@inproceedings{13bf0aa9a78f49bf8b8201fdfb45ae2c,
title = "Active control of a round jet using two unsteady microjets",
abstract = "Unsteady microjets are used to control the mixing performance of a round jet at a Reynolds number of 8000. Two microjets were placed at diametrically opposite locations upstream of the nozzle exit. We explored the effects of the mass rate ratio Cm and forcing frequency ratio fex/f0 of the microjets on the primary jet, where fex is the microjet forcing frequency and f0 the predominant vortex frequency in the free jet. The Cm and fex/f0 examined are 0 ∼ 15.4\% and 0 ∼ 1.28, respectively. The flow was measured using hot wire, flow visualization and particle imaging velocity techniques in two orthogonal planes through the jet axis. The jet centreline decay rate exhibits a strong dependence on fex /f0. Given fex /f0 ≈ 1.0, this decay rate displays three types of distinct behaviours for Cm investigated in terms of the response of large-scale coherent structures to the control, which is different from previous studies. The flow physics and control mechanisms are explored.",
author = "P. Zhang and Y. Zhou and \{Mahbub Alam\}, Md",
year = "2012",
language = "英语",
series = "Proceedings of the 18th Australasian Fluid Mechanics Conference, AFMC 2012",
publisher = "Australasian Fluid Mechanics Society",
editor = "P.A. Brandner and B.W. Pearce",
booktitle = "Proceedings of the 18th Australasian Fluid Mechanics Conference, AFMC 2012",
note = "18th Australasian Fluid Mechanics Conference, AFMC 2012 ; Conference date: 03-12-2012 Through 07-12-2012",
}