【作者】 徐辉；

【导师】 索丽生；

【作者基本信息】 河海大学 ， 水利水电工程， 2005， 博士

【摘要】 本文针对城市排水泵站前池扩散角大、有压管涵进水的特点,系统深入地对正向进水、机组与结构对称布置的大中型城市排水泵站进水水力特性进行了全面系统的研究,主要研究内容如下: 1、泵站进水系统水力特性与水泵运行条件密切相关,在阐述国内外在泵站进水水力特性方面研究进展的基础上,指出城市排水泵站有别于其它用途泵站,在整流的同时需要兼顾防淤、减淤,提出了导流板整流技术措施; 2、针对前池流场是具有强紊动的自由表面流动的特点,应用VOF方法,采用Realizable κ-ε的紊流数学模型,对两个工况前池流场的数值模拟结果与对应的物理试验结果的比较验证,说明本文采用的数学模型是合适的; 3、应用水动力学、物理试验和数值模拟,分析了城市排水泵站前池流场的特点:顶冲回流、主流居中,并分析了前池不良流态对水泵运行的影响与危害; 4、通过CFD模拟和定性分析,来拟定导流板整流技术物理试验方案。在物理试验基础上,详细分析导流板设置位置、倾斜角度与板下缘悬空高度对整流效果的影响,给出了能够合理优化的整流技术导流板布置方案。更多还原

【Abstract】 In the thesis, a general study on inlet hydraulic characteristics(IHC) of representative urban drainage pumping station which layout is symmetrical was made.The main contents are listed as follow :1. The IHCs relate closely to the operating of pump.Based on the summary about the approach on IHC of pumping stations,a viewpoint that it is necessary to regulate the flow pattern in the fore-bay and the flow-regulating measures must be helpful to reduce the sedimenting was put forward.It is proposed that the diversion plate is suited to regulate the flow.2. The CFD (Computational Fluid Dynamics) numerical simulation based on VOF method and Realizable k-e turbulence model was used to simulate the high-turbulent free surface flow.The comparing between the simulation result and the experiment data for two cases indicates that the CFD numerical simulation is applicable.3. With hydrodynamics, experiment and numerical simulation, the characteristics of the flow pattern in the fore-bay ,ie.backflow due to bump the back-wall and the main flow along the middle passage,are analyzed.Meanwhile,the disadvantage on the operating of pump due to bad flow pattern was also analyzed.4. Based on numerical simulation and qualitative analysis,the scheme for experiment about the flow-regulating technology with the diversion plate was determined.The effects on flow-regulating in different position, different inclining angle and the clearance between the under edge of diversion plate and the bottom of fore-bay were analyzed.The optimal scheme was suggested.更多还原