet width,blade outlet angle,and blade number).Using mathematical derivatives,the influence of geometric parameters of the guide vane on the flatness of the output power curve was determined.A two-stage PAT was used as the object research,and the research scheme was designed by changing the geometric parameters of the positive guide vane,which were experimented with and simulated by Fluent software.The computational results were consistent with the theoretical derivation,the output power curve can be flattened by appropriately increasing the positive guide vane throat area,positive guide vane outlet angle,positive guide vane blades number,or appropriately reducing the positive guide vane base circle diameter;at the design condition point,the order of influence of positive guide vane geometric parameters on the slope of the power curve was throat area,outlet placement angle,blade number,base circle diameter,and the slope of the power curve was reduced by 0.17,0.11,0.05 and 0.03,respectively;a proper increase in throat area can lead to an increase in multistage PAT efficiency by 1.65 percentage points and a shift in the high-efficiency point toward high f

关 键 词：液力透平 多级离心泵 正导叶 功率曲线 

分 类 号：TH311[机械工程—机械制造及自动化] TK73[交通运输工程—轮机工程]