Annular vane swirler performance

The flowfield immediately downstream of an annular vane swirler is investig ated to aid in computer modeling of flowfields, and in the development and evaluation of turbulence models for swirling confined pow The swirler studi ed is annular with a hub-to-swirler diameter ratio of 0.25, and 10 adjustab le flat untwisted vanes with a pitch-to-chord ratio of 0.68. Measurements o f time-mean axial, radial, and swirl velocities are made at the swirler exi t plane, using a five-hole pitot probe technique with computer data reducti on. The time-mean velocity components measured at the swirler exit plane sh ow clearly the effects of centrifugal forces, recirculation zones, and blad e wakes on the exit-plane velocity profiles. Nonaxisymmetry is present in a ll swirl cases investigated. Assumptions of flat axial and swirl profiles a re found to be progressively less realistic as the swirl vane angle increas es, with axial and swirl velocities peaking strongly at the outer edges of the swirler exit and significant nonzero radial velocities present.