caa a22 4500 606197095 CHVBK 20210128100927.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s00348-014-1873-7 doi (NATIONALLICENCE)springer-10.1007/s00348-014-1873-7 Active and passive flow control on a precessing jet [Elektronische Daten] [Hamed Babazadeh, David Nobes, Charles Koch] A precessing jet nozzle with water as the working fluid is investigated under passive and active flow control. The actuation effectiveness of 12 microjets around the nozzle inlet for active control of the precessing jet is the focus of this work. Passive control is also applied by modifying the geometry of the precessing jet either by adding a center body near the chamber exit or varying the chamber length. The flow behavior under control is studied using pressure measurement at the chamber exit plane to monitor jet precession. The pressure data are analyzed using a phase plane representation to determine the motion of the jets high-velocity region in the chamber exit plane. The standard deviation of the phase of the triggered pressure data is used for stability analysis. This analysis results in a phase diagram in terms of Reynolds number and actuation frequency. Active control can be utilized over a range of actuation frequencies (and corresponding Strouhal numbers) to control precession direction and stability which can be further enhanced with passive control mechanisms. However, the flow follows the actuation with the lowest variation when the active actuation matches with the natural Strouhal number $$(0.002<St<0.006)$$ ( 0.002 < S t < 0.006 ) of the nozzle jet flow. Springer-Verlag Berlin Heidelberg, 2014 Babazadeh Hamed Department of Mechanical Engineering, University of Alberta, T6G 2G8, Edmonton, AB, Canada aut Nobes David Department of Mechanical Engineering, University of Alberta, T6G 2G8, Edmonton, AB, Canada aut Koch Charles Department of Mechanical Engineering, University of Alberta, T6G 2G8, Edmonton, AB, Canada aut Experiments in Fluids Springer Berlin Heidelberg 56/1(2015-01-01), 1-10 0723-4864 56:1<1 2015 56 348 https://doi.org/10.1007/s00348-014-1873-7 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-014-1873-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Babazadeh Hamed Department of Mechanical Engineering, University of Alberta, T6G 2G8, Edmonton, AB, Canada aut NATIONALLICENCE 700 1- Nobes David Department of Mechanical Engineering, University of Alberta, T6G 2G8, Edmonton, AB, Canada aut NATIONALLICENCE 700 1- Koch Charles Department of Mechanical Engineering, University of Alberta, T6G 2G8, Edmonton, AB, Canada aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/1(2015-01-01), 1-10 0723-4864 56:1<1 2015 56 348