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以转炉熔池模型为对象,用激光多普勒测速仪对熔池内不同工况下的速度分布和循环流量进行了测试和研究。试验工况包括:不同比例的水和甘油配成四种不同粘度的液体进行对比和熔池表面加渣与不加渣对比。每一情况都分别在四种流量条件下进行了测试。试验表明:(1)底吹流量改变时,熔池流场的速度大小有变化,但速度分布相似。(2)熔池表面加上液体渣后,循环流量降低10%左右,其影响程度与渣层的厚度和性质有关。(3)熔池内的液体是水或性质相近的液体时,循环流量大约与底吹气量的1/4次幂成正比。这一关系对有渣或无渣都适用。(4)熔池的循环流量与熔池内液体的运动粘性系数的0.06次幂成正比,这说明熔池内液体的粘度对搅拌混合影响不大,只有粘度相差1～2个数量级时影响才显著。
Taking the converter pool model as an example, the laser Doppler velocimeter was used to measure and study the velocity distribution and circulation flow under different operating conditions. Test conditions include: different proportions of water and glycerol dubbed four different viscosities of the liquid compared with the molten pool surface slag and non-slag contrast. Each case was tested under four different flow conditions. The experimental results show that: (1) When the bottom blowing flow changes, the velocity of the molten pool flow field changes, but the velocity distribution is similar. (2) When the liquid slag is added to the surface of the molten pool, the circulation flow rate is reduced by about 10%, and the influence degree is related to the thickness and the nature of the slag layer. (3) When the liquid in the bath is water or a liquid of a similar nature, the circulation flow is approximately proportional to 1/4 of the power of the bottom blowing gas. This relationship applies to both slag and non-slag. (4) The circulating flow of the molten pool is proportional to the 0.06 power of the kinematic viscosity coefficient of the liquid in the molten pool. This shows that the viscosity of the liquid in the molten pool has little effect on the mixing and mixing, and the effect is significant only when the viscosities differ from one to two orders of magnitude.