Accession Number : ADP008974

Title :   Laser-Doppler Analysis of the Air Flow Downstream of a Model Prefilming Spray Injector,

Corporate Author : TECHNICAL UNIV OF LISBON (PORTUGAL)

Personal Author(s) : Barata, J. M. ; Carvalho, I. S. ; Heitor, M. V.

Report Date : 23 JUL 1992

Pagination or Media Count : 8

Abstract : Laser-Doppler measurements of the mean and turbulent velocity characteristics of coaxial jets stabilized downstream of a model prefilming airblast atomizer with a conical shape are presented and discussed together with visualization of the flow. The results include the analysis of the effect of swirling the outer jet on the mixing performance of the injector and consider the use of two different swirl generators. Flat vanes upstream of the present conical nozzle promotes the instability and rolling up of the shear layer and leads to some asymmetric flow with a spiral pattern associated with increased turbulence levels far downstream of the nozzle exit. The use of a swirl chamber with tangential slots gives rise to the occurrence of a recirculation zone in the vicinity of the nozzle, which is penetrated by the inner jet and is associated with increased turbulence levels. (Author)

Descriptors :   *FUEL SPRAYS, *ATOMIZATION, *LIGHT SCATTERING, LASER BEAMS, DOPPLER SYSTEMS, JET FLOW, EDDIES(FLUID MECHANICS), COAXIAL CONFIGURATIONS, AIR FLOW, PORTUGAL.

Subject Categories : Fluid Mechanics
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE