大型低扬程泵站泵装置能量性能计算方法研究及应用

发布时间：2018-03-23 23:25

本文选题：大型低扬程泵站　切入点：泵装置能量性能　出处：《扬州大学》2017年硕士论文

【摘要】：大型低扬程泵站在水资源调配、农业灌排、水环境改善和城市抗洪排涝等方面起着重要作用。我国大型低扬程泵站数量多,能耗总量大,为适应节能减排的发展趋势,对泵站能量性能的要求越来越高,特别是对于运行时间长的大型低扬程泵站,泵装置的能量性能指标近一些年来受到越来越多的重视。长期以来泵装置能量性能的指标主要通过理论分析或模型试验的方法获得。采用单纯理论分析的方法计算泵装置能量性能,在其推导过程中往往需借助于一些近似或假设,与实际情况相差较大;采用泵装置模型试验的方法可以获得准确的能量性能指标,但这种方法周期长、费用高,且不利于多个方案的比较。为了在大型低扬程泵站设计的过程中适时和准确地了解所设计泵装置的性能指标,以便科学评价水泵及泵装置的选型、进出水流道水力设计是否满足要求,因此有必要研究一种准确度高和应用方便的泵装置能量性能计算方法。本文应用数值模拟和模型试验相结合的方法,以数值模拟为主、以模型试验为辅,研究得到了大型低扬程泵站泵装置能量性能计算方法,并将其编制成易于掌握应用的计算机软件。本文具体研究内容包括以下几个方面:(1)在研究相关资料的基础上,分析了泵装置扬程、水泵水力性能及nD值、流道型式及进出水流道水力性能对低扬程泵装置能量性能的影响;(2)在对立式轴流泵装置、斜式轴流泵装置和前置竖井贯流泵装置等3种不同泵装置型式的低扬程泵装置进、出水流道优化水力设计研究的基础上,采用CFD数值模拟的方法得到进、出水流道的流态并准确计算进、出水流道的水头损失,再以透明流道试验检验为辅的研究方法来检验流道中水流的流态;(3)对“水泵模型测试段”、“泵段”的概念以及两者性能之间的差别进行较为细致的分析;比较和分析泵装置与泵段水力性能的差别;根据南水北调天津同台测试的结果,对泵段效率进行修正;(4)根据流道、泵段的计算结果,利用泵装置与泵段、流道之间的能量平衡关系,研究低扬程泵装置效率计算方法;计算了立式轴流泵装置、斜式轴流泵装置和前置竖井贯流泵装置等3种不同泵装置型式低扬程泵站的水泵泵段效率、水泵轴功率、水泵泵段扬程、泵装置效率等能量性能参数;并将计算结果与泵装置模型试验结果进行比较,验证计算结果的准确性;(5)以Visual Basic 6.0作为软件编制平台,将大型低扬程泵装置能量性能计算方法编制成计算机软件并进行应用。本文所研究得到的大型低扬程泵站泵装置能量性能计算方法可应用于大型泵站工程,特别是在泵站工程设计的项目建议、可研和初设等不同阶段,为泵装置的选型、设计、招标等提供科学依据,对于提高泵站设计质量和工程建设水平具有十分重要理论意义和实用价值。
[Abstract]:Large-scale low-lift pumping stations play an important role in water resources allocation, agricultural irrigation and drainage, water environment improvement and urban flood control and waterlogging. In order to adapt to the development trend of energy saving and emission reduction, large low-lift pumping stations in China have a large number of large low-lift pumping stations and a large amount of energy consumption. Higher and higher requirements for energy performance of pumping stations, especially for large low-lift pumping stations with long operating time, In recent years, more and more attention has been paid to the energy performance index of pump unit. For a long time, the energy performance index of pump unit has been obtained mainly by theoretical analysis or model test. Energy performance of pump device, In the process of derivation, some approximations or assumptions are needed, which is different from the actual situation. The accurate energy performance index can be obtained by using the method of pump device model test, but this method has a long period and high cost. In order to know the performance index of the designed pump device in time and accurately in the process of designing large low lift pump station, in order to scientifically evaluate the type selection of pump and pump device, Therefore, it is necessary to study a high accuracy and convenient method for calculating the energy performance of pump equipment. In this paper, the method of combining numerical simulation with model test is used, which is based on numerical simulation. Based on the model test, the energy performance calculation method of large low lift pump station is studied. The specific contents of this paper include the following aspects: 1. On the basis of the relevant data, the head of the pump device, the hydraulic performance of the pump and the nD value are analyzed. The influence of flow Channel Type and hydraulic performance of flow Channel on Energy performance of low head pump Unit in three different types of pump devices, such as opposite-type axial flow pump device, oblique axial flow pump device and front shaft tubular pump device, Based on the study of optimal hydraulic design of outlet channel, the flow pattern of outlet channel is obtained by CFD numerical simulation method, and the head loss of outlet passage is calculated accurately. Secondly, the research method of transparent channel test is used to test the flow state of flow in the channel. The concepts of "pump model test section", "pump section" and the difference between them are analyzed in detail. Comparing and analyzing the difference of hydraulic performance between pump device and pump section, according to the test results of the same station in Tianjin of South-to-North Water transfer Project, the efficiency of pump section is revised (4) according to the calculation results of flow channel and pump section, the pump device and pump section are used. The energy balance relationship between the flow channels, the calculation method of the efficiency of the low head pump device, the calculation of the vertical axial flow pump device, The energy performance parameters of the pump section efficiency, pump shaft power, pump head and pump device efficiency of three different pump devices, such as inclined axial flow pump device and front shaft through flow pump device, low head pump station; The calculation results are compared with the results of the pump device model test, and the accuracy of the calculation results is verified. (5) Visual Basic 6.0 is used as the software programming platform. The calculation method of energy performance of large low head pump device is compiled into computer software and applied. The energy performance calculation method of large low lift pump station can be applied to large pumping station project in this paper. In particular, in the different stages of project proposal, research and initial design of pump station design, the scientific basis is provided for the selection, design and bidding of pump installation, etc. It is of great theoretical significance and practical value for improving the design quality and engineering construction level of pumping station.
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV675

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