流量对河水滴灌重力沉沙过滤池内流速分布的影响  

Influence of flow rate on flow velocity distribution in gravity sinking and filter tank for drip irrigation with river water

作　　者：陶洪飞[1] 杨海华[1] 马英杰[1] 戚印鑫 耿凡坤 滕晓静 刘亚丽[1] Tao Hongfei Yang Haihua Ma Yingjie Qi Yinxin Geng Fankun Teng Xiaojing Liu Yali(College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi 830052, China Hydraulic Engineering Research Institute, Xinjiang Institute of Water Resources and Hydropower Research, Urumqi 830049, China)

机构地区：[1]新疆农业大学水利与土木工程学院,乌鲁木齐830052 [2]新疆水利水电科学研究院水工河工研究所,乌鲁木齐830049

出　　处：《农业工程学报》2017年第1期131-137,共7页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家科技支撑计划项目资助(2011Bad29B05);新疆农业大学博士后经费资助;新疆水利水电工程重点学科基金资助(xjslgczdxk20101202);复合应用型农林人才培养模式改革试点(农业水利工程)项目资助;新疆农业大学教研教改项目"农业水利工程专业卓越农林人才培养模式的改革"资助

摘　　要：为研究流量对河水滴灌重力沉沙过滤池流速分布规律的影响,该文对5种不同流量下的水沙两相流流场进行了数值模拟。通过对不同流量下流速沿程分布规律、流速沿水深方向分布规律及水沙分离效率的对比与分析,可知河水滴灌重力沉沙过滤池的适宜流量范围为0.05~0.2 m3/s,进水流量越小,流速变化幅度也就越小,越有利于泥沙沉降,水沙分离效率不小于72.5%。不同流量下沉淀池中流速沿程变化规律可分成3个阶段:流速迅速增加阶段、流速缓慢减小阶段和流速迅速减小阶段。清水池中流速方向与沉淀池的相反,流速沿程减小。受进水口、出水口和固体边界,以及侧向溢流堰的影响,不同流量下河水滴灌重力沉沙过滤池中的流速沿水深方向分布规律有差别。当流量为0.05和0.1 m3/s时,远离进水口、出水口及侧向溢流堰的位置,流速沿水深方向的分布规律包含流速迅速增加、流速缓慢减小和流速恒定3个阶段,而清水池则只包括流速迅速增加和流速恒定阶段。研究可对大首部的应用提供参考。Filters have high energy consumption, high cost and high water consumption and other shortcomings. In order to solve this problem, gravity sinking and filter tank for drip irrigation with river water（GSFTDIRW） is proposed, which consists of sedimentation tank, clear water tank and sewage tank. The flow is the key factor influencing the separation efficiency of water-sediment and the flow field of wate-sediment. This study investigated the influence of flow rate on the GSFTDIRW. A physical experiment was carried out in the hydraulic experiment hall of Xinjiang Institute of Water Resources and Hydropower Research. The parameters such as water depth, flow velocity and sediment concentration in the GSFTDIRW under flow rate of 0.05 m3/s were measured. The model was set up according to the model size used in the physical experiment in the gambit drawing software. Meanwhile, the boundary conditions were set in the gambit drawing software. Then the parameters were set in the Fluent software. Simulated values were processed by tecplot software. By comparing the experimental values and simulated values, it was shown that the porous media model was reliable in simulating the filter mesh. It was feasible to simulate the internal flow field in GSFTDIRW using the standard k-ε two-equation model and the mixture model. Based on these, the flow field of water-sediment two-phase flow was simulated in the GSFTDIRW under 4 different flow rates. By comparing the distribution of flow velocity along the length, the distribution of water velocity along water depth and the separation efficiency of water-sediment, it was found that the appropriate flow rate was in a range of 0.05-0.2 m3/s when the sedimentation tank was 25 m in length, 1.5 m in width, 0.80 m in height, slope 1%, and lateral overflow weir 5 m. At the same time, the average flow velocity of sedimentation tank is 0.053-0.19 m/s. The smaller the influent flow was, the smaller the velocity variation was. This was more conducive to sedimentation. The sediment concentration

关 键 词：灌溉 流量 流速 数值模拟 重力沉沙过滤池 流场 

分 类 号：TV14[水利工程—水力学及河流动力学]