有压输水系统中用射流冲沙的系列模型试验研究

Model study on forced erosion using impinging jet in pressured water transportation system

射流冲沙是解决有压输水系统中局部泥沙淤积问题的一种方法 ,为确定射流冲沙的主要参数和冲沙效果 ,进行了几何比尺分别为 1∶2 5及 1∶12 5的系列泥沙模型试验 .通过试验发现冲沙效果和射流动能 ρQV2 有关 ,且通过系列比尺模型试验 ,得出射流冲沙的临界判别条件是保持动能为某一临界值 ,通过进一步分析还得出射流能量中能转化为水流紊动能量的百分比 .通过算例给出了有压输水系统中计算射流冲沙参数的方法 .

The effectiveness of forced erosion by means of impinging jet to minimize the local deposit inside of the pressured transportation system is studied experimentally in lab.A series of model test is carried out.It is found out that the effectiveness is closely related to the dynamic energy of the jet.There is a critical value of dynamic energy at which the situation of no deposition can be maintained.The percentage of jet energy to be transformed into turbulent energy is further studied.An example is given for demonstration.