底吹气体搅拌下熔池内流场的研究

The Modeling of Velocity fields in bottom blown argon stirred bath

  • 摘要: 本文将物理模型实验与数学模型数值求解相配合,对底吹气体揽拌下熔池内流场进行了研究。以湍流运动学方程和动力学方程、Harlow—Nakayama湍流k—ε双方程模型1及边界条件构成了所研究问题的数学模型,应用Spalding等计算湍流回流的方法2,对数学模型数值求解,得到熔池流场涡量,流函数、湍动能、湍动能耗散率、湍流旋涡粘性系数、速度、含气率及密度等的分布,计算与测定了三种工况,计算与实验结果吻合。

     

    Abstract: In this work, the gas-liquid two phase fluid flow and the recirculating flow field in the bottom blown argon stirred bath are studied by means of experiments carried with physical model together with numerical solutions of the mathematical model. The mathematical model consists of the turbulent flow mean vorticity transport equation and stream function equation. K-ε turb-ulance two equation model, the pure buoyance madel and the boundary conditions, The mathematical model is numerically solved implicitly using methed for solving recirculating flow problems developed by prof, Spalding, so that the flow pattern and dislributions of velocity,turbulence kinetic energy, turbulence kinetrc energy dissipation rate, vorticity, the turbulence viscosity, the density and the gas void fraction ratio are obtained. Velocity distribution computed agree well with those measured by laser Doppler anemometer, the computed flow patterns together with the position of the centre of the recirculation flows are in agreement with those obtained by photograpies taking from flow visualization. It shows that, the mathematical model together with its method of solution used arc acceptable for predicting the velocity field in domain of the problem worked, and this work therefore is of practical significamce.

     

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