关键词: 混合室, 设计, 计算流体力学, 数值模拟, 浆料分布

Abstract: In order to improve performance of pulp distribution of new distributor，three structures of mixing chamber were designed，namely single cavity mixing chamber （mixing chamberⅠ），multicavity mixing chamber with two sets of branch pipes as a unit （mixing chamberⅡ），multicavity mixing chamber with a set of branch pipe as a unit （mixing chamberⅢ），and computational fluid dynamics（CFD） was used to simulate flow characteristic in three mixing chambers. The results showed that in the mixing chamberⅠ，there was strong interference effect between two adjoining jet-flows in a row parallel pipes and jet-flows assembled to central section in mixing chamber. So the mass flow rate out of mixing chamber in center was obviously higher than two sides. In the mixing chamberⅡ，two sets of jet-flow in a mixing chamber could have a good mixture and avoided phenomenon of jet-flows aggregation. In the mixing chamber Ⅲ，there were only two jet-flows of corresponding branch pipe in every mixing chamber and complementary mixture was really realized. From the viewpoint of distribution of mass flow rate out of mixing chamber，the curve of mass flow rate of mixing chamberⅢ was much gentler than mixing chamberⅠ and mixing chamberⅡ. Maximum deviation of mass flow rate to expected value in mixing chamberⅢ was only 0.254%，obviously smaller than 0.538% in mixing chamberⅠand 0.294% in mixing chamberⅡ.

Key words: mixing chamber, design, computational fluid dynamics, numerical simulation, distribution of pulp