Five-hole pitot probe time-mean velocity measurements in confined swirling flowsNonswirling 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 flow-field are investigated, among them side-wall 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 five-hole pitot probe enabling three time-mean 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.
Document ID
19830035427
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Yoon, H. K. (Oklahoma State Univ. Stillwater, OK, United States)
Lilley, D. G. (Oklahoma State University Stillwater, OK, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
AIAA PAPER 83-0315
Meeting Information
Meeting: American Institute of Aeronautics and Astronautics, Aerospace Sciences Meeting