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Abstract
The flowfield immediately downstream of an annular vane swirler is investigated to aid in computer modeling of flowfields, and in the development and evaluation of turbulence models for swirling confined flow. The swirler studied is annular with a hub-to-swirler diameter ratio of 0.25, and 10 adjustable flat untwisted vanes with a pitch-to-chord ratio of 0.68. Measurements of time-mean axial, radial, and swirl velocities are made at the swirler exit plane, using a five-hole pitot probe technique with computer data reduction. The time-mean velocity components measured at the swirler exit plane show clearly the effects of centrifugal forces, recirculation zones, and blade wakes on the exit-plane velocity profiles. Nonaxisymmetry is present in all swirl cases investigated. Assumptions of flat axial and swirl profiles are found to be progressively less realistic as the swirl vane angle increases, with axial and swirl velocities peaking strongly at the outer edges of the swirler exit and significant nonzero radial velocities present.
Published Version
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