An experimental investigation of ground vortex formation during reverse engine operation

Motycka, D.; Walter, William

doi:10.2514/6.1975-1322

Cited by 8 publications

(4 citation statements)

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“…These have included small-scale experiments (e.g. Klein 1957 ;Glenny 1970;Motycka, Walter & Muller 1973;Motycka & Walter 1975;Bissinger & Braun 1974), full-scale tests with engines (Rodert & Garrett 1955 ;Motycka 1976), panelmethod calculations of the velocity field associated with a potential vortex and inlet combination (Colehour & Farquhar 1971), and two-dimensional free-streamline potential-flow models of an inlet near a ground plane (Newman & Atassi 1980). A discussion of these various studies is given by Viguier (1980), but we can summarize the main conclusions presented in the existing literature as follows.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of inlet-vortex formation

et al. 1982

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An experimental and theoretical study is presented of the inlet-vortex (or ground-vortex) phenomenon. The experiments were carried out in a water tunnel using hydrogen-bubble flow visualization. The theoretical study is based on a secondary-flow approach in which vortex filaments in a (weak) shear flow are viewed as convected (and deformed) by a three-dimensional irrotational primary flow; the latter being calculated numerically using a three-dimensional panel method. Two basic mechanisms of inlet-vortex generation are identified. The first of these, which has been alluded to qualitatively by other investigators, is the amplification of ambient (i.e. far-upstream) vorticity as the vortex lines are stretched and drawn into the inlet. Quantitative calculations have been carried out to illustrate the central features connected with this amplification. I n contrast with what has been supposed, however, there is another mechanism of inlet-vortex formation, which does not appear to have been recognized previously and which does not require the presence of ambient vorticity. It is thus shown that an inlet vortex can arise in an (upstream) irrotational flow, for an inlet in cross wind. In this situation, the vortex is accompanied by a variation in circulation along the length of the inlet. The ratio of inlet velocity to upstream veIocity is an important parameter for both mechanisms.

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Section: Introductionmentioning

confidence: 99%

Mechanisms of inlet-vortex formation

et al. 1982

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“…A vortex can be generated without ambient wind and with a low ratio h/D i (typically less than one). Due to the ground proximity, high levels of suction beneath the engine inlet leads into a strong flow underneath the inlet upstream towards the intake lip 7 . In these conditions, it is possible to visualize at the engine intake and at the ground two upward spiraling vortices.…”

Section: VIIImentioning

confidence: 99%

A Comparison of Different Gas Turbine Engines Ground Vortex Flows

Barata¹,

Manquinho²,

Silva³

2010

46th AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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“…Bissenger and Braun performed one of the first tailwind studies but the work was limited to small scale water tunnel visualizations [19]. Motycka et al [14,20,21] conducted experimental studies with a 1/12 th scale intake model. Although very little quantitative data was obtained, they suggested that ground vortices which formed under tailwind or reverse thrust conditions were stronger than those formed under quiescent, headwind and forward quarter yaw conditions.…”

Section: Introductionmentioning

confidence: 99%

Intake ground vortex characteristics

Mishra

MacManus

Murphy

2011

Proceedings of the Institution of Mechanical Engineers, Part G:

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The development of ground vortices when an intake operates in close proximity to the ground has been studied computationally for several configurations including front and rear quarter approaching flows as well as tailwind arrangements. The investigations have been conducted at model scale using a generic intake geometry. Reynolds Averaged Navier–Stokes calculations have been used and an initial validation of the computational model has been carried out against experimental data. The computational method has subsequently been applied to configurations that are difficult to test experimentally by including tailwind and rear quarter flows. The results, along with those from a previous compatible study of headwind and pure cross-wind configurations, have been used to assess the ground vortex behaviour under a broad range of velocity ratios and approaching wind angles. The characteristics provide insights on the influence of the size and strength of ground vortices on the overall quality of the flow ingested by the intake.

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An experimental investigation of ground vortex formation during reverse engine operation

Cited by 8 publications

References 0 publications

Mechanisms of inlet-vortex formation

Mechanisms of inlet-vortex formation

A Comparison of Different Gas Turbine Engines Ground Vortex Flows

Intake ground vortex characteristics

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