模袋混凝土渠道糙率影响因素数值模拟研究
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摘要
以模袋混凝土衬砌渠道为研究对象,使用FLUENT数值模拟软件对测流渠道建立二维模型,加载速度、压力和壁面粗糙度等边界条件,模拟渠道的流场,得出同一流量时不同水深的断面流速分布图。研究流量、流速与糙率的关系,以期在实际工作中为正确选择糙率系数提供依据。结果表明:对于模袋混凝土衬砌渠道,流速和流量是糙率的影响因素,通过数据相关性分析,糙率与流速、流量成负相关关系;沿渠底向水面的方向,流速逐渐增大,但是最大流速发生在水面以下,并且横向水流从渠道边壁向中央流动,导致较大流速集中在中间区域。
In this paper,the FLUENT numerical simulation software was used to establish two-dimensional model,loading velocity,pressure and wall roughness.The flow field of the channel was calculated by using FLUENT numerical simulation software to calculate the flow field of the same flow rate and section velocity profile.The relationship between flow rate,flow velocity and roughness was studied in order to provide the basis for choosing the roughness coefficient correctly in practice.The results show that for the concrete bag lining channel,flow velocity and discharge are the factors of roughness.Through data correlation analysis,roughness is negatively correlated with velocity and discharge;the velocity gradually increases along the direction of the channel's bottom,but the maximum velocity occurs below the water surface and the lateral flow from the channel wall to the central flow,resulting in a larger velocity concentrated in the middle area.
In this paper,the FLUENT numerical simulation software was used to establish two-dimensional model,loading velocity,pressure and wall roughness.The flow field of the channel was calculated by using FLUENT numerical simulation software to calculate the flow field of the same flow rate and section velocity profile.The relationship between flow rate,flow velocity and roughness was studied in order to provide the basis for choosing the roughness coefficient correctly in practice.The results show that for the concrete bag lining channel,flow velocity and discharge are the factors of roughness.Through data correlation analysis,roughness is negatively correlated with velocity and discharge;the velocity gradually increases along the direction of the channel's bottom,but the maximum velocity occurs below the water surface and the lateral flow from the channel wall to the central flow,resulting in a larger velocity concentrated in the middle area.
引文
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[14]吴持恭.水力学[M].北京:高等教育出版社,2007:143-150.
[15]雒天峰,吕宏兴.U形渠道断面流速分布规律的初步研究[J].灌溉排水学报,2006,25(2):12-14.
[2]徐卫东.群潜坝对河道糙率影响的数值模拟研究[D].太原:太原理工大学,2011:2-5.
[3]赵锦程.人工渠道糙率影响因素的试验研究[D].乌鲁木齐:新疆农业大学,2013:1-6.
[4]步丰湖,张红岐,王庆文,等.衬砌渠道糙率取值方法的研究[J].内蒙古水利,2007(4):144-146.
[5]何建京.明渠非均匀流糙率系数及水力特性研究[D].南京:河海大学,2003:94-95.
[6]杨岑.明渠均匀流糙率系数及紊动特性试验研究[D].杨凌:西北农林科技大学,2010:50-51.
[7]杨开林,汪易森.提高渠道糙率率定精度的方法[J].南水北调与水利科技,2011,9(6):1-15.
[8]郑小玉.溢洪道水力特性的数值模拟及试验研究[D].成都:四川大学,2004:11-12.
[9]张小峰,元媛,赵梓涵.糙率减小与洪峰增值关系的数值模拟研究[J].泥沙研究,2014(6):36-43.
[10]拜亚茹.明渠均匀流人工加糙壁面绝对粗糙度与糙率关系试验研究[D].乌鲁木齐:新疆农业大学,2015:1-5.
[11]高杨.U形渠道水力特性及测流试验研究[D].杨凌:西北农林科技大学,2011:2-10.
[12]严军,王二平,孙东坡,等.矩形断面明渠流速分布特性的试验研究[J].武汉大学学报(工学版),2005,38(5):57-62.
[13]张光碧,邓军,刘超,等.河道水流三维流速场的数值模拟研究[J].四川大学学报(工程科学版),2007,39(1):58-62.
[14]吴持恭.水力学[M].北京:高等教育出版社,2007:143-150.
[15]雒天峰,吕宏兴.U形渠道断面流速分布规律的初步研究[J].灌溉排水学报,2006,25(2):12-14.