城市供水泵站启停机对前池涌浪的影响
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摘要
在调压室理论基础上,分析了泵站前池涌浪的波动周期和规律,并据此得出了单泵和多泵运行工况下,水泵不同时间间隔启停机的涌浪叠加效果。研究表明,数值计算结果与理论分析的规律一致,前池最不利的涌浪叠加时刻为上游管道流量的最大(小)时刻,该时刻对应前池水位变化梯度最大的时刻。在单台水泵进行启停机操作时,泵站其他正常运行机组的台数越多,越有利于平抑因该台水泵启停机而产生的前池涌浪叠加幅值。
Based on the theory of surge-chamber,the cycle and law of fluctuation of the surge in the forebay of pumping station are analysed herein. On the basis of this,the superposed effects from various time intervals of the startup and shutdown of pumping station on the surge in the forebay under the single or multi-pump operation conditions are obtained. The study shows that the law got from the numerical calculation coincides with that from the theoretical analysis,i. e. the most unfavorable moment of the surge superposition in the forebay is just the moment when the flow rate inside of the upstream pipeline is the maximum( or the minimum),while this moment is corresponding to the moment of the maximum of the water level changing gradient. When only a single pump starts up and shuts down,the more the pumping units operate in the pumping station,the favorable for restraining the amplitude of the surge superposition in the forebay caused by that pump will be.
Based on the theory of surge-chamber,the cycle and law of fluctuation of the surge in the forebay of pumping station are analysed herein. On the basis of this,the superposed effects from various time intervals of the startup and shutdown of pumping station on the surge in the forebay under the single or multi-pump operation conditions are obtained. The study shows that the law got from the numerical calculation coincides with that from the theoretical analysis,i. e. the most unfavorable moment of the surge superposition in the forebay is just the moment when the flow rate inside of the upstream pipeline is the maximum( or the minimum),while this moment is corresponding to the moment of the maximum of the water level changing gradient. When only a single pump starts up and shuts down,the more the pumping units operate in the pumping station,the favorable for restraining the amplitude of the surge superposition in the forebay caused by that pump will be.
引文
[1]李静毅,李国平,王如华.五号沟泵站调试过程前池水位波动分析[J].给水排水,2011,37(6):17-21.
[2]徐辉.城市排水泵站进水水力特性研究[D].南京:河海大学,2008.
[3]冯建刚,李杰.大型城市水源泵站前池流态及改善措施试验[J].水利水电科技进展,2010,30(2):70-74.
[4]Wylie E B,Streeter V L,Suo Lisheng.Fluid Transient in Systems[M].New Jersey:Prentice Hall,1993.
[5]程永光,陈鉴治,杨建东.水电站调压室涌浪最不利叠加时刻的研究[J].水利学报,2004(7):109-113.
[6]李高会,张健,齐央央,等.阻抗上室式调压室突弃全负荷时涌浪的解析解[J].水电能源科学,2009,27(3):55-57.
[7]张永良,缪明非.组合工况下阻抗式调压室涌浪计算的显式公式[J].水利学报,2012,43(4):467-472.
[2]徐辉.城市排水泵站进水水力特性研究[D].南京:河海大学,2008.
[3]冯建刚,李杰.大型城市水源泵站前池流态及改善措施试验[J].水利水电科技进展,2010,30(2):70-74.
[4]Wylie E B,Streeter V L,Suo Lisheng.Fluid Transient in Systems[M].New Jersey:Prentice Hall,1993.
[5]程永光,陈鉴治,杨建东.水电站调压室涌浪最不利叠加时刻的研究[J].水利学报,2004(7):109-113.
[6]李高会,张健,齐央央,等.阻抗上室式调压室突弃全负荷时涌浪的解析解[J].水电能源科学,2009,27(3):55-57.
[7]张永良,缪明非.组合工况下阻抗式调压室涌浪计算的显式公式[J].水利学报,2012,43(4):467-472.