水刺机多孔式高压水腔三维流场分布数值分析

采用数值分析的方法研究水刺机多孔式高压水腔结构参数对水腔内部三维流场流动特征的影响。数值模拟结果表明：分流孔直径d1、均流棒直径d2和出流狭缝高度h这3个结构参数的变化对出流速度CD方向的分布、平均出流速度及静压力均有显著影响。根据模拟结果得出如下结论：d1=4mm, d2=30mm 分别是分流孔直径和均流棒直径的临界值，当d1小于4 mm或者d2大于30 mm时，出流口均有可能出现回流；分流孔直径d1的适宜范围为6～10 mm，均流棒直径d2的适宜范围为25～30 mm, 出流狭缝高度h的适宜值为40 mm。

Numerical analysis of three-dimensional flow field inside drilled-chamber of hydroentangling machine

The effects of chamber structure parameters on the three-dimensional flow performances of high pressure drilled-chamber of hydroentangling machine are investigated by numerical analysis method. The results show that the distribute hole diameter (d1), balance bar diameter (d2) and outflow slot height have significant effect on outflow velocity in cross-direction, average outflow velocity and static pressure. According to the results, it is concluded that d1=4 mm and d2=30 mm are the critical values of distribute hole diameter and balance bar diameter respectively. There might be backflow in the outflow surface when d1 is smaller than 4mm or d2 is larger than 30 mm. The proper value for the distribute diameter (d1) is ranging from 6 mm to 10 mm. The proper value for the balance bar diameter is in a range from 25 mm to 30 mm, and the proper value for outflow slot height is 40 mm.