| 摘要: |
| 泵站布置形式因进水方式不同通常分为正向和侧向两种进水方式，侧向进水时前池来流方向和前池中的主流方向存在夹角，此时由于弯道水流的运动特性，侧向进水前池容易产生主流脱壁、回流和漩涡等不良流态，难以形成良好的水泵进水条件，影响机组的安全运行。针对古德洛尔电厂一期侧向进水泵站前池，采用RNG κ-ε双方程紊流模型封闭雷诺平均的N-S方程，利用SIMPLEC算法对泵站前池及部分引水明渠水流流场进行三维数值模拟，对比分析设计方案修改前后前池水流的流速、涡量、水面线等水力参量分布特性，并以典型断面流速分布均匀度为目标函数分析整流措施前后前池内流速分布均匀度变化，验证了增加合理的整流措施可以有效改善前池流态。 |
| 关键词: 进水池 流场 紊流 三维数值模拟 整流措施 流速分布 泵站 |
| DOI： |
| 分类号:TV675 |
| 基金项目:国家自然科学基金资助项目（51379128） |
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| 3-D numerical simulation for side inlet forebay of a pumping station |
|
WANG Fang-fang1,2
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1.Nanjing Hydraulic Research Institute;2.Hohai University
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| Abstract: |
| In view of different patterns of intake, pumping station arrangement is usually divided into two types of the forward and lateral intakes. When the water passes over the side-inlet forebay of the pumping station, there is an angle between the main flow direction in the side-inlet forebay and its inflowing direction. At this time some undesirable flow patterns such as the main flow direction moving off the wall, reverse current and vortex are caused by the motion characteristics of the flow along the curved section, thus it is difficult to form a good inlet condition for the pump and affect the safe operation of the pumping units. A 3-D mathematical model to simulate the water flow in both the side-inlet forebay and the inflowing channel of the first phase of Cuddalore pumping station is developed in this paper. The RNG κ-ε turblent model is used to close the Navier-Stockes equations and the SIMPLEC algorithm method is adopted to calculate the flow field, which are finished by the Fluent 6.3.26 software. Here, two schemes(the original and the rectifying schemes) on the Cuddalore pumping station are calculated. The distribution characteristics of the hydraulic parameters including velocity, vorticity and water surface line about the two schemes have been compared, the uniformity of flow distribution in the side-inlet forebay based on the target function of the velocity distribution along the typical cross-sections is also analyzed. Finally it is more exactly understand the characteristics of water flow in the side-inlet forebay, and the analysis results show that the reasonable rectifying measures can effectively improve the flow pattern in the forebay. |
| Key words: side-inlet forebay flow field turbulent 3-D mathematical model rectifying measures velocity distribution pumping station |
