钢包水模型比例对混匀时间测量误差的影响

Influence of scale factor of water model of steel ladles on mixing time measurement error

为了研究钢包水模型比例对混匀时间的影响,采用几何相似比分别为1/4.5、1/7.4、1/10、1/17.3的有机玻璃水模型进行了物理模拟试验。使用电导率仪测量了钢包模型内流体在不同条件下的混匀时间,结果表明,模型比例对搅拌功率与混匀时间的拟合曲线的指数n值有影响。随着模型比例的增加,n值的绝对值逐渐减小,其中,模型比例小于1/7.4时,n值变化较大,n值的拟合直线斜率为-3.97;当模型比例大于1/7.4时n值变化不大,n值的拟合直线斜率为-0.19。同时,对于中心吹气和偏心吹气,n值的变化范围也不相同,当中心吹气时,n值的变化范围为0.25~0.75;偏心吹气时,n的变化范围为0.30~0.60。

In order to study the influence of the geometric similarity scale factor of the water model on the mixing time, the physical simulation experiments were carried out with the plexiglass water model with the geometric similarity scale of 1/4.5, 1/7.4, 1/10 and 1/17.3, respectively. The mixing time of the fluid in the ladle model under different conditions was measured by the conductivity meter. The results showed that the geometric similarity scale factor of the model has an effect on the exponential n of the fitting curve between the mixing power and the mixing time. With the increase of the model scale, the absolute value of the n gradually decreased. When the model scale was less than 1/7.4, the n changed greatly, and the slope of the fitting line of the n was-3.97;when the model scale was greater than 1/7.4, the n changed little, and the slope of the fitting line of the n was-0.19. At the same time, for central and eccentric blowing, the change range of n was also different. When central blowing, the change range of n was 0.25-0.75;when eccentric blowing, the change range of n was 0.30-0.60.