Measurements in the near flow field of an isosceles triangular turbulent free jet

Quinn, W. R.

doi:10.1007/s00348-005-0988-2

Cited by 68 publications

(58 citation statements)

References 7 publications

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“…On the other hand, the decay of k has the highest value for triangular jet and the lowest value for the round jet. The fact that the turbulent kinetic energy levels are increasing with downstream distance is consistent with the results provided by Quinn [9].…”

Section: Resultssupporting

confidence: 81%

Flow structure and turbulence in near fields of circular and noncircular jets

Öçer

Taşar

Uzol

et al. 2012

Progress in Flight Physics

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Experimental investigation of the turbulent §ow ¦eld of jets emanating from circular and curved-edged noncircular nozzles is conducted using hotwire anemometry. Distributions of the mean velocity vector are obtained by traversing a triple-sensor hot-wire probe at varying streamwise locations downstream of the jet exit plane in a low-speed free-jet facility. Measurements are obtained for a baseline circular nozzle (round jet) and for equilateral triangular and square nozzles. The data are used to compare the structure of the §ow ¦eld within these jets such as their mean velocity, turbulent kinetic energy, and entrainment levels. Axis rotation phenomenon is also investigated for noncircular nozzles, and it was not observed up to a streamwise location of 10d (d is the nozzle equivalent diameter, equals to 40 mm) for noncircular nozzles.

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Section: Resultssupporting

confidence: 81%

Flow structure and turbulence in near fields of circular and noncircular jets

Öçer

Taşar

Uzol

et al. 2012

Progress in Flight Physics

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“…However, there are still discrepancies between the results reported in different published studies. For example, results of fluid entrainment rate indicated by the centerline velocity decay of isosceles and equilateral triangular nozzles as reported by Mi et al [14] differ from those of Quinn [19]. While Mi et al [14], who used nine different nozzle geometries, found that their isosceles triangular jet induced a better entrainment rate than its counterpart equilateral triangular jet; Quinn [19] reported the opposite scenario.…”

mentioning

confidence: 50%

“…For example, it was reported that asymmetric nozzles (especially the triangular, rectangular, and elliptical nozzles) promote higher entrainment and jet spreading compared to their circular (axisymmetric) counterparts (e.g., [10][11][12][13][14][15][16][17][18][19]). Among the studies on asymmetric nozzles (e.g., [10][11][12][13][14][15][16][17][18][19]), it is reported, for instance, that the triangular nozzle's jet has a higher entrainment rate than the rectangular jet. However, there are still discrepancies between the results reported in different published studies.…”

mentioning

confidence: 99%

Effect of Sudden Expansion on Entrainment and Spreading Rates of a Jet Issuing from Asymmetric Nozzles

Iyogun

Birouk

2008

Flow Turbulence Combust

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Turbulent free jets issuing from five different nozzle geometries; smooth pipe, contracted circular, rectangular, triangular, and square, are experimentally investigated by using TSI 2-D laser Doppler velocimetry (LDV) to assess the effect of nozzle geometry and quarl (i.e. a cylindrical sudden expansion) on jet entrainment and spreading. The centerline mean velocity decay and the jet half-velocity width, which are indicators of jet entrainment and spreading rates, are determined for each nozzle's flow configuration, i.e. with and without sudden expansion. Furthermore, turbulence quantities, such as the flow mean velocities and their mean fluctuating components, as well as Reynolds shear stresses, are all measured along the centerline plane of the jet to facilitate understanding the extent of the effect of nozzle's geometry (i.e. nozzle's orifice shape and sudden expansion) on jet's entrainment and spreading. The main results show that the jet flow with the presence of sudden expansion exhibits higher rates of entrainment and spreading than without. In addition, these results reveal that sudden expansion exercises a greater effect on the asymmetric jet characteristics, especially for the triangular and rectangular nozzles compared to their axisymmetric counterparts (i.e. circular contracted nozzle).

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“…According to the Figure, 3-lobed nozzle entrains greater amount of mass from surroundings comparing with circular jet. Results are compared with Nastase & Meslem [11]'s 6-lobed jet and Quinn [7]'s triangular jet experiments.…”

Section: Entrainment Ratesmentioning

confidence: 99%

“…They found that the location and number of switchovers are strongly dependent on the initial conditions. Experimental results of Quinn, concentrated on sharp edged elliptical [6] and triangular [7] nozzles, show that the jet attains axisymmetric shape after one or two switches of major and minor axis. These Lobed nozzles are widely used in turbofan engines to reduce jet noise, and in combustion chambers to improve combustion efficiency.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on the near flow field characteristics of non-circular jets

Yukselenturk

Erdem

2013

EPJ Web of Conferences

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Abstract. Subsonic turbulent free jet, issuing from a lobed contoured nozzle in to quiescent air is investigated experimentally. Results are compared with a circular jet from a nozzle of the same exit area and same contraction profile. Mean flow characteristics, turbulence intensities and Reynolds shear stresses in the near field region are investigated by using Hot-wire Anemometry. An overall decrease in turbulence intensities and enhanced flow entrainment in the near field of lobed nozzle are observed.

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Measurements in the near flow field of an isosceles triangular turbulent free jet

Cited by 68 publications

References 7 publications

Flow structure and turbulence in near fields of circular and noncircular jets

Flow structure and turbulence in near fields of circular and noncircular jets

Effect of Sudden Expansion on Entrainment and Spreading Rates of a Jet Issuing from Asymmetric Nozzles

An experimental study on the near flow field characteristics of non-circular jets

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