Vorticity dynamics in three-dimensional pulsating co-flowing jet diffusion flames

Vorticity Dynamics in Three-dimensional Pulsating Co-flowing Jet Diffusion Flames

The vorticity dynamics in the near field of laminar (Re = 10) co-flowing jets subjected to the single or combined effeets of axial and azimuthal forcing is analyzed. It is shown that the interaction of the three-dimensional vortex structure resulting from the growth of the two and three-dimensional instabilities may result in large changes in the entrainment and mixing characteristics of the je...

Three-dimensional Vorticity Dynamics in a Cooowing Turbulent Jet Subjected to Axial and Azimuthal Perturbations

The eeect of axial and azimuthal forcing on the spreading and mixing characteristics in the near eld (x=D < 13) of a cooowing, turbulent (Re > 2000) water jet is studied by means of planar, laser induced uorescence (PLIF) visualizations. Measurements of both the initial spreading rate of the jet and the decay of the concentration along the centerline of the jet show a marked increase in the mix...

Three-dimensional flow visualization and vorticity dynamics in revolving wings

We investigated the three-dimensional vorticity dynamics of the flows generated by revolving wings using a volumetric 3-component velocimetry system. The threedimensional velocity and vorticity fields were represented with respect to the base axes of rotating Cartesian reference frames, and the second invariant of the velocity gradient was evaluated and used as a criterion to identify two core ...

Nonlinear Axisymmetric And Three-Dimensional Vorticity Dynamics In . . .

Ignition in 40 kW co-axial turbulent diffusion oxy-coal jet flames

This paper is directed towards understanding how composition of the coal transport medium (primary CO2 and O2) affects the observed ignition stand-off distance in 40 kW co-axial turbulent diffusion, oxy-coal flames, supported in a specially designed combustion test rig, rated at 100 kW. First, a methodology to define and quantify the observed ignition stand-off distance in laboratory combustor ...