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Near-Field Characteristics of a Jet With a Coil-Insert Injector

[+] Author Affiliations
Hamid R. Rahai, Ayaz Alware, Daniel Carpio, Eyass Khansa

California State University at Long Beach

Paper No. IMECE2006-13728, pp. 443-451; 9 pages
  • ASME 2006 International Mechanical Engineering Congress and Exposition
  • Fluids Engineering
  • Chicago, Illinois, USA, November 5 – 10, 2006
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-4770-5 | eISBN: 0-7918-3790-4
  • Copyright © 2006 by ASME


Simultaneous time resolved measurements of two components of turbulent velocity and their cross moments are made at the exit and downstream of an axisymmetric jet with a coil-insert injector. The coil-insert injector is a coil shaped tube with ratios of coil diameter, pitch spacing and length to the jet inside diameter of 0.1, 1.0, and 1.5 respectively. The coil had three round holes of 0.2 mm diameter at the middle of each pitch for radial injection. The volume flow ratios of the radial blowing to the axial flow were 0.075, 0.10, 0.125, and 0.15. Results indicate that the radial blowing enhances asymmetry and increased generation of turbulence intensities at the jet outlet. However, increased entrainment and mixing between the injected flow and the axial flow reduces the asymmetry downstream, resulting in relatively constant intensities in the region with high axial momentum.

Copyright © 2006 by ASME
Topics: Ejectors



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