充填料浆L型管自流输送偏移特性研究

为了研究充填料浆在L型管自流输送时的偏移特性,将充填倍线、充填管径、质量浓度作为影响因素,进行了正交设计和计算流体力学(CFD)试验。研究发现:流速最大处偏移不一定最大;弯管处每个位置的最大流速皆随管径增大而减小,随质量浓度增大而增大;每个位置的偏移量均随管径增大而增大;影响最大偏移量的显著性和敏感性均为充填管径>充填倍线>质量浓度,其中充填管径为显著因素;最大偏移出现位置随充填管径增大下移,随质量浓度增大上移;最大流速出现位置随充填管径增大下移,随质量浓度增大上移,随充填倍线增大下移。建立了反映3因素下弯管最大偏移量的数学预测模型,并设计了4组验证试验,计算值与试验值差率均在2.5%以下,证实了该预测模型有效。

Flow Characteristics of Slurry Backfill Transported by Gravity in a L-shaped Pipe

In order to study the flow characteristics of slurry backfill transported by gravity in a L-shaped pipe, an orthogonal experiment and computational fluid dynamics technology (CFD) test were conducted with backfilling time line(N), pipeline diameter(D) and slurry concentration(c) as the influencing factors. It is found that the maximum flow rate does not necessarily lead to maximal drift of the slurry from the center line of the pipe. At each position of elbow, the maximum flow rate decreases with an increase of D, but increases with an increase of c, the drift of slurry at each position increases with the increase of D. The impact on the drift brought by the influencing factors is shown in the following descending order: D>N>c, indicating D contributes largely to the drift of slurry. And the drifting position moves downward as D increases, but moves upward as c increases. The position with the largest flow rate moves downward as D increases and N increases, but moves upward as c increases. Then, a mathematics model was constructed for predicting the maximum drift based on these three factors, and four sets of tests were designed for verification. It is shown that the errors between the calculation value and experimental results are below 2.5% by average, proving this prediction model is valid.