H_2/Ar等离子体射流反应器的模拟

SIMULATION OF H_2/Ar THERMAL PLASMA JET REACTOR

建立了直流电弧等离子体射流反应器的计算流体动力学模型 ,在模型中同时考虑流动、对流换热和共轭热传导等过程 ,消除了以往对反应器内壁温度估计造成的误差 .对湍流的模拟采用了常见的标准k -ε双方程湍流模型 .

The mathematical model based on Computational Fluid Dynamics (CFD) technique is developed for the direct current arc plasma jet reactor in order to optimize the reactor structure and operation conditions for the direct production of acetylene from coal by thermal plasma technique. In this model , fluid flow, convective heat transfer, and conjugate heat conductivity are considered simultaneously on the basis of rational assumption. It avoids the error caused by estimating the temperature of inner wall of the reactor. Realistic allowance is made for turbulent behavior, temperature-dependence property value, and boundary conditions. The thermodynamic and transport properties of H2/Ar system, which are usually expressed in the tables of discrete data, are fitted into the expressions that can be easily inserted in the program. Simulations of turbulence is carried out by commonly used standard k-Ε two equation turbulence model. The temperature field and velocity field in the plasma jet reactor are calculated by using SIMPLEST algorithm. The conclusion obtained provides guidance for further experiment and technical development.