本文選題：大型低揚(yáng)程泵站　切入點(diǎn)：泵裝置能量性能　出處：《揚(yáng)州大學(xué)》2017年碩士論文

【摘要】：大型低揚(yáng)程泵站在水資源調(diào)配、農(nóng)業(yè)灌排、水環(huán)境改善和城市抗洪排澇等方面起著重要作用。我國(guó)大型低揚(yáng)程泵站數(shù)量多,能耗總量大,為適應(yīng)節(jié)能減排的發(fā)展趨勢(shì),對(duì)泵站能量性能的要求越來(lái)越高,特別是對(duì)于運(yùn)行時(shí)間長(zhǎng)的大型低揚(yáng)程泵站,泵裝置的能量性能指標(biāo)近一些年來(lái)受到越來(lái)越多的重視。長(zhǎng)期以來(lái)泵裝置能量性能的指標(biāo)主要通過(guò)理論分析或模型試驗(yàn)的方法獲得。采用單純理論分析的方法計(jì)算泵裝置能量性能,在其推導(dǎo)過(guò)程中往往需借助于一些近似或假設(shè),與實(shí)際情況相差較大;采用泵裝置模型試驗(yàn)的方法可以獲得準(zhǔn)確的能量性能指標(biāo),但這種方法周期長(zhǎng)、費(fèi)用高,且不利于多個(gè)方案的比較。為了在大型低揚(yáng)程泵站設(shè)計(jì)的過(guò)程中適時(shí)和準(zhǔn)確地了解所設(shè)計(jì)泵裝置的性能指標(biāo),以便科學(xué)評(píng)價(jià)水泵及泵裝置的選型、進(jìn)出水流道水力設(shè)計(jì)是否滿足要求,因此有必要研究一種準(zhǔn)確度高和應(yīng)用方便的泵裝置能量性能計(jì)算方法。本文應(yīng)用數(shù)值模擬和模型試驗(yàn)相結(jié)合的方法,以數(shù)值模擬為主、以模型試驗(yàn)為輔,研究得到了大型低揚(yáng)程泵站泵裝置能量性能計(jì)算方法,并將其編制成易于掌握應(yīng)用的計(jì)算機(jī)軟件。本文具體研究?jī)?nèi)容包括以下幾個(gè)方面:(1)在研究相關(guān)資料的基礎(chǔ)上,分析了泵裝置揚(yáng)程、水泵水力性能及nD值、流道型式及進(jìn)出水流道水力性能對(duì)低揚(yáng)程泵裝置能量性能的影響;(2)在對(duì)立式軸流泵裝置、斜式軸流泵裝置和前置豎井貫流泵裝置等3種不同泵裝置型式的低揚(yáng)程泵裝置進(jìn)、出水流道優(yōu)化水力設(shè)計(jì)研究的基礎(chǔ)上,采用CFD數(shù)值模擬的方法得到進(jìn)、出水流道的流態(tài)并準(zhǔn)確計(jì)算進(jìn)、出水流道的水頭損失,再以透明流道試驗(yàn)檢驗(yàn)為輔的研究方法來(lái)檢驗(yàn)流道中水流的流態(tài);(3)對(duì)“水泵模型測(cè)試段”、“泵段”的概念以及兩者性能之間的差別進(jìn)行較為細(xì)致的分析;比較和分析泵裝置與泵段水力性能的差別;根據(jù)南水北調(diào)天津同臺(tái)測(cè)試的結(jié)果,對(duì)泵段效率進(jìn)行修正;(4)根據(jù)流道、泵段的計(jì)算結(jié)果,利用泵裝置與泵段、流道之間的能量平衡關(guān)系,研究低揚(yáng)程泵裝置效率計(jì)算方法;計(jì)算了立式軸流泵裝置、斜式軸流泵裝置和前置豎井貫流泵裝置等3種不同泵裝置型式低揚(yáng)程泵站的水泵泵段效率、水泵軸功率、水泵泵段揚(yáng)程、泵裝置效率等能量性能參數(shù);并將計(jì)算結(jié)果與泵裝置模型試驗(yàn)結(jié)果進(jìn)行比較,驗(yàn)證計(jì)算結(jié)果的準(zhǔn)確性;(5)以Visual Basic 6.0作為軟件編制平臺(tái),將大型低揚(yáng)程泵裝置能量性能計(jì)算方法編制成計(jì)算機(jī)軟件并進(jìn)行應(yīng)用。本文所研究得到的大型低揚(yáng)程泵站泵裝置能量性能計(jì)算方法可應(yīng)用于大型泵站工程,特別是在泵站工程設(shè)計(jì)的項(xiàng)目建議、可研和初設(shè)等不同階段,為泵裝置的選型、設(shè)計(jì)、招標(biāo)等提供科學(xué)依據(jù),對(duì)于提高泵站設(shè)計(jì)質(zhì)量和工程建設(shè)水平具有十分重要理論意義和實(shí)用價(jià)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.
【學(xué)位授予單位】：揚(yáng)州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TV675

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