泵站出水池-无压隧洞过渡段体型优化研究

泵站出水池到无压隧洞过渡段体型对隧洞的过流能力、沿程水面线及局部水头损失影响显著。针对某泵站工程过渡段的水流特性问题,采用比尺为1∶25物理模型对该过渡段进行了优化研究,延长了过渡段长度,增加了边墙扭曲段。研究发现:模型改进后,过流能力增加,水流平稳;局部水头系数从原设计的0.057~0.111减小至0.051~0.111;中心线水面线的纵向变化幅度减小。通过各项指标表明,优化后的过渡段比原设计方案显现出更为优良的特性,提出的优化设计方法可为其他类似工程提供借鉴经验。

Optimization of transition section shape from outlet sump of pumping station to free-flow tunnel

The influence of transition section shape from outlet sump of pumping station to free-flow tunnel on current capacity, surface line and local head loss is significant. Aiming at solving the problem that the flow characteristic of a pump station is complex, the transition section was lengthened and warped surface wall was optimized by a test model with a geometric scale of 1/25 in accord with. The results show more smooth streamlines and an increase in flow capacity in the modified transition, along with a reduction from 0.051~0.074 to 0.051~0.074 in local head loss and a reduction in ranges of central longitudinal water surface profiles. The hydraulic characteristics indicators show that the transition section after optimization performs a better characteristics compared with that of the original design scheme. The optimal design of the project can provide a reference for other similar projects.