Flow structure in a periodic axial vortex array

Werle, M. J.; Presz, Walter M.; Paterson, R. W.

doi:10.2514/6.1987-610

Cited by 62 publications

(37 citation statements)

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“…One possible explanation is that the initial region covers the formation stage of the streamwise vortex cell; only when this is complete do the cross-plane flows effect rapid mixing. This scenario is supported by the flow visualisation study of Werle et al (1987).…”

Section: Discussionmentioning

confidence: 80%

“…This increases the interfacial area over which the two streams mix as well as the lateral scales across which the actual mixing takes place. [The scales vary from the incoming boundary layer thickness 6 in undistorted annular mixers to the height of the convoluted lobe h >> 6, Werle et al (1987)]. Further, due to differing radial deflections around the mixer perimeter strong radial flows are established at the lobe exit which increase shear between the two streams and further promote mixing.…”

Section: Introductionmentioning

confidence: 99%

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Isothermal velocity and turbulence measurements downstream of a model multilobed turbofan mixer

Koutmos

McGuirk

1989

Experiments in Fluids

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An isothermal experimental investigation of the three dimensional flow field downstream of a model multilobed turbofan forced mixer is presented. LDA measurements of the three mean velocities and corresponding turbulence intensities were obtained in the downstream duct where the turbine (primary) and fan (secondary) streams emerging from the lobes mix together. The flow development in the near field was quantified by measuring the crossplane velocities. These were found to consist of large radial flows, of order 15% of the mean axial velocities at the lobe inlet, with changing sign depending on location. The cross-plane flow is consistent with a large scale axial vortex pair (per lobe) which persists throughout the downstream duct and enhances mixing in this region. Turbulence generation and anisotropy of the turbulence structure were evident mainly in the shear layers formed as the fan and turbine streams emanated from the lobe trailing edge. Spatial uniformity in the mean and turbulent fields was measured as little as five heights downstream of the mixer exit, indicating the rapid mixing achievable in these systems.

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Section: Discussionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Isothermal velocity and turbulence measurements downstream of a model multilobed turbofan mixer

Koutmos

McGuirk

1989

Experiments in Fluids

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“…Based on flow visualization tests in a water tunnel, Werle, Paterson and Presz [5] suggested that the flow structure of the wake region behind the lobed mixer follows a three-step process by which the streamwise vortex cells form, intensify, and then break down. Most intense mixing seemed to occur in the third region.…”

Section: Introductionmentioning

confidence: 99%

Computational studies of lobed forced mixer flows

1998

J. of Therm. Sci.

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Full Navier Stokes Analyses have been conducted for the flows behind the trailing edge of a lobed forced mixer. The governing equations are derived from the time-dependent compressible Navier-Stokes equations and discretized in the finite-difference form. A simple two-layer eddy viscosity model has also been used to account for the turbulence. Computed results are compared with some of the velocity measurements using a laser-Doppler anemometer (Yu and Yip (1997)). In general, good agreement can be obtained in the streamwise mean velocity distribution but the decay of the streamwise circulation is underpredicted. Some suggestions to the discrepancy are proposed.

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“…Conventional ejectors need mixing duct lengths greater than ten to generate near uniform flow. For this reason, the use of forced mixer lobes in ejectors has been researched quite extensively over the last fifteen years 1359 [5][6][7][8][9][10][11][12]. Werle et al [5] present a comparison of normal shear mixing, and mixing provided by a forced mixer lobe.…”

Section: Introductionmentioning

confidence: 99%

Investigations of flows in a new infrared suppressor

Suo-fang

2006

Applied Thermal Engineering

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Flow structure in a periodic axial vortex array

Cited by 62 publications

References 0 publications

Isothermal velocity and turbulence measurements downstream of a model multilobed turbofan mixer

Isothermal velocity and turbulence measurements downstream of a model multilobed turbofan mixer

Computational studies of lobed forced mixer flows

Investigations of flows in a new infrared suppressor

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