基于试验数据拟合的甲烷反应器流动仿真分析

Simulation of methane reactor flow based on experimental data fitting

为研究甲烷反应器压降影响因素,基于某船舶发动机甲烷反应器试验测试数据,拟合多孔介质流体惯性阻力系数和黏性阻力系数,利用STAR-CCM+建立反应器模型并进行仿真计算,研究反应器内部流场均匀性及压降。结果表明:流体惯性阻力系数为340.82 kg/m^(4),流体黏性阻力系数为1437.27 kg/(m ^(3)·s)时,仿真模型取得最优拟合结果;反应器压降主要由催化剂层的压降导致;催化剂入口废气流速均匀性达97%,废气分布均匀;催化剂废气温度影响平均流速,使试验压降与仿真压降有一定偏差。

Based on the experimental data of a certain ship engine methane reactor,the inertia resistance coefficient and viscosity resistance coefficient of porous media fluid are fitted.A reactor model is established using STAR-CCM+and simulations are conducted to study the uniformity of the internal flow field and pressure drop in the reactor.The results show that when the fluid inertia resistance coefficient is 340.82 kg/m^(4) and the fluid viscosity resistance coefficient is 1437.27 kg/(m^(3)·s),the simulation model achieves the best fitting result.The pressure drop in the reactor is mainly caused by the pressure drop in the catalyst layer.The uniformity of exhaust gas flow rate at the catalyst inlet reaches 97%,which indicates a uniform distribution of exhaust gas.The temperature of catalyst exhaust gas affects the average flow rate,causing a certain deviation between the experimental pressure drop and the simulated pressure drop.