Numerical Investigation of a Jet in Ground Effect with a Crossflow

Dalsem, W. R. Van; Panaras, Argyris G.; Steger, J. L.

doi:10.4271/872344

Cited by 16 publications

(3 citation statements)

References 13 publications

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“…Stewart focused on the effects of a moving jet vs a stationary jet in a wind tunnel, whereas Paulson and Kemmerly studied the effects of sink rate on ground vortex formation. Computational efforts include Van Dalsem and Steger, 31 Van Dalsem et al, 32 and Smith et al 33 Navier-Stokes CFD simulations have been obtained for circular and elliptical, laminar and turbulent jets in a crossflow impinging on a ground plane, with generally good agreement with experimentally observed ground vortex location. The recent work of Smith et al presents a simulation of the flow around the complete Harrier AV-8B configuration in ground effect.…”

Section: Nomenclaturementioning

confidence: 89%

Jet ground vortex formation by annular jets

Kuhlman

Cavage

1994

Journal of Aircraft

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An experimental study has been conducted of the impingement of a single circular jet on a ground plane in a crossflow. This geometry is a simplified model of the interaction of propulsive jet exhaust from a V/STOL aircraft with the ground in forward flight. Jets have been oriented normal to the crossflow and ground plane. Jet size, crossflow-to-jet velocity ratio, ground plane-to-jet board spacing, jet exit turbulence level, and mean velocity profile shape have all been varied to determine their effects on the size of the ground vortex interaction region which forms on the ground plane, using smoke injection into the jet. Variation of observed ground vortex size with crossflow-to-jet velocity ratio was consistent with previous studies. Observed effects of jet size and ground plane-to-jet board spacing were relatively small. Jet exit turbulence level effects were also small. However, an annular jet with a low velocity central core was found to have a significantly smaller ground vortex than an equivalent uniform jet at the same values of crossflow-to-jet velocity ratio and jet exit-to-ground plane spacing. This may suggest a means of altering ground vortex behavior somewhat, and points out the importance of proper simulation of jet exit velocity conditions. Laser velocimeter data indicated unsteady turbulence levels in the ground vortex as high as 80%.

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Section: Nomenclaturementioning

confidence: 89%

Jet ground vortex formation by annular jets

Kuhlman

Cavage

1994

Journal of Aircraft

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“…Examples already presented include single and multiple jets in a crossflow. [92][93][94] Additional examples include delta wings with jet nozzles directed towards the ground and a RANS solution 95 for a simplified Harrier (wing, fuselage, inlets, and nozzles). All of these investigators cite two main problems in computing these flows: 1) the need for more accurate solution methods and 2) the need for a faster solution process.…”

Section: Analysis Of a Complete Aircraft The Harriermentioning

confidence: 99%

Jet Induced Effects

Curtis¹,

Kuhn²,

Margason³

2007

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ForewordT HIS TEXT on the most crucial aspect of V/STOL aircraft is co-authored by three experts in this field whose combined experience stretches many decades. The authors have produced a timely volume in view of the development of the F-35B STOVL version of the Joint Strike Fighter and various proposals for V/STOL unmanned aircraft. The volume draws on the authors' vast experience, covering the salient features that affect the flight of V/STOL aircraft during hover and transition to horizontal flight. The authors have identified important technological challenges and have outlined methods that were applied to address them. The text is written in a clear style and it provides methods for estimating the complex aircraft/flowfield interactions through empirical correlations. Thus, the methodology applied is easy to understand and allows the reader to quickly grasp the material. Moreover, the authors share their personal, first-hand insights which are of tremendous value in understanding the complex flows that arise in the V/STOL flight regime.

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“…New boundary conditions can be introduced in the computational region using the FSA when choosing the forcing region not to be an area but to be a line (in the threedimensional case, not a volume but a surface). For instance, Van Dalsem and Steger solved a jet impingement problem [13].…”

Section: (4)mentioning

confidence: 99%