Laser-Doppler Analysis of the Air Flow Downstream of a Model Prefilming Spray Injector,
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 23, 1992
- Accession Number
- ADP008974
Entities
People
- I. S. Carvalho
- J. M. Barata
- M. V. Heitor
Organizations
- Technical University of Lisbon