山丘区自压输水管道水锤计算与模拟方法  

Calculation and simulation method for water hammerin gravity flow pipeline inhilly areas

作　　者：石晓悟 何武全[1,2] 李渤 段晓宁 田雨丰 SHI Xiaowu;HE Wuquan;LI Bo;DUAN Xiaoning;TIAN Yufeng(College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling,Shaanxi 712100,China;Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education,Yangling,Shaanxi 712100,China;PowerChina Northwest Engineering Corporation Limited,Xi′an,Shaanxi 710065,China)

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100 [2]旱区农业水土工程教育部重点实验室,陕西杨凌712100 [3]中国电建集团西北勘测设计研究院有限公司,陕西西安710065

出　　处：《排灌机械工程学报》2024年第3期282-287,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家重点研发计划项目(2022YFD1900402);国家科技支撑计划项目(2015BAD24B02)。

摘　　要：为了准确预测和防护山丘区自压输水管道的水锤破坏,提高管道输水的安全性和可靠性,针对山丘区自压输水管道落差大、距离长和地势起伏的特点,提出将输水管道划分为弯曲段和带倾斜角度的直管段,利用极限思想将弯曲管段基于切线的曲线拟合矢量化方法,拟合为沿管道中心线具有相同过流断面的多段等效短管;采用拟合等效短管和倾斜直管相结合的方法进行水锤计算,建立了自压输水管道的数值计算模型.以陕西省千阳县一自压管道输水工程为例进行了验证分析,通过模拟管道末端阀门不同关阀时间的水锤压力变化规律,得出最优关阀时间为50 s≤T≤120 s,提出了相应的水锤防护方案.结果表明该方法的计算和模拟精度高,可为山丘区长距离自压管道输水工程建设与管理提供参考.In order to accurately predict and protect the water hammer damage of gravity flow pipelines in hilly areas,and improve the safety and reliability of water transmission pipeline,in respective of the characteristics of large drop,long distance and topographic relief of the gravity flow pipeline in hilly areas,it was proposed to divide the water transmission pipeline into curved sections and straight sections with inclined angles.Using the limit idea,the curve fitting vectorization method based on tangent of the curved section was fitted to multiple equivalent short pipes with the same flow section along the center line of the pipeline.The combination of fitting equivalent short pipes and inclined straight pipes was used to calculate the water hammer,the numerical calculation model of gravity flow pipeline was established.A gravity flow pipeline water conveyance project in Qianyang County,Shaanxi Province was taken as an example to verify and analyze.By simulating the change law of water hammer pressure of the valve at the end of the pipeline at different valve closing times,it is concluded that the optimal valve closing time is 50 s≤T≤120 s,and corresponding water hammer protection schemes are proposed.The results show that the method has high accuracy in calculation and simulation,and it can provide reference for the construction and management of long-distance gravity flow pipeline water conveyance projects in hilly areas.

关 键 词：山丘区 自压输水管道 弯曲管道 关阀时间 水锤模拟 

分 类 号：S274[农业科学—农业水土工程]