| 李鹏， 吴璇*， 成福良， 吴文涵， 杨海鹏.基于格子玻尔兹曼法的连续式搅拌反应釜流场数值模拟[J].轻工机械,2024,42(5):27-34 |
| 基于格子玻尔兹曼法的连续式搅拌反应釜流场数值模拟 |
| Numerical Simulation of Continuous Stirred Tank Reactor Based on Lattice Boltzmann Method |
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| DOI：10.3969/j.issn.1005 2895.2024.05.004 |
| 中文关键词: 厨余垃圾 格子玻尔兹曼法 连续式搅拌反应釜 非牛顿流体 搅拌桨 |
| 英文关键词:food waste continuous stirred tank reactor lattice Boltzmann method non Newtonian fluids stirring paddle |
| 基金项目:2018年广西高校引进海外高层次人才“百人计划”资助。 |
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| 中文摘要: |
| 为探究高含固厨余垃圾条件下连续式搅拌反应釜（continuous stirred tank reactor，CSTR）的流场特性，课题组采用一种新颖的计算流体动力学方法格子玻尔兹曼法（lattice Boltzmann method，LBM）进行研究。模拟了3种桨型的流场特性，并通过对比不同转速下的扭矩实验值与模拟值，评估了该方法的可靠性，结果表明在低转速时实验值与模拟值的相对偏差均小于5%；随后考察了不同搅拌桨的速度分布、扭矩以及死区占比的变化情况。模拟结果显示：在处理含固体积分数为20%的厨余垃圾时，螺带式搅拌桨几乎带动整个反应釜内物料运动，并且其死区占比相对较小；使用螺带式搅拌桨时，随着转速的增加，反应釜中死区占比会有所下降。因此，综合考虑反应釜内的速度分布、扭矩及死区占比，用于搅拌高含固的厨余垃圾的连续式搅拌反应釜的最佳搅拌条件是转速为40 r/min的螺带式搅拌桨。课题组所提出的格子玻尔兹曼法方法可用于模拟低转速条件下高含固厨余垃圾的流动特性。 |
| 英文摘要: |
| In order to investigate the flow field characteristics of a continuous stirred tank reactor (CSTR) under high solid food waste conditions, a novel computational fluid dynamics method, namely the Lattice Boltzmann Method (LBM), was proposed. The flow field characteristics of the three paddle types were simulated, and the credibility of the method was assessed by comparing the experimental and simulated values of torque at different rotational speeds. The results demonstrated that the relative deviations between the experimental and simulated values at low rotational speeds were less than 5%. Subsequently, the variations in speed distribution, torque, and dead zone percentage of different stirring paddles were examined. The simulation results indicated that the speed of the screw type stirring paddle is capable of filling almost the entire reactor and exhibited a relatively low dead zone percentage when treating food waste with a 20% solids content. Subsequently, it is found that the dead zone in the reactor decreases as the speed of the screw belt stirring paddle increases. Therefore, the optimum mixing condition for a continuous stirred tank reactor (CSTR) for mixing food waste with a high solid content is a screw belt stirring paddle with a rotational speed of 40 r/min. The lattice Boltzmann method approach proposed in this paper can be used to simulate the flow characteristics of high solid content food waste under low rotational speed conditions. |
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