Analysis and determination of critical nonsilting velocity of muddy water conveyance pipelines in Yellow River irrigation districts
HE Wu-Quan, CAI Ming-Ke, HE Xin-Ye, ZHANG Chen-Di
(1. College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China; 2. Key
Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A＆F University,
Yangling, Shaanxi 712100, China)
Abstract：Sediment problem is the key factor that restricts the development of pipeline water conveyance irrigation engineering in Yellow River irrigation districts. In order to solve this problem, it is necessary to reasonably determine a critical nonsilting velocity of water conveyance pipelines in Yellow River irrigation districts. In doing so, a series of experiments on muddy water transport in pipelines were carried out by using four kinds of size of pipe diameter and six groups of sediment concentrations which were mixtures of water and various sand contents. Then influences of sand density, particle size, sediment concentration and pipe diameter on the critical nonsilting velocity were analyzed. The results showed that as the pipe diameter and sand density remain unchanged, the critical nonsilting velocity is increased with increasing sediment concentration. If the sediment concentration and sand density are kept constant, then the critical velocity is increased with increasing pipe diameter. The influence of sand density and particle size on the critical nonsilting velocity is also very obvious, especially for the sand particles with a size close to the upper limit of sand particle size (d90 or d95), which often deposit in the bottom of a pipe initially. Further, an empirical formula for calculating the critical nonsilting velocity was established based on the sediment suspension efficiency coefficient and the suspended sediment energy dissipation principal. The sediment suspension efficiency coefficient has been determined by the experimental data. It was confirmed that the maximum error is 2.958% between the predicted critical velocity and experimental one.
何武全, 蔡明科, 何欣烨, 张晨笛. 引黄灌区浑水管道输水临界不淤流速分析与计算[J]. 排灌机械工程学报, 2013, 31(1): 36-40.
HE Wu-Quan, CAI Ming-Ke, HE Xin-Ye, ZHANG Chen-Di. Analysis and determination of critical nonsilting velocity of muddy water conveyance pipelines in Yellow River irrigation districts. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(1): 36-40.
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