台阶式溢洪道滑掠流时均压强影响因素分析

杨吉健; 刘韩生; 张为法

doi:10.3969/j.issn.1001-5485.2015.08.010

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长江科学院院报 ›› 2015, Vol. 32 ›› Issue (8) : 57-60. DOI: 10.3969/j.issn.1001-5485.2015.08.010

水力学

台阶式溢洪道滑掠流时均压强影响因素分析

杨吉健¹,刘韩生¹,张为法²

作者信息 +

Factors Affecting Time-averaged Pressure ofSkimming Flow in Stepped Spillways

YANG Ji-jian¹,LIU Han-sheng¹,ZHANG Wei-fa²

Author information +

文章历史 +

摘要

由于台阶式溢洪道结构特殊,流态复杂,对台阶式溢洪道压强并未取得一致性的研究成果。对多个台阶式溢洪道滑掠流时均压强资料进行分析,探讨来流流量、掺气、台阶尺寸、溢洪道坡度等对台阶式溢洪道时均压强的影响。分析结果表明单宽流量大,时均压强变大;掺气可有效降低正压时均压力并增加负压值;台阶尺寸对台阶式溢洪道的影响较为复杂,台阶尺寸较小,且坡度较缓时竖直面压强呈中间小、两头大分布,坡度较大时具有2个压力极小值,位于竖直面底部和顶部,台阶尺寸较大时竖直面压强自下而上呈减小趋势;坡度增加,台阶式溢洪道压强变化幅度增大。

Abstract

As stepped spillway has special structure and complex flow patterns, researches on the pressure in stepped spillway are not consistent. In view of this, we investigate into the effects of flow discharge, air entrainment, step size and spillway’s slope gradient on the distribution of time-averaged pressure through analysing the pressure data of skimming flow in several stepped spillways. Results reveal that big discharge per unit width leads to big time-averaged pressure. Air entrainment could effectively reduce positive time-averaged pressure and increase negative pressure. Effect of the step size is complicated: when the step size is small with gentle slope, pressure is small in the middle but large on both ends in vertical plane of the step; when step size is small with steep slope, minimum pressure occurs on the bottom and top of step in vertical plane; while when the step size is large, pressure decreases from the bottom to the top, and pressure variation intensifies with the increase of slope gradient.

导出引用

杨吉健,刘韩生,张为法. 台阶式溢洪道滑掠流时均压强影响因素分析[J]. 长江科学院院报. 2015, 32(8): 57-60 https://doi.org/10.3969/j.issn.1001-5485.2015.08.010

YANG Ji-jian,LIU Han-sheng,ZHANG Wei-fa. Factors Affecting Time-averaged Pressure ofSkimming Flow in Stepped Spillways[J]. Journal of Changjiang River Scientific Research Institute. 2015, 32(8): 57-60 https://doi.org/10.3969/j.issn.1001-5485.2015.08.010

中图分类号： TV651.1

参考文献

[1] 吴宪生.台阶式溢流坝水力特性初探.四川水力发电,1998,17(1):73-77.(WU Xian-sheng. Elementary Study on Hydraulic Property of Stepped Spillway. Sichuan Water Power,1998, 17(1): 73-77. (in Chinese))
田嘉宁,魏炳乾,李布雳,等.台阶式溢流坝的时均压强特性 .水力发电学报, 2007,26(6):67-72. (TIAN Jia-ning, WEI Bing-qian, LI Bu-li, et al. The Characteristics of Mean Pressure on Stepped Overflow Dam. Journal of Hydroelectric Engineering, 2007, 26(6):67-72.(in Chinese))
李布雳,韩玙,田嘉宁.台阶式溢流坝上压强特性的试验研究.西安:西安理工大学,2005. (LI Bu-li, HAN Yu, TIAN Jia-ning. Experimental Research of Pressure Characteristic on Stepped overflow dam. Xi’an: Xi’an University of Technology, 2005.(in Chinese))
JUNY M S,POMARES J,DOLZ J. Pressure Field in Skimming Flow over a Stepped Spillway∥Proceeding of the International Workshop on Hydraulics of Stepped Spillways. Edited by MINOR H E,HAGER W H.Rotterdam: A.A.Balkema, March 22-24, 2000: 137-145.
张志昌,曾东洋,郑阿漫,等.台阶式溢洪道滑行水流压强特性的试验研究.水动力学研究与进展:A辑,2003,18(5):652-659. (ZHANG Zhi-chang, ZENG Dong-yang, ZHENG A-man, et al. Experimental Investigation on the Pressure Characteristics of Skimming Flow on Stepped Spillways. Chinese Journal of Hydrodynamics: Ser. A, 2003, 18(5): 652-659.(in Chinese))
曾东洋,张志昌,刘亚菲,等.台阶式溢洪道滑行水流时均压强特性研究.陕西水利发电, 2001,17(4):11-14. (ZENG Dong-yang, ZHANG Zhi-chang, LIU Ya-fei, et al. Study on the Characteristics of Time-average Pressure of Skimming Flow in Stepped Spillway. Journal of Shaanxi Water Power, 2001,17(4): 11-14. (in Chinese))
杨庆,戴光清. 阶梯溢流坝水力特性和消能机理试验研究 . 成都: 四川大学, 2002. (YANG Qing, DAI Guang-qing. Mode Test and Mechanism Research of the Stepped Overflow Spillway. Chengdu: Sichuan University, 2002. (in Chinese))
崔瑞. 坡度对台阶水流无掺气段压强特性的影响研究. 甘肃水利水电技术, 2013, 49(9): 22-27. (CUI Rui. Research on Impact of Slope in the Nonaerated Region of Stepped Spillways. Gansu Water Conservancy and Hydropower Technology, 2013, 49(9): 22-27.(in Chinese))
郑阿漫,张志昌,李建中. 掺气分流墩台阶式溢洪道水力特性的研究. 西安:西安理工大学, 2001. (ZHENG A-man, ZHANG Zhi-chang, LI Jian-zhong. Hydraulics of Stepped Spillways with Aerated Splitter. Xi’an: Xi’an University of Technology, 2001.(in Chinese))
陈群, 戴光清. 鱼背山水库岸边阶梯溢洪道流场的三维数值模拟. 水力发电学报, 2002,21(3):62-72. (CHEN Qun, DAI Guang-qing. Three-dimensional Numerical Simulation of the Stepped Spillway Overflow at the Yubeishan Reservoir. Journal of Hydroelectric Engineering, 2002, 21(3): 62-72. (in Chinese))
戴光清, 陈群, 刘浩吾. 阶梯溢流坝面过渡阶梯最佳起始位置. 四川水力发电, 2001, 20(B07): 31-34. (DAI Guang-qing, CHEN Qun, LIU Hao-wu. Best Starting Position of Transitional Steps in Stepped Spillways. Sichuan Water Power, 2001, 20(B07): 31-34. in Chinese))
董志勇, 吕阳泉, 居文杰, 等. 高速水流空化区和空蚀区掺气特性的试验研究. 水力发电学报, 2006, 25(4): 62-65. (DONG Zhi-yong, LV Yang-quan, JU Wen-jie, et al. Experimental Study of Aerated Characteristics in Cavitation Region of High Velocity Flow. Journal of Hydroelectric Engineering, 2006,25(4):62-65. (in Chinese))