Analysis of Flow Field in Vertical Roller Mill Chamber Based on Turbulent Models

Mixture multiphase flow model and several common turbulent models of the computational fluid dynamics (CFD) are chose. According to the two-phase turbulent coupling characteristic of powder, hot-air flow field and the operation data of the vertical roller mill chamber, it analyzed three-dimensional flow of the chamber using standard turbulent model, RNG turbulent model and Reynolds stress equation model (RSM). The results show that high pressure flow region enhancing separation efficiency is formed between the wall surface of chamber and the side of table. High speed flow in the end of the high pressure region improves the transportation efficiency of powder. The chamber internal flow field has part turbulent anisotropy. Especially, turbulent pulse between the table and gray bucket is significant.