caa a22 4500 477093523 CHVBK 20180405111521.0 cr unu---uuuuu 170330e19961101xx s 000 0 eng 10.1007/BF00189047 doi (NATIONALLICENCE)springer-10.1007/BF00189047 Phase averaged velocity field in an axisymmetric jet subject to a sudden velocity decrease [Elektronische Daten] [J. Borée, N. Atassi, G. Charnay] An unsteady transient axisymmetric turbulent jet was studied experimentally. The initial flow perturbation consisted of a sudden and large decrease in the ejection velocity. The temporal evolution of the mean and fluctuating unsteady velocity field was measured by using X hot-wire probes. In the jet far field, adaptation of the externally imposed unsteadiness to the local jet time scale is confirmed quantitatively. The main features of the phase averaged velocity field are presented and comments are made about the instantaneous state of the turbulence energetics. Transient mean radial velocities are deduced and an important increase of the instantaneous rate of entraining external fluid into the jet is found. Finally, we show that the pressure effect due to radial impusle terms plays an important role in the propagation of the mean perturbation. The longitudinal adaptation of the perturbation time scale driven by the local jet time scale provides a turbulent flow that is intermediate to quasi-static flows and rapidly distorted flows. Springer-Verlag, 1996 Borée J. Institut de Mécanique des Fluides de Toulouse, UMR CNRS/INPT-UPS 5502, Avenue Camille Soula, F-31400, Toulouse, France aut Atassi N. Institut de Mécanique des Fluides de Toulouse, UMR CNRS/INPT-UPS 5502, Avenue Camille Soula, F-31400, Toulouse, France aut Charnay G. Institut de Mécanique des Fluides de Toulouse, UMR CNRS/INPT-UPS 5502, Avenue Camille Soula, F-31400, Toulouse, France aut Experiments in Fluids Springer-Verlag 21/6(1996-11-01), 447-456 0723-4864 21:6<447 1996 21 348 https://doi.org/10.1007/BF00189047 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00189047 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Borée J. Institut de Mécanique des Fluides de Toulouse, UMR CNRS/INPT-UPS 5502, Avenue Camille Soula, F-31400, Toulouse, France aut NATIONALLICENCE 700 1- Atassi N. Institut de Mécanique des Fluides de Toulouse, UMR CNRS/INPT-UPS 5502, Avenue Camille Soula, F-31400, Toulouse, France aut NATIONALLICENCE 700 1- Charnay G. Institut de Mécanique des Fluides de Toulouse, UMR CNRS/INPT-UPS 5502, Avenue Camille Soula, F-31400, Toulouse, France aut NATIONALLICENCE 773 0- Experiments in Fluids Springer-Verlag 21/6(1996-11-01), 447-456 0723-4864 21:6<447 1996 21 348 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer