【作者】 成立；

【导师】 刘超；

【作者基本信息】 河海大学 ， 水利水电工程， 2006， 博士

【摘要】 泵站作为耗能大户,提高其运行水力性能具有重要现实意义。本文研究以南水北调东线工程泵站建设和大型泵站更新改造为背景,运用三维紊流模拟技术辅依实验等研究手段,基于大型计算流体力学软件Fluent为平台,对涉及影响泵站水力性能的过流结构进行全面系统的研究,揭示泵站内部流动特性、预测水力性能,提出设计目标。 基于紊流数值模拟,全面系统地研究了泵站进水池、进水流道、出水流道及整体泵装置内部流动规律和水力性能。通过与已有实验成果比较表明计算结果是可信的,今后采用本文研究方法与实验研究相结合,可充实补充实验数据,甚至减少实验工作量。 提出了从外特性和内特性两方面进行泵站进水池优化的目标函数。采用重整化群紊流模型对泵站进水池进行数值模拟研究,获得了三维基本流态,分析了泵站进水池设计参数对水力性能及流态的影响,在分析吸水管内断面流速分布基础上,推荐了水泵名义高度的取值。 建立在对立式泵装置喇叭管进水流道流场进行数值分析的基础上,提出了喇叭管进水流道演化理论。数值分析了肘形进水流道三维流动,提出叶轮名义高度控制参数。 依据泵站出水流道的水力设计基本要求,建立了出水流道水力性能优化目标数学模型。依据优化目标,进行双向泵站出水室优选和出水流道内部流动特性分析,结合泵站改造,提出了双向泵装置的出水流道设计控制参数。 采用多参考系模型,通过对三种不同形式的整体泵装置的计算,获得了内部三维流动特性,预测了水力性能,分析了特征工况与内流场的联系。泵装置计算结果与实验结果吻合较好,表明本文的三维流场计算和性能预测达到了工程应用研究的精度。在分析已有水力损失方法的基础上,提出了新的低扬程轴流泵装置水力损失计算方法。更多还原

【Abstract】 It is important to improve the running performance of pump stations, which is consuming large energy. Based on the background for construction of the East Route Project of the South-to-North Water Transfers, this paper systemically studied on passage which influents the hydraulic performance, adopting three-turbulence numerical simulation technique and experimentation. The research work indicates the characteristic of flow, property predication for pumping system and design principle.An optimize function is put forward based on outer and inner characteristics. The RNG k-ε turbulent model is applied to simulate the turbulent flow of typical opening pump sump Thecomputation flow field of the sump was obtained. The design parameters of pump sump areanalyzed to how to influent the hydrulic performance and flow pattern. The recommendedmeasurements of nominal height for the pump sump are presented.Based on the basic rule of suction box, a mathematics method of optimize performance is brought forward. Numerical computation of the turbulence flow is applied to analyze the flow field of different kinds of suction box. Evolvement theory for suction box of pumping system is the suction boxes are derived from the opening pump sump. The different kinds of suction box can be united if they have same controlled essence parameters. The named height of elbow tube of pumping system is put forward.Based on the basic rule of outlet passage, a mathematics method of optimize performance is brought forward. By use of the turbulent model simulation, numerical solutions of the outlet diffusion and passage flows for the two-ways pumping system are obtained. The control parameters of outlet passage are suggested and the numerical loss of head was given. The result will be used to reconstruction of pumping system.According to analyzing some models of hydraulic loss, a loss computed method for axial-pump system is put forward base on new loss model. Based on viscous numeration of whole pumping system, a predication model of hydraulic performance has been set up. Then, an idea of hydraulic design is brought forward, which is based on part and whole perfection. Using multiple reference frames, three types of pumping system were computed. The three flows characteristic was achieved and hydraulic performances were predicated. A good agreement was achieved between prediction data with experience data. The precision of computation and prediction adapts engineering applied research.更多还原