Vortical and turbulent structure of a lobed mixer free shear layer

McCormick, D. C.; Bennett, John D.C.

doi:10.2514/3.12183

Cited by 121 publications

(45 citation statements)

References 14 publications

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“…x/D = 3 where they are beginning to break down. Assuming a similar process is happening for N l, the vortex break down is probably initiated by the pinch off effect of McCormick [1992], but the flow visualizations of this study cannot confirm this because the visualization methods are different. McCormick seeded the boundary layer in his experiments whereas the whole inner flow was seeded for the present study, and thus detailed flow structures near the interface are not highlighted.…”

mentioning

confidence: 71%

“…A very detailed and systematic study by McCormick [1992] revealed several more details of the flow patterns downstream of a lobed mixer. Extensive flow visualizations for laminar and turbulent air flow, and three-dimensional hot wire velocity measurements, showed that the Kelvin-Helmholtz vortices, which are normal to the flow direction, play a major role in the mixing process.…”

mentioning

confidence: 99%

“…Another interesting observation by McCormick is that the scale of the normal vortices shed from the lobed mixer is about 1/4 that shed for a planar baseline case. Thus, it seems that the lobed mixer introduces smaller scales 29 into a flow sooner, which could enhance molecular mixing [McCormick andBennett, 1993, 1994]. studied axisymmetric lobed mixers used in ejector applications.…”

mentioning

confidence: 99%

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Mixing processes in a coaxial geometry with a central lobed mixer-nozzle

Belovich

Samimy

1996

34th Aerospace Sciences Meeting and Exhibit

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confidence: 71%

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confidence: 99%

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confidence: 99%

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Mixing processes in a coaxial geometry with a central lobed mixer-nozzle

Belovich

Samimy

1996

34th Aerospace Sciences Meeting and Exhibit

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“…McCormick and colleagues 7,8 performed extensive flow visualizations and quantitative hot-film anemometry measurements on a forced mixer. Through smoke flow visualizations, the presumed existence of horseshoe-shaped vortices found in the lobe troughs at the mixer trailing edge were verified.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of flow behavior for scalloped and lobed mixers

Merati

Cooper

2016

Advances in Mechanical Engineering

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Particle image velocimetry and planar laser-induced fluorescence techniques are used to measure the flow of scalloped, lobed, and splitter mixers. Special attention is given to the understanding of the details of the flow for the scalloped mixers and the role of the notches in enhancing the mixing process. The comparisons between the three mixers are explained by providing detailed measurements on several axial and cross-streamwise planes. Scalloped-lobed mixers enhance the mixing of the two streams by generating an additional pair of small-scale streamwise vortices not observed in the lobed mixer shear layer. Under the same test condition, the impingement of the inner flow on the mixing duct occurs further downstream than the lobed mixer. For the scalloped mixer, the decay of the cross-streamwise velocity starts at its exit plane, while for the lobed mixer, there is an initial magnitude rise before the streamwise decay.

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“…Investigations concluded that the increase in the interfacial area between the primary and secondary streams (Elliott et al 1992) -at the same time forming inviscid streamwise vortices at the wake (Povinelli and Anderson 1984) -and the streamwise vortices interacting with the normal vortices ring which are formed at the interface of the streams for the gradient of the axial velocity (McCormick and Bennett 1994), are the dominating factors for high mixing effectiveness. The lobed nozzles have been widely used in the engineering applications (Presz et al 1994;Acheson et al 2011).…”

Section: Introductionmentioning

confidence: 99%

The Effects of Spoilers on Jet Mixing of Lobed Nozzles

Liu

Huang

Sheng

et al. 2016

J.Aerosp. Technol. Manag.

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In this study, spoilers were installed on the lobed nozzle principal model. Keeping axial position unchanged, the different widths of spoilers were mounted along the circumferential direction of a mixer tube. The effects of spoilers on the jet mixing of lobed nozzle were investigated by numerical method, and the results showed that, before or after the installation, the flow ratio did not change significantly. The value of thermal mixing efficiency and total pressure recovery coefficient had a corresponding improvement. The spoilers increased the borderline area of the primary and secondary streams, thus the mixing was accelerated. Spoilers can avoid high-temperature primary stream impinging the wall of the tube, and the temperature of mixing tube wall decreased significantly.

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Vortical and turbulent structure of a lobed mixer free shear layer

Cited by 121 publications

References 14 publications

Mixing processes in a coaxial geometry with a central lobed mixer-nozzle

Mixing processes in a coaxial geometry with a central lobed mixer-nozzle

Experimental investigation of flow behavior for scalloped and lobed mixers

The Effects of Spoilers on Jet Mixing of Lobed Nozzles

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