基于两相流动数值模拟的清淤系统对冲循环影响因素研究

Study on Influence Factors of Opposite-flush Cycle in Dredging System Based on Two-phase Flow Numerical Simulation

通过正交试验探究了沉积物密度、沉淀体积分数、对冲管出口高度以及对冲管位置对水仓清淤系统对冲效果的影响,并采用Eulerian多相流模型以及κ-ε湍流模型进行数值模拟试验。结果表明:沉积物密度越大,对冲作用效果越差;沉积物密度与对冲出水口高度有较强的交互作用,沉积物密度越大,对冲管路出口高度应越低,而淤泥密度越小,对冲管路出口高度应越高;存在一个对冲效果较为优化的体积分数;淤泥体积分数较大时分次对冲;淤泥密度较大时,在体积分数较小时对冲效果较好,淤泥密度较小时,体积分数可稍大。

The influence of sediment density,sediment volume fraction,outlet height of the oppositeflush pipe and location of the opposite-flush pipe on the opposite-flush effect of the water tank dredging system was investigated through orthogonal experiment,and Eulerian multiphase flow model andκ-εturbulent model were used for numerical simulation test.The results show that the higher the sediment density is,the worse the opposite-flush effect is.The sediment density has a strong interaction with the height of the flushing outlet.The higher the sediment density,the lower the outlet height of the opposite-flush pipe,while the lower the sludge density,the higher the outlet height of the oppositeflush pipe.There is a volume fraction with optimized opposite-flush effect.Flushing should be carry out several times when sludge volume fraction is large.When the sludge density is large,the opposite-flush effect is better with a small sludge volume fraction.Conversely,the volume fraction can be slightly larger.