西淝河泵站流道优化及泵装置水力特性研究

发布时间：2018-02-08 11:51

本文关键词： 西淝河泵站流道优化数值模拟水力特性模型试验　出处：《扬州大学》2016年硕士论文　论文类型：学位论文

【摘要】：西淝河泵站属于安徽省淮河流域西淝河治理工程。泵站排涝、引水两用,设计装机6台套,水泵为2900ZLQ-100(转轮直径2.9m)型立式全调节轴流泵,配套TL2400-44/3250立式同步电动机,单机功率2400kW。泵站排涝净扬程范围0-5.55m,排涝设计流量180m3/s；引水净扬程范围为0-5.0m,引水流量150m3/s。泵站采用X型双向进、出水流道。初选南水北调天津同台测试TJ04-ZL-06水力模型。根据要求,针对西淝河泵站初步选择的水力模型和控制性尺寸,通过CFD数值模拟计算,完成进、出水流道优化设计；通过水泵装置模型试验,验证水泵在泵站运行范围内能否安全、稳定和高效运行。本文采用了三维紊流数值计算方法对西淝河泵站内进、出水流道的流动进行数值模拟,即将连续性方程、紊动能七方程、紊动能耗散ε方程和雷诺应力平均Navier-Stokes方程等方程组成控制方程组对流道内部流动进行模拟。选用块结构化网格控制流道计算区域的离散,选用控制体积法控制方程组的离散,还选用SIMPLEC算法求解离散后的控制方程组,交错网格系统布置变量。以泵站进、出水流道三维正命题求解为基础,对西淝河泵站进水流道和出水流道分别进行优化水力设计,同时也对流场进行了分析。优化后的进水流道能够实现水流转向有序、收缩均匀,出水流道能够实现转向有序、扩散平缓,进、出水流道均满足水力设计要求。针对选定的TJ04-ZL-06水力模型,开展泵装置模型试验。在无汽蚀条件下,在水泵模型上共测试了6个叶片角度：-6°、-4°、-2°、0°、+2°、+4°,得出对应的水泵动力特性,并根据动力特性试验结果绘制出模型和原型泵装置综合特性曲线。对水泵在不同叶片角度运行下的汽蚀余量进行测定,分别得到不同角度运行的汽蚀性能结果和各叶片角度临界汽蚀余量的变化曲线。开启辅助泵,形成泵装置稳定反向水头,水泵倒转,实测不同叶片角度对应水头的飞逸转速,绘出水泵装置的飞逸特性曲线。上述实验结果表明：西淝河泵站泵装置能较好地满足流量要求,装置效率指标能达到较高的水平,在全部运行范围内没有汽蚀危害,飞逸特性满足规范要求。本文开展的进、出水流道优化设计CFD数值计算和泵装置模型试验的研究不仅能为西淝河泵站工程建设提出重要的指导意见。同时,也能够为今后我国大型泵站工程的建设提供良好的参考依据。
[Abstract]:The Xifeihe River pumping Station belongs to the Xifeihe River treatment Project in the Huaihe River Basin of Anhui Province. The pumping station is designed for waterlogging and water diversion. The pump is designed for 6 sets. The pump is 2900ZLQ-100 vertical fully regulated axial flow pump with TL2400-44/3250 vertical synchronous motor. Single machine power 2400kW. pump station drainage net lift range 0-5.55m. drainage design discharge 180m3s; diversion net lift range 0-5.0m, diversion flow 150m3s. Pump station adopts X-type two-way inlet, outlet passage. Primary South-to-North Water transfer Tianjin test hydraulic model. According to requirements, According to the hydraulic model and control dimension of Xifeihe pump station, the optimal design of inlet and outlet runner is completed by CFD numerical simulation, and the model test of pump device is carried out to verify whether the pump is safe in the operation range of pump station. Stable and efficient operation. In this paper, the numerical simulation of the flow in and out channel of Xifeihe pumping station is carried out by using the three-dimensional turbulent numerical method, that is, the continuity equation, the seven equations of turbulent energy, The turbulent energy dissipation 蔚 equation and Reynolds stress average Navier-Stokes equation are used to simulate the internal flow of the flow channel. The block structured grid is used to control the discretization of the channel calculation area, and the control volume method is used to control the discretization of the equations. SIMPLEC algorithm is also used to solve discrete control equations and staggered grid system layout variables. Based on the solution of three dimensional positive proposition of inlet and outlet passage of pump station, the hydraulic design of inlet channel and outlet channel of Xifeihe pumping station are optimized, respectively. At the same time, the flow field is analyzed. The optimized influent passage can realize the flow turn orderly, the contraction is uniform, the outlet passage can realize the turn order, the diffusion is smooth, and the flow is advancing. For the selected TJ04-ZL-06 hydraulic model, the pump device model test was carried out. Under the condition of no cavitation, a total of 6 blade angles of 0 掳, 2 掳and 4 掳were tested on the pump model, and the corresponding dynamic characteristics of the pump were obtained. The model and the integrated characteristic curve of the prototype pump device are drawn according to the test results of dynamic characteristics. The cavitation margin of the pump running at different blade angles is measured. The results of cavitation performance at different angles and the variation curves of critical cavitation allowance of each blade angle are obtained respectively. When the auxiliary pump is opened, the pump head is stabilized, the pump is reversed, and the flying speed of the head is measured at different blade angles. The experimental results show that the pump unit of Xifeihe pumping station can meet the requirement of flow, the efficiency of the pump can reach a higher level, and there is no cavitation harm in the whole operation range. The CFD numerical calculation of optimal design of inlet and outlet passage and the model test of pump unit can not only provide important guidance for the construction of Xifeihe pumping station, but also provide important guidance for the construction of the pump station. It can also provide a good reference for the construction of large pumping station in China.
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TV675

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