【摘要】：流體流動到有高差的地方,或在流動中有壓力降低的地方,有可利用的能量。由于離心水泵可反轉(zhuǎn)用作水輪機,而且在雙向運行條件下,最高效率基本相同。由于水泵具有上述優(yōu)點,并且水泵經(jīng)濟性能良好,那么在有可利用能量的場合,是不是可以用水泵反轉(zhuǎn)去回收在利用這些能量是一個值得研究的課題。因此本文旨在探索離心水泵反轉(zhuǎn)的特性,尋找多級泵做透平運行的一般規(guī)律,研究改善多級泵透平運行的一般方法。 本文根據(jù)實際化工過程系統(tǒng)提供的流量,轉(zhuǎn)速,壓差,汽蝕余量等參數(shù),介紹了本泵所采用的設(shè)計方法和用到的經(jīng)驗公式。在具體水力設(shè)計中采用自主開發(fā)的水泵CAD軟件進行模型輔助設(shè)計,在通過數(shù)值模擬對模型進行優(yōu)化修正,最終確定具有較高效率的多級泵模型,并使用三維造型軟件對其各部件進行三維造型。 運用star-cd對該泵逆工況即水輪機工況的各個部件及整體的內(nèi)部流場分別進行數(shù)值模擬。研究不同工況下,多級泵內(nèi)部流場壓力、速度分布規(guī)律,找出多級泵反轉(zhuǎn)時影響其效率的主要因素,尋找其一般規(guī)律,并提出修改意見。 工作機工況時,對多級泵各個部件及整體的內(nèi)部流場進行數(shù)值模擬。繪制該泵的揚程和效率曲線。分析在相同的工況下,多級泵做原動機和工作機時其流場變化,損失大小。探索多級泵透平運行時的一般流動規(guī)律。
[Abstract]:The fluid flows to places where there is a high difference, or where the pressure decreases in the flow, and there is energy available. Because the centrifugal pump can be reversed as a turbine, and under the condition of two-way operation, the maximum efficiency is basically the same. Because the pump has the above advantages and the economic performance of the pump is good, whether the pump can be reversed to recover the energy in the case of available energy is a topic worthy of study. Therefore, the purpose of this paper is to explore the characteristics of centrifugal pump inversion, to find out the general law of multistage pump turbine operation, and to study the general methods to improve the multistage pump turbine operation. According to the parameters such as flow rate, rotating speed, pressure difference and cavitation margin provided by the actual chemical process system, the design method and empirical formula of the pump are introduced in this paper. In the specific hydraulic design, the self-developed pump CAD software is used for model aided design, and the model is optimized and modified by numerical simulation, and the multi-stage pump model with high efficiency is finally determined. And use the three-dimensional modeling software to carry on the three-dimensional modeling to its each component. Star-cd is used to simulate the internal flow field of each part and the whole of the pump under the reverse working condition, that is, the turbine working condition. The distribution of flow field pressure and velocity in multistage pump under different working conditions is studied, the main factors affecting the efficiency of multistage pump are found out, the general law is found, and the suggestions for modification are put forward. When the working machine is working, the internal flow field of each component and the whole of the multi-stage pump is simulated. Draw the lift and efficiency curve of the pump. Under the same working condition, the flow field change and loss of multi-stage pump as prime mover and working machine are analyzed. The general flow law of multistage pump turbine is explored.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH311

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