水库水温分层对浮式取水口前流速分布的影响

Effect from reservoir water temperature stratification on velocity distribution in front of floating water intake

由于目前缺乏对浮式取水口前流场变化规律的研究,以分析水库水温分层对取水口前各断面流速分布影响为目标,依据某水库水温资料,采用k-ε紊流模型对浮式取水口前流场进行三维数值模拟,针对水库水温均一和水温分层的两种情况,研究取水口前流速分布,分析水库水温分层对取水口前各断面流速分布的影响。研究结果表明,在浮式取水口附近,水温均一和水温分层的流速分布存在着差异,这种差距随着取水流量和淹没深度的增大而减小。研究成果可为浮式管型取水设施的应用和运行提供技术支持,为取水水温预测提供理论依据。

Due to lack of studies made on the changing law of the flow field in front of floating water intake at present, a 3 - D numerical simulation is made on the flow field therein with the k - ε turbulence model in accordance with the water temperature data of a reservoir by taking analyzing the effect from the reservoir water temperature stratification on the flow velocity distribu- tions in all the cross-sections in front of floating water intake, from which the flow velocity distribution in front of the water in- take is studied for both the conditions of the uniform water temperature and the water temperature stratification, and then the effect from the reservoir water temperature stratification on the flow velocity distributions in all the cross-sections in front of the floating water intake is analyzed. The study shows that the flow velocity distributions under the conditions of both the uniform water temperature and the water temperature stratification are different near the floating water intake and the difference is de- creased along with the increases of water intaking flowrate and submerged depth. The study result can not only provide a techni- cal support for the floating tubular water intake facility, but also can lay a theoretical basis for the prediction of the water tem- perature for water intake.