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The Role of the Large-Scale Structures in Turbulent Wall Jets

The Role of the Large-Scale Structures in Turbulent Wall Jets

Joseph Hall

84,00 €
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Editorial:
KS OmniScriptum Publishing
Año de edición:
2009
Materia
Tecnología aeroespacial y aeronáutica
ISBN:
9783639175707
84,00 €
IVA incluido
Disponible

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Sobre IBD

The development of the large-scale turbulentstructures is experimentally investigated in bothimpinging jets and three-dimensional wall jets. Anazimuthal decomposition of the fluctuating wallpressure in the impinging jet revealed the presenceof large-scale ring structures; however, these ringstructures did not appear to impact the wallconcentrically. Thedevelopmentof three-dimensional wall jets exiting rectangularchannels with aspect-ratios from 1 to 8 wasinvestigated using the turbulent velocity andmeasurements of the fluctuating wall pressure. Thedevelopment was found to be delayed by increasing thechannel aspect-ratio, but the length-scales in thedifferent jets could be collapsed by scaling thestreamwise coordinate by the square root of thechannel cross-sectional area and normalizing by thesize of the channel. Pressure-velocity correlationsindicate that the large-scale structures in theseflows are strongly asymmetric.

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