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Showing 1 to 11 of 11 for “"separated shear layer"”.
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Conditionally Analyzed Mean Velocity and Turbulence Measurements in a Plume-Induced Boundary Layer Separated Flowfield
… (which both peak near reattachment), the primary shear stress, and the normal stress anisotropy. The shock-separated shear layer consists of only a single layer with a large initial growth rate followed by a much smaller growth rate, instead of the two layers found in rapidly expanded shear …
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Measurements and Visualizations of a Three-Dimensional Compressible Base Flow
… discontinuity, a base-edge expansion fan, a separated shear layer, an asymmetric recirculation region, and a turbulent wake. A strong secondary circumferential flow, which develops along the afterbody due to pressure gradients on its surface, results in the entertainment of fluid into the …
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Flow Visualization Study of Wake-Stabilized Diffusion Flames in a Crossflow: Effects of Crossflow Turbulence
… the development of vortical structures in the separated shear layer, which are closely associated with increases in combustion inefficiency. The fuel stripping mechanism was proposed to be responsible for inefficient combustion; a few bits of unburnt fuels are observed to be drawn through …
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Iced Airfoil Separation Bubble Measurements by Particle Image Velocimetry
… revealed accelerated transition of the separated shear layer emanating from a three-dimensional ice simulation and therefore enhanced pressure recovery and reduced mean separation bubble length, each relative to the flowfield of a representative two-dimensional ice simulation. These …
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Three-dimensional turbulence mechanisms in a supersonic separated/reattaching longitudinal cylinder wake
… in the immediate vicinity of reattachment of the separated shear layer, as these mechanisms are the main drivers of critical flow properties, such as the low pressure in the separated region. This work was experiment-based, utilizing non-intrusive optical measurement techniques, including …
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Characterization and Analysis of Supersonic Flow Through De Laval Nozzles at Varied Design Conditions
… capability. The shock interactions with the separated shear layer were evident, and downstream propagation of wave phenomena in the jet flow were observed. The design condition was simulated numerically, and while supersonic flow was present throughout the nozzle, some shocks were present in …
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Numerical Simulation of Vortex Generating Jets in Zero and Adverse Pressure Gradients
… jet induced strong spanwise vortices in the separated shear layer which appear to weaken the separation zone and allow the bulk jet fluid to flush the remaining low-momentum fluid out of the domain. It is reasonable to assume that reduced blowing ratios and duty cycles would produce similar …
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Unsteady modes in the flowfield about an airfoil with a leading-edge horn-ice shape
… model was also tested with a set of boundary-layer trips, a two-dimensional extrusion of a horn-ice shape casting, and an array of simulated icing configurations created using simple geometries. Time-averaged and unsteady static pressure measurements were acquired about the airfoil surface, …
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An Experimental Spatio-Temporal Analysis of Separated Flows Over Bluff Bodies Using Quantitative Flow Visualization
… are known to exist due to instabilities of plane shear layers. Similar streamwise vortices, also known as braid vortices have been observed in the past in the wake of circular cylinders with symmetric boundary conditions. The present spatio-temporal analysis demonstrated coexistence of two types …
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Optimizing openings through tall buildings to mitigate their crosswind response
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-05-01
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Numerical lnvestigation of Disturbance Environments in Low Pressure Turbines
… These streaks impart spanwise waviness to the separated shear layer and cause early destabilisation. The blade oscillation has an effect in reducing the separated region and hence, the profile loss, which is further accentuated in the presence of free-stream turbulence. A blade fluctuating at …