小浪底水库泥沙管道输送的阻力损失分析

Resistance loss of sediment pipeline transportation at Xiaolangdi reservoir

阻力损失是管道水力输送的关键参数之一。本文基于小浪底水库的管道排沙试验,研究不同流速、粒径、浓度下管道输送的阻力损失,采用实测数据与已有模型对比分析的方法,选取拟合效果最好的模型。流速为2.08m/s时,阻力模型与费祥俊模型拟合最好,杜兰德模型次之。因此在试验参数确定中综合考虑费祥俊与杜兰德模型。在本次试验流量为620 m3/h(流速2.08 m/s)、含沙量为279 kg/m3(浓度10.53%)、中值粒径为0.0512 mm的参数组合下,管道排沙效果相对较好,月排沙量为4.15×104t;而基于本次试验条件,预测高浓度时的输沙情况,最佳输送参数应是流量620 m3/h(流速2.08 m/s)、含沙量为950 kg/m3(浓度35.85%)、中值粒径为0.0512 mm,月排沙量为14.14×104t。

The resistance loss is one of the key parameters of pipeline transportation. Based on the pipeline flushing test at Xiaolangdi Reservoir,this article studied the resistance loss of pipeline transportation in different flow rates,particle sizes and concentrations. It took the method of measured data with model and chose the model which has the best fitting effect. During the test,when the flow speed is 2. 08 m / s,the fitting effect of resistance model with Fei Xiangjun model is the best,Durand model is the second. So the paper comprehensively considered the models of both Fei Xiangjun and Du Lande in the determination of parameter. In this experiment,the discharge is 620 m^3/ h（ flow rate is 2. 08 m / s）,the sediment concentration is 279 kg / m^3（ concentration 10. 53%）,and the median particle size is 0. 0512 mm,the sand flushing effect is better,the monthly sediment discharge is 41500 t. Based on condition of this test,the paper predicted the sand flushing effect of higher sediment concentration. The optimal parameters are that the discharge is 620 m^3/ h（ flow rate is 2. 08 m / s）,the sediment concentration is 950 kg / m^3（ concentration 35. 85%）,and the median particle size is 0. 0512 mm,the monthly sediment discharge is141400 t.