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- W2275996618 abstract "This paper summarizes thirty years of research on ground vortex and upwash flows generated by single and multiple impinging jets in a crossflow with relevance to vertical/Short Take-Off and Landing Aircrafts (V/STOL). Laser Doppler measurements and flow visualization are presented for turbulent circular jets emerging into a low-velocity cross-stream and, then, impinging on a flat surface perpendicular to the geometrical jet-nozzle axis. The experiments were performed for single, twin side-by-side., twin in tandem, and three jets through a crossflow for velocity ratios between the jet exit and the crossflow VR =Vj /Uo of 7.5 to 90. The multiple jets configurations include interject spacings of S=5D and L=6D. The impinging heights were varied from 5 to 20 jet diameters and include mean and turbulent velocity characteristics along the two normal directions parallel to the nozzle axis. The largest velocity ratios are characterized by a large penetration of the impinging jets, giving rise to a ground vortex due to the collision of the radial wall jet and the crossflow that wraps around the impinging point like a scarf. The results help to understand the flow around a V/STOL aircraft operating in ground vicinity with front wind or small forward movement that may result in enhanced negative pressures in the underside of the aircraft causing a pitching moment and suction down force towards the ground." @default.
- W2275996618 created "2016-06-24" @default.
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- W2275996618 date "2014-07-09" @default.
- W2275996618 modified "2023-09-26" @default.
- W2275996618 title "Multiple Jet/Wall/Crossflow Interactions" @default.
- W2275996618 doi "https://doi.org/10.15866/irease.v7i3.2157" @default.
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