| 轴流泵模型多叶片安放角的数值计算 |
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| 引用本文： | 陈红勋,朱兵,李随波.轴流泵模型多叶片安放角的数值计算[J].排灌机械,2010,28(5):378-383. |
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| 作者姓名： | 陈红勋 朱兵 李随波 |
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| 作者单位： | 上海大学,上海市应用数学与力学研究所,上海,200072 |
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| 基金项目： | 上海市重点学科建设项目，上海市科技人才计划项目 |
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| 摘 要： | 在同一轴流泵模型0°安放角数值计算结果的基础上,应用ANSYS CFX软件,选择标准k-ε湍流模型和可伸缩壁面函数,在不同的叶片安放角下,采用全六面体网格和经网格无关性分析的网格数,分别在定常和非定常条件下进行了多工况的数值模拟和外特性计算,并将计算结果与试验结果进行对比.在规范使用工具软件的条件下,分析了CFD数值模拟技术预估轴流泵性能的精度及其误差的特点.结果表明,非定常计算扬程值略高于试验值,而定常计算扬程值低于试验值,非定常计算的总体精度高于定常计算,且误差可控制在5%以内;定常和非定常预测的效率误差可控制在7%以内,且非定常计算的效率与试验效率存在一相对固定幅度的偏差,据此可用于修正同类模型效率的预测值.基于非定常计算的结果,进一步分析了叶轮和导叶圆柱面上流线分布、叶片截线压力分布和轴流泵过流部件各部分水力损失随叶轮叶片安放角和流量的变化规律,发现在小流量工况,靠近轮毂位置存在旋涡堵塞现象;在计算工况范围内,导叶段和出水段水力损失随流量的增大呈现先减小后增大的趋势.
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| 关 键 词： | 轴流泵模型 多安放角 性能曲线 数值计算 可信度分析 |
Numerical calculation of axial-flow pump model with multi-blade stagger angles |
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| Chen Hongxun,Zhu Bing,Li Suibo.Numerical calculation of axial-flow pump model with multi-blade stagger angles[J].Drainage and Irrigation Machinery,2010,28(5):378-383. |
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| Authors: | Chen Hongxun Zhu Bing Li Suibo |
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| Institution: | (Shanghai Institute of Applied Mathematics and Mechanics,Shanghai University,Shanghai 200072,China) |
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| Abstract: | Based on the earlier numerical calculation about an axial-flow pump model at 0° installation angle,the same axial flow pump model was chosen and simulated at other various angles,and the performance was analyzed under steady and unsteady operating conditions.In the ANSYS CFX software,the standard k-ε turbulence model and scalable wall function were used with suitable mesh number and distribution.The difference between numerical simulation and experiment was compared and analyzed.Under the standard use of CFD tools,the accuracy and error characteristic of numerical simulation were analyzed in order to guide CFD technique to engineering application.When comparing with the experiment value,it is concluded that the predicted water head value by unsteady simulation is slightly higher,while that by steady simulation is lower.Generally speaking,the unsteady simulation accuracy is superior to the steady one,and the water head error can be controlled within 5%.The efficiency error for both methods can be controlled within 7%,and there is a relative fixed amplitude deviation for unsteady simulation,which can be used to guide the error correction of efficiency prediction.According to the unsteady calculation results,the streamline distribution of impeller and guider span surfaces,the blade span section line pressure distribution,and the variation of hydraulic loss with blade stagger angles and flow rate for different parts are analyzed.Under small flow rate condition,there exits a vortex jam phenomenon near the hub.Within the range of simulation operation conditions,the hydraulic losses for both guider part and outlet part will firstly decrease and then increase with the flow rate increasing. |
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| Keywords: | axial-flow pump model multiple stagger angles performance curve numerical calculation reliability analysis |
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