抽水蓄能电站侧式进/出水口拦污栅断面的流速分布研究

本文以某抽水蓄能电站上水库进/出水口为例,通过水工模型试验,研究了侧式进/出水口拦污栅断面的流速分布规律,着重分析了扩散段隔墩布置型式与过渡段体型对拦污栅断面流速分布的影响。研究结果表明:上弯段后过渡段长度不足与圆变方段起始断面处采用变坡布置是导致拦污栅断面流速分布欠佳的主要原因,而三个分流隔墩的墩头位置在扩散段起始断面处齐平、对水流流态的影响也是导致拦污栅断面流速分布出现异常的原因之一。在上述研究成果的基础上,提出了改善拦污栅断面流速分布并有效消除负流速的工程措施。

Study on velocity distribution behind the trashrack in lateral intake/outlet of pumped storage power station

Hydraulic model test was carried out to study the velocity distribution behind the trashrack in lateral intake/outlet of a typical pumped storage power station. It is found that not only the trashrack but also the arrangement of the dividing piers as well as the configuration of transition section may significantly affect the velocity distribution.The incorrect arrangement of dividing piers and insufficient length of the transitional section are the major factors forming the disadvantageous velocity distribution in the intake/outlet.An improved scheme including the reasonable length of dividing pier and optimal slope of the floor in transition section is suggested.The effectiveness of the improved scheme is verified by experimental result.