细颗粒煤粉的密实过程及其对起动流速的影响

Compact Process of Fine Powdered Coal and Its Influence on Threshold Velocity

在实体泥沙模型试验中，煤粉是常用模型沙．它在长系列实体泥沙模型试验中，与细颗粒泥沙运动特性有误差．通过水槽试验，研究了细颗粒煤粉干容重随淤积历时的变化，探讨了其密实机理及对起动流速的影响．试验结果表明煤粉的沉积密实程度对起动流速有一定程度的影响．

Sediment physical modelling is a reliable method to solve sediment problems in engineering practive In the modelling fine powdered coal is widely used Sediment model test results on the Three Gorges project carried out by different research institutes are and it is found that these results are in agreement in property, but there are some differences in numerical value, especially in the long duration sediment physical model experiment, where problems in similarity of fine sediment motion characteristics is less studied For analysis of the reasons why there are variations in sediment model test results, by means of flume experiment, the process of dry unit weight of fine powdered coal under water is studied, the mechanism of compact of fine powdered coal and its influence on the threshold velocity are also explored The experiment results show that the compact degree of fine powdered coal has some influence on threshold velocity