Investigations of an enclosed annular rotor-stator system with LES method

• 来源期刊: 中国科学:物理学 力学 天文学（英文版）
• 年，卷（期）: 2018,（11）
• 页码范围: 50-60
• 页数: 11页
• 语种: 英文

摘要

In this study,the flows in an enclosed annular rotor-stator system with the Reynolds number ranging from 0.75 × 105 to 3.75 × 105 and an aspect ratio of 36.5 are investigated using the LES method.Few studies have explored such a rotor-stator system with this aspect ratio and the flow structure on the rotor side.The mean flow structure varies from a torsional Couette type to a Batchelor type as the Reynolds number increases.The onset of the instability in the B(o)dewadt layer adjacent to the stator is delayed,whereas it is promoted in the Ekman layer adjacent to the rotor.Both the layers demonstrate rich spiral structures.Turbulent spirals are observed to occur at the rotor disk side that also generates TS-wave-like (Tollmien-Schlichting) structures between adjacent spiral arms.Further,the turbulence at the stator is complex and interesting.Statistically,the turbulence is highly anisotropic near both the rotating and nonrotating disks,which is depicted by the Reynolds stresses.