聚氨酯低压混合器内流场的数值模拟和实验研究

发布时间：2018-09-02 08:54

【摘要】：为探究聚氨酯低压混合器内流体流动状况以及不同混合头结构对混合器内组分输运过程的影响,利用流体力学软件Fluent,采用标准湍流模型和标准壁面函数,开启组分输运方程,不开启反应方程,对混合器内非稳态组分输运过程进行三维数值模拟。模拟结果表明:混合器内流体流动状况良好,无明显死区,混合器内组分输运过程混合时间为30 s;当叶片层数为8、周向叶片数为8、叶片倾斜角为15°时,混合头的混合效果最好。为验证模拟的可靠性,对混合器内组分输运过程进行实验验证。结果显示:模拟结果与实验数据具有较高的吻合度,最大相对误差低于5%,这表明利用CFD模型对低压混合器内组分输运过程进行预测和模拟是可行的、有效的。
[Abstract]:In order to investigate the fluid flow situation in low pressure polyurethane mixer and the influence of different mixing head structure on the transport process of components in the mixer, the standard turbulence model and standard wall function were used to open the component transport equation by using the fluid dynamics software Fluent,. The unsteady component transport process in the mixer is simulated by three dimensional numerical simulation without opening the reaction equation. The simulation results show that the fluid flow in the mixer is in good condition, there is no obvious dead zone, the mixing time is 30 s during the transport of components in the mixer, and when the number of blade layers is 8, the number of circumferential blades is 8, and the angle of blade inclination is 15 掳, the mixing effect of the mixing head is the best. In order to verify the reliability of the simulation, the component transport process in the mixer was experimentally verified. The results show that the simulation results are in good agreement with the experimental data, and the maximum relative error is less than 5. This indicates that it is feasible and effective to use CFD model to predict and simulate the transport process of components in the low pressure mixer.
【作者单位】：上海应用技术大学;上海化工研究院;
【基金】：上海市自然科学基金资助项目(14ZR1420800)
【分类号】：TQ051.71

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