Turbulent free jet flows issuing from sharp-edged rectangular slots: The influence of slot aspect ratio

Quinn, W. R.

doi:10.1016/0894-1777(92)90007-r

Cited by 125 publications

(114 citation statements)

References 21 publications

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“…Figure 3 shows the normalized half-widths Y 1/2 / D e and Z 1/2 / D e obtained by Quinn 2 for AR= 10 and 20 and by Trentacoste and Sforza 10 for AR= 40. Here, the halfwidths Y 1/2 and Z 1/2 are, respectively, lateral distances from the jet axis to the y and z locations at which the axial mean velocity is 0.5U c .…”

Section: Characterization Of Turbulent Jets From High-aspect-ratio Rementioning

confidence: 99%

Characterization of turbulent jets from high-aspect-ratio rectangular nozzles

Deo

Nathan

2005

Physics of Fluids

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Turbulent free jets issuing from rectangular slots with various high aspect ratios (15–120) are characterized. The centerline mean and rms velocities are measured using hot-wire anemometry over a downstream distance of up to 160 slot heights at a slot-height-based Reynolds number of 10 000. Experimental results suggest that a rectangular jet with sufficiently high aspect ratio (>15) may be distinguished between three flow zones: an initial quasi-plane-jet zone, a transition zone, and a final quasi-axisymmetric-jet zone. In the quasi-plane-jet zone, the turbulent velocity field is statistically similar, but not identical, to those of a plane jet.

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Section: Characterization Of Turbulent Jets From High-aspect-ratio Rementioning

confidence: 99%

Characterization of turbulent jets from high-aspect-ratio rectangular nozzles

Deo

Nathan

2005

Physics of Fluids

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“…All these descriptions and conclusions on the fluid mechanics of near-field rectangular jet development have been substantiated in a study by Lozanova and Stankov 10 , who conducted X-probe hot-wire measurements for nozzles with AR between 3 and 10, and provided detailed 2D mapping of mean vorticity as well as turbulent normal and shear stresses in the near-field for AR=3. The effect of nozzle AR on jet development was further investigated by Quinn 11,12 and Mi et al 13 ; these results showed that near-field turbulence levels and mixing were increased as aspect ratio (AR) increased, up to AR~20.…”

Section: Introductionmentioning

confidence: 99%

Underexpanded Jet Development from a Rectangular Nozzle with Aft-Deck

Behrouzi

McGuirk

2015

AIAA Journal

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“…It is also clear that the near field growth rate of the jets strongly depends on the shape of the exit nozzle and inlet conditions. A 5:1 AR slotted jet by Quinn 31 is 50% lower in the first 3.5 jet diameters as compared to a 2:1 unexcited elliptic jet. Also, an excited 4:1 elliptic jet shows 3.5 times increase in jet spread as compared to unexcited jet at 3.5 jet diameters.…”

Section: -9mentioning

confidence: 99%

“…The radial distance from the centerline was normalized by the jet half-width. The present data are compared to those of a fully developed planar jet at a streamwise location of 65 jet diameters, 34 a subsonic circular pulsed jet at 1 jet diameter, 30 a slotted jet of aspect ratio 5:2 jet diameters, 31 and an excited elliptic jet of aspect ratio 4:1.…”

Section: -9mentioning

confidence: 99%

Flow-structure interaction effects on a jet emanating from a flexible nozzle

et al. 2008

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In recent years, a wide variety of applications have been found for the use of pulsed jets in the area of flow control. The goal of the current study was to identify the flow field and mixing characteristics associated with an incompressible elongated jet emitted from a flexible nozzle. The shape of the nozzle was that of a high aspect ratio jet deforming from a fully opened to a completely closed configuration. The jet was characterized by a pulsatile flow that was self-excited by the motion of the flexible tube. The frequency of excitation was found to be between 150 and 175 Hz and the Strouhal number ͑nondimensional frequency͒ varied from 0.17 to 0.45. The jet flow was dominated by vortices that were shed from the nozzle with an axis parallel to the major axis. The vortices in the near field were quasi-two-dimensional so that measurements performed at the center plane represented the dynamics of the entire vortex. The nozzle excited two different modes depending on the tension applied to the flexible nozzle and the volumetric flow through it. The first was a flapping mode, which was associated with alternate shedding of vortices. This caused strong steering of the jet to one side or the other. The second mode was a symmetric mode that was associated with the formation of counter-rotating vortex pairs. Turbulence and jet spread in the measured planes were much larger in the first mode than the second one.

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Turbulent free jet flows issuing from sharp-edged rectangular slots: The influence of slot aspect ratio

Cited by 125 publications

References 21 publications

Characterization of turbulent jets from high-aspect-ratio rectangular nozzles

Characterization of turbulent jets from high-aspect-ratio rectangular nozzles

Underexpanded Jet Development from a Rectangular Nozzle with Aft-Deck

Flow-structure interaction effects on a jet emanating from a flexible nozzle

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