为了优化闸站结合泵站运行时的前池流态,消除不良流态的影响,采用物理模型试验和数值模拟相结合的方法,分析了不良流态发生的原因。提出了多种优化整流方案,研究了其整流效果,构建了由带通水孔的导流墙、Y型导流墩和沿流向导流坎所形成的组合式整流措施。数值模拟发现,带通水孔的导流墙能够有效缩小并上移导流墙后回流区,再借助Y型导流墩和沿流向导流坎的整流作用,能使前池水流均匀顺直地进入进水池,较好地解决了因横向流速产生的偏流问题。研究结果表明,该组合式整流措施使得进水流道进口流速均匀度由86.30%提高到了93.46%,进水池两侧轴向流速偏差度由原来的12.63%下降为3.47%,整流效果显著。研究成果可为类似泵站工程流态改善提供参考。
Abstract
The aim of this study is to optimize the flow pattern in the forebay of sluice-pump station and eliminate the influence of unfavorable flow pattern. Causes of unfavorable flow pattern were analyzed via physical model test and numerical simulation. The effects of several optimized flow-rectifying schemes were examined, and a combinatorial rectification measure composed of diversion wall with drainage holes, Y-shaped diversion pier and diversion bucket along the flow direction was proposed. Numerical simulation verified that the diversion wall with drainage holes effectively reduced and moved upwards the backflow zone behind the diversion wall; the Y-shaped diversion pier and the diversion bucket along the flow direction helped the water flow in the forebay enter the pool uniformly and directly, hence solving the problem of flow deviation caused by transverse velocity. The proposed optimization scheme enhanced the uniformity of inlet velocity from 86.30% to 93.46%, and reduced the deviation of axial velocity from 12.63% to 3.47%. The research results implied sound effect of flow rectification.
关键词
泵站 /
前池 /
整流 /
数值模拟 /
流态优化
Key words
pumping station /
forebay /
rectification /
numerical simulation /
optimization of flow pattern
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 陆银军,周 伟,明月敏, 等.基于数值模拟的闸站结合布置优化设计[J].排灌机械工程学报,2014,32(11):963-967.
[2] LUO C, QIAN J, LIU C, et al. Numerical Simulation and Test Verification on Diversion Pier Rectifying Flow in Forebay of Pumping Station for Asymmetric Combined Sluice-Pump Station Project[J]. Journal of Agricultural Engineering, 2015, 31(7):100-108.
[3] FAN J L, LU D, SHI Z X, et al. Lateral Water Pumping Station Forebay of Jingtai Electric Power Irrigation District Flow State Numerical Simulation and Preventing Silt Research[J]. International Journal of Computational and Engineering, 2016, 1(2): 30-32.
[4] 张亚莉,宋世露,陈 勇, 等.泵站侧向进水前池整流措施数值模拟[J].中国农村水利水电,2016(5):117-120.
[5] TEAIMA I R, EL-GAMAL T. Improving Flow Performance Of Irrigation Pump Station Intake[J]. Journal of Applied Water Engineering and Research, 2017(5): 9-21.
[6] ZHAO Z L, QIAN Z D, Guo Z W,et al. Experimental Study Of Subsurface Vortices In Pump Intake with an Improved Diversion-Cone[J]. IOP Conference Series: Earth and Environmental Science, 2019, 240(3): 1-7.
[7] 徐 波,高 琛,夏 辉,等.开孔导流墩几何参数对闸站工程前池整流效果的影响[J].长江科学院院报,2019,36(2):58-62.
[8] 成 立,祁卫军,罗 灿, 等.Y形导流墩几何参数对泵站前池整流效果的影响[J].水利水电科技进展,2014,34(1):68-72.
[9] SONG W W, PANG Y, SHI X H,et al. Study on the Rectification of Forebay in Pumping Station[J]. Mathematical Problems in Engineering,2018, doi: 10.1155/2018/2876980.
[10] 夏臣智,成 立,焦伟轩, 等.泵站前池倒T形底坎整流措施数值模拟[J].南水北调与水利科技,2018,16(2):146-150,163.
[11] 罗 灿,成 立,刘 超.泵站正向进水前池底坎整流机理数值模拟[J].排灌机械工程学报,2014,32(5):393-398.
[12] 夏臣智,成 立,赵国锋, 等.泵站前池单排方柱整流措施数值模拟[J].水利水电科技进展,2017,37(4):53-58.
[13] XU C D, WANG RR, LIU H, et al. Flow Pattern and Anti-silt Measures of Straight-edge Forebay in Large Pump Stations[J]. International Journal of Heat and Technology,2018, 36(3):1130-1139.
[14] 资 丹,王福军,姚志峰, 等.大型泵站进水流场组合式导流墩整流效果分析[J].农业工程学报,2015,31(16):71-77.
[15] GAO C C, ZENG X L, XIE K Y, et al. Combined Rectification Scheme of Pump Intake Sump in Ultra-low Water Level and Its Verification[J]. Journal of Agricultural Engineering, 2017, 33(23): 101-108.
[16] XU C D, ZHANG H Y, ZHANG X Q, et al. Numerical Simulation of the Impact of Unit Commitment Optimization and Divergence Angle on the Flow Pattern of Forebay[J]. International Journal of Heat and Technology, 2015, 33(2): 91-96.
[17] 朱翠民,皇甫泽华,皇甫明厦,等.基于水工模型试验的前坪水库溢洪道优化设计研究[J].水力发电学报,2019,38(1):111-120.
基金
国家自然科学基金项目(51541912);“十二五”国家科技支撑计划项目(2102BOD08B03-2)
PDF(4820 KB)
