| 引用本文: | 徐磊,李非凡,孙世宏, 等..前置竖井贯流泵出水流道设计参数对其水力性能的影响[J].灌溉排水学报,2021,(11):73-78. |
| XU Lei,,LI Feifan,SUN Shihong, et al..前置竖井贯流泵出水流道设计参数对其水力性能的影响[J].灌溉排水学报,2021,(11):73-78. |
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| 摘要: |
| 【目的】减小前置竖井式贯流泵装置出水流道水头损失、提高泵装置水力性能。【方法】采用经过模型试验验证的数值模拟方法，基于Navier-Stokes方程和标准k-ε湍流模型，研究了出水流道设计参数对其水力性能的影响。在分析出水流道组成和水力设计参数的基础上，拟定了3种不同出口宽度的出水流道，采用单因素变化方法对不同平面扩散角、立面扩散角、过渡段长度时的出水流道水头损失及出水流态分别进行了三维湍流流动数值模拟。【结果】随着出水流道平面扩散角的增加，流道水头损失先减小再增大，当平面扩散角为17°左右时，出水流道水头损失最小；当出水立面扩散角小于7°时出水流道水头损失基本不变，但大于7°时出水流道水头损失突然增大；随着出水流道扩散段长度增加，出水流道水头损失先减小再增大，在过渡段相对长度在0.6~0.8时达到最小；在出水流道水力设计参数常用范围内，各方案出水流道均无不良流态。【结论】采用合适的设计参数可使前置竖井贯流泵出水流道水头损失最小，提高泵装置效率。 |
| 关键词: 前置竖井贯流泵；出水流道；平面扩散角；立面扩散角；过渡段长度 |
| DOI：10.13522/j.cnki.ggps.2021183 |
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| 基金项目: |
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| Influence of Outlet Conduit Parameters on the Performance of Shaft Tubular Pump |
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XU Lei, LI Feifan, SUN Shihong, et al.
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1. School of Hydraulic Science and Engineering Yangzhou University , Yangzhou 225009, China;
2. The Eastern Route of South-to-North Water Diversion Project Jiangsu Water Source Co.,Ltd, Nanjing 210019, China
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| Abstract: |
| 【Objective】Hydraulic loss is a great concern in designing hydraulic apparatus and the objective of this paper is to investigate how to reduce it in the outlet conduit so as to improve the performance of shaft tubular pump.【Method】The analysis was based on the standard k-ε turbulent model, and water flow in the conduit was numerically simulated with the simulated results verified against experimental test. The validated model was then used to study the influence of outlet conduit parameters on the performance of the pump, from which we proposed three outlet conduits with different outlet widths. The simulated hydraulic loss and flow pattern in the conduits with different plane diffusion angles, elevation diffusion angles and transition section lengths were analyzed using the single factor method. 【Result】With the increase in the plane diffusion angle, the hydraulic loss in the outlet decreased first followed by an increase after the angle was larger than 17o. For elevation diffusion angle less than 7°, the hydraulic loss remained almost unchanged, while when it was larger than 7o, the hydraulic loss increased steadily. With the increase in the diffusion section length, the hydraulic loss decreased first followed by an increase when the relative length of the transition section was more than 0.6~0.8. When the hydraulic design parameters were within the normal range, we did not find bad flow patterns in the conduit.【Conclusion】When the design parameters are selected appropriately, the hydraulic loss of the outlet conduit of the front shaft tubular pump system can be minimized, and the pump system efficiency will be improved. |
| Key words: front shaft tubular pump; outlet conduit; plane diffusion angle; elevation diffusion angle; transition length |
