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基于分形理论更能准确地界定风口回旋区边界。建立COREX熔化气化炉的半周三维冷态模型,利用高速摄影的方法跟踪冷态模型内示踪粒子的运动,得到冷模型观察面板处风口回旋区的颗粒运动信息。通过对大量颗粒运动信息的处理得到风口回旋区范围的颗粒速度标量场,最后运用分形理论对利用不同颗粒速度大小等值线界定的回旋区边界的“不规则”程度进行了研究。结果表明:在回旋区内部颗粒快速运动的空腔区,分维数基本不变,且接近于欧几里得维数1;在停滞区,分维数也基本不变,其数值大致为1.4;从空腔区到停滞区分维数逐渐增大;将停滞区分维数基本不变的速度值作为界定回旋区边界的标准,可以确定回旋区的形状和大小,并可通过余维相加定律计算出三维风口回旋区的内表面积;为风口回旋区的宏观动力学计算以及数值模拟提供准确的边界条件。
Based on the fractal theory, the boundary of the tuyere area can be more accurately defined. The half-week cold model of COREX melting gasifier was established. The high-speed photogrammetry was used to track the movement of tracer particles in the cold model, and the particle motion information of the tuyere raceway in the cold model observation panel was obtained. The particle velocity scalar field in the tuyere convolution zone is obtained through the processing of a large number of particle motion information. Finally, the fractal theory is used to study the degree of “irregularity ” in the boundary of the cyclotron zone defined by the velocity contours of different particles. The results show that the fractal dimension of the cavity area moving rapidly within the raceway is almost constant and close to the Euclidean dimension 1; in the stagnation zone, the fractal dimension is also basically unchanged, and its value is about 1.4 ; The dimension of the cavity from the cavity to the stagnation gradually increases; and the velocity value of the stagnant fractal dimension is basically used as the criterion for defining the boundary of the cyclotron zone, the shape and size of the cyclotron can be determined and the law of addition of the extra dimension The inner surface area of the three-dimensional tuyere raceway is calculated, and the accurate boundary conditions are provided for the macro-dynamics calculation and numerical simulation of the tuyere raceway.