Publication: Effect of base flownon-parallelism on the local linear stability of low-density jets
Loading...
Identifiers
Publication date
2014-06
Defense date
2014-07-11
Authors
Advisors
Tutors
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
The effect of retaining base flow non-parallelism in the local linear spatiotemporal
stability analysis of slender low-density jets, discharging from a round
injector into a quiescent ambient, is studied in the present work.
Retaining base flow non-parallelism in the local linear stability analysis was
found to have a stabilizing effect in the flow closer to the injector exit. This
effect was greater the lower the values of the Reynolds number and the initial
momentum thickness of the velocity profile at the injector exit.
When comparing the results obtained to existing experimental data, maintaining
the base flow non-parallelism in the analysis gave better agreement with
the experimental data than not taking base flow non-parallelism into account.
Furthermore, it changed the evolution of the local stability properties so that a
more theoretically sound criteria could be used in determining the absolute or
convective unstable nature of the flow. This allows to reduce the uncertainty in
the stability description of the flow when base flow non-parallelism is retained
in the stability analysis.
Description
Keywords
Dinámica de fluidos, Aeronáutica, Estabilidad