The Role of the Large-Scale Structures in Turbulent Wall Jets » książka
The Role of the Large-Scale Structures in Turbulent Wall Jets
ISBN-13: 9783639175707 / Angielski / Miękka / 2009 / 172 str.
The development of the large-scale turbulent structures is experimentally investigated in both impinging jets and three-dimensional wall jets. An azimuthal decomposition of the fluctuating wall pressure in the impinging jet revealed the presence of large-scale ring structures; however, these ring structures did not appear to impact the wall concentrically. The development of three-dimensional wall jets exiting rectangular channels with aspect-ratios from 1 to 8 was investigated using the turbulent velocity and measurements of the fluctuating wall pressure. The development was found to be delayed by increasing the channel aspect-ratio, but the length-scales in the different jets could be collapsed by scaling the streamwise coordinate by the square root of the channel cross-sectional area and normalizing by the size of the channel. Pressure-velocity correlations indicate that the large-scale structures in these flows are strongly asymmetric.
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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