Further timemean measurements in confined swirling flows
Abstract
Nonswirling and swirling nonreacting flows in an axisymmetric test section with an expansion ratio D/d = 2, which may be equipped with contraction nozzles of area ratios 2 and 4, are investigated. The effects of a number of geometric parameters on the flowfield are investigated, among them sidewall expansion angles of 90 and 45 deg, swirl vane angles of 0, 38, 45, 60, and 70 deg, and contraction nozzle locations L/D = 1 and 2 (if present). Data are acquired by means of a fivehole pitot probe enabling three timemean velocity components in the axial, radial, and azimuthal directions to be measured. The velocities are extensively plotted and artistic impressions of recirculation zones are set forth. The presence of a swirler is found to shorten the corner recirculation zone and to generate a central recirculation zone followed by a precessing vortex core. A gradual inlet expansion has the effect of encouraging the flow to remain close to the sidewall and shortening the extent of the corner recirculation zone in all cases investigated.
 Publication:

AIAA Journal
 Pub Date:
 April 1984
 DOI:
 10.2514/3.8431
 Bibcode:
 1984AIAAJ..22..514L
 Keywords:

 Flow Velocity;
 Pitot Tubes;
 Swirling;
 Velocity Measurement;
 Flow Geometry;
 Nozzle Flow;
 Test Facilities;
 Vanes;
 Velocity Distribution;
 Fluid Mechanics and Heat Transfer