A Modified Thring–newby Scaling Criterion for Confined, Rapidly Spreading, and Unsteady Jets

Parham, J. J.; Nathan, Graham J.; Hill, Scott; Mullinger, Peter

doi:10.1080/00102200590950539

Cited by 11 publications

(2 citation statements)

References 21 publications

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“…The scaling parameter must be preserved between the real plant and the model, and this is obtained by correcting for the variable densities in combusting systems by distorting the nozzle diameter relative to the duct diameter or the nozzle flow. This ensures that the momentum ratio of the co-flow relative to the jet in the model matches that of the reacting system (Mullinger and Jenkins 2008;Parham et al 2005). In this work, the Craya-Curtet parameter was deemed the most suitable scaling parameter (Larsson et al 2015a).…”

Section: Introductionmentioning

confidence: 99%

Experimental study of confined coaxial jets in a non-axisymmetric co-flow

et al. 2020

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Confined, turbulent, coaxial jets in a non-axisymmetric co-flow are studied using particle image velocimetry (PIV) and planar laser-induced fluorescence (PLIF) simultaneously. Eight different cases are measured. Two momentum flow ratios of the co-flow are used in the experiment to investigate the effect on the coaxial burner jet behavior and mixing characteristics of the coaxial jet flow and the co-flowing, secondary fluid. In addition, four different momentum flow ratios of the coaxial outer to inner jet are investigated. The objective of the study is to get a deeper understanding of how the flow dynamics affects the entrainment and mixing process in a coaxial jet with a non-axisymmetric, surrounding co-flow. The results show that the introduction of a coaxial stream affects the inner jet and decreases the mixing with the surrounding co-flow; the effect is enhanced as the momentum flow ratio of the coaxial jet increases. The distribution of the secondary, co-flowing fluid controls the shape and direction of the coaxial jet, but does not have a significant impact on the mixing process near the centerline. Practical implications of this investigation are related to the possibility to better control a diffusion flame by introducing a coaxial stream. In this context it is concluded that it is possible to affect the jet development and hence the flame length. The conclusion is based on the assumption that the outer, coaxial stream has a low mass flow, not enough to provide complete combustion, and hence the co-flowing, secondary fluid provides the air needed for the combustion process. Graphic abstract

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Section: Introductionmentioning

confidence: 99%

Experimental study of confined coaxial jets in a non-axisymmetric co-flow

et al. 2020

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“…For this reason, detailed measurements undertaken at one condition can be considered to be broadly representative of the flow through that chamber, if undertaken at sufficiently high Re d . Parham et al (2005) used planar laser-induced fluorescence in water to assess the effects of confinement and coflow on the scalar field of the non-reacting jet emerging from this nozzle. These measurements, and those of Newbold (1997), show that true precession is present only in the first few chamber diameters.…”

Section: Introductionmentioning

confidence: 99%

The naturally oscillating flow emerging from a fluidic precessing jet nozzle

2008

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Phase-averaged and directionally triggered digital particle image velocimetry measurements were taken in longitudinal and transverse planes in the near field of the flow emerging from a fluidic precessing jet nozzle. Measurements were performed at nozzle inlet Reynolds and Strouhal numbers of 59 000 and 0.0017, respectively. Results indicate that the jet emerging from the nozzle departs with an azimuthal component in a direction opposite to that of the jet precession. In addition, the structure of the 'flow convergence' region, reported in an earlier study, is better resolved here. At least three unique vortex-pair regions containing smaller vortical 'blobs' are identified for the first time. These include a vortex-pair region originating from the foci on the downstream face of the nozzle centrebody, a vortex-pair region shed from the edge of the centrebody and a vortex-pair region originating from the downstream surface of the nozzle exit lip.

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Correlative analysis of organised structures in turbulent jets

Birzer

2012

Exp Fluids

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A Modified Thring–newby Scaling Criterion for Confined, Rapidly Spreading, and Unsteady Jets

Cited by 11 publications

References 21 publications

Experimental study of confined coaxial jets in a non-axisymmetric co-flow

Experimental study of confined coaxial jets in a non-axisymmetric co-flow

The naturally oscillating flow emerging from a fluidic precessing jet nozzle

Correlative analysis of organised structures in turbulent jets

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