Influence of trailing jet instability on the dynamics of starting jets

  1. Marugan-Cruz, C.
  2. Vera, M.
  3. Martínez-Bazan, C.
  4. Pawlak, G.
Book:
Progress in industrial mathematics at ECMI 2006
  1. Bonilla, Luis

Publisher: Berlin; New York : Springer, 2008

ISBN: 978-3-540-71991-5 978-3-540-71992-2

Year of publication: 2008

Pages: 758-762

Congress: ECMI conferences (14. 2006. Madrid)

Type: Conference paper

Abstract

The starting jet produced by the discharge of a submerged fluid stream through a circular orifice is investigated both numerically and experimentally for moderately large values of the jet Reynolds number, Re. Low-amplitude sinusoidal perturbations were superimposed to the jet exit velocity to reproduce the effect of flow perturbations on the trailing jet and leading vortex ring dynamics. While the trailing jet is strongly modified by flow perturbations, the evolution of the total circulation, as well as the leading vortex dynamics, remain relatively unaffected, and thus can be considered as more robust indicators of the dynamics of starting jets.