Abstract
The propagation characteristics of premixed flame in a narrow tube with swirling flow have been examined by the numerical calculation. The flame is classified into three configurations for angular velocity and tube radius as follows : For smaller angular velocity, when the inlet velocity is small, the flame is able to stand only near the upstream boundary, and the flame reaches tube wall in the downstream. When the inlet velocity becomes larger, the flame blows off. For larger angular velocity, the flame is stable, but the flame does not reach tube wall so that the unburned mixture flows out. For intermediate angular velocity, the flame oscillates in the narrow tube.
