Flow visualization using a novel form of stereoscopic viewing system has been applied in the near field of an axisymmetric turbulent jet at a Reynolds number of 5000. Excitation by a pulsed co-axial annular jet strengthens the toroidal vortices arising naturally in the shear layer and creates strong secondary vorticity components. Detailed information on the evolution of the vortical structures is presented, providing an insight into their influence and suggesting how the excitation might be optimized. Finally, a Galilean transformation (relating time and distance) is used to reconstruct the complex three-dimensional structure of the excited jet. © 2010 IOP Publishing Ltd.
|Journal||Measurement Science and Technology|
|Publication status||Published - 2010|
- Aerodynamic excitation
- Flow control
- Flow visualization
- Jet flow