摘要
受侧向进水的弯道水流特征的影响,侧向引河段内会产生大尺度回流.对侧向引河段的回流流动,以及为消除这种回流而采用的＂底坎＋Y形导流墩＂的组合整流措施后的流动,分别进行了数值模拟,并获得了侧向引河段的三维全流场.结果表明,这种复式导流措施有效地消除了侧向引河段内的回流,改善了引河段出口（进水流道或进水池进口）的流速分布.在进水流道进口前10cm断面处,流速分布均匀度达到84.43%;当底坎坎高取正常水深的0.30~0.45倍时,能获得较好的整流效果;Y形导流墩使流动对称性显著改善,涡流回旋强度减小,为后续的整流提供了有效的先期结果.经与试验结果对比,CFD数值模拟的计算结果与模型试验的结果是一致的,说明计算结果可信.
Large-scale circulation flow can be caused in the side-intake forebay with the effect of curved- flow character of side-intake. The three dimensional turbulent flow simulations were made for the circulation flow in a side-intake forebay and the flow after adopting the combined flow-adjusting fittings. The overall three dimensional flow field of the forebay was obtained. The results indicate that the combined flow-adjusting fittings eliminate the circulation flow in the side-intake forebay and improve the flow distri- bution at the forebay outlet. The uniformity of velocity distribution at the section 10 cm before inlet of suction passage is 84.43%. The better results of flow-adjusting can be achieved when the height of bottom sill is 0.3 - 0.45 time of the normal water depth. Flow symmetry is improved remarkably and the in- tensity of the circulation is decreased by ＂Y＂ type diversion pier, which provides the prior improving for the follow-up flow-adjusting effectively. Compared with the experimental results, CFD simulation results are consistent with the model test results, which indicate that the computation results are credible.
出处
《排灌机械》
EI
2009年第5期281-286,共6页
Drainage and Irrigation Machinery
基金
国家自然科学基金资助项目(50779060)
"十一五"国家科技支撑计划项目(2006BAD11B07-5)
江苏省高校重点项目(k9870)
关键词
泵站
引河段
回流
整流
数值模拟
pumping station
intake
circulation
flow adjusting
numerical simulation
