聚脲喷枪混合室的设计和FLUENT仿真分析

为提高聚脲喷涂喷枪的混合效果，基于撞击流理论设计了一种新型聚脲喷涂喷枪的混合室。混合室采用两级撞击混合，分别采用两组T型和两组Y型对撞混合形式。利用SolidWorks设计混合室的结构模型后，利用FLUENT软件，采用冷、热水在混合室内撞击混合、对流传热的方法进行仿真模拟，并且计算了流体在混合室内的微观混合时间。结果表明:合理增加撞击流混合室的混合级数和采用多组T型、Y型对撞混合形式可增益混合效果；撞击流混合室的主要混合区是在撞击区；流体在喷枪内停留的总时间约为5.71 ms，满足具有反应迅速这一特性的材料的混合要求；微观混合时间小于1 ms，混合效果优异。 

Mixing chamber design of polyurea spray airbrush and simulation analysis based on FLUENT

In order to improve the mixing effect of polyurea spray airbrush, a novel mixing chamber of polyurea spray airbrush was designed based on impinging streams principle. The mixing chamber adopted two level impingement mix and respectively used two groups of T types and Y types. After the mixing chamber model was designed by the SolidWorks, we used FLUENT to simulate with the methods of convective heat transfer and the impingement mix of the cold and hot water in the mixing chamber and calculated the micromixing time that the fluid stayed in the mixing chamber. The results showed that under rational conditions, the more multiplicity the mixing stages and impingement modes of T types and Y types are, the better mixing effects the impinging streams mixing chamber will be. The main mixing zone of impinging streams mixing chamber is the impinging area. In the spray airbrush, the total staying time of the fluid is about 5. 71 ms, which meet the requirements that some materials have the features of quick mixing. The micromixing time is less than 1 ms, so the mixing effect is very good.