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Showing 1 to 20 of 21 for “"Streamwise vorticity"”.
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Experimental studies of mixing flows with streamwise vorticity
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1991.
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Effect of heat release on streamwise vorticity enhanced mixing
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1995.
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Streamwise vorticity enhanced compressible mixing downstream of lobed mixers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
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A computational investigation of the fluid dynamics of a three-dimensional, compressible, mixing layer with strong streamwise vorticity
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1990.
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The impact of midlevel shear vector orientation on the longevity of and streamwise vorticity current formation within simulated supercells with freeslip and semi-slip lower boundaries
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
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Generation of Downstream Vorticity Through the Use of Modified Trailing Edge Configurations
… trailing edge configurations designed to impart streamwise velocity into the flow behind a cascade of GE Rotor B fan blades. These measurements were conducted in the Virginia Tech Low Speed Linear Cascade wind tunnel. The trailing edge configurations tested utilized passive techniques for …
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Use of a Seven-Hole Pressure Probe in Highly Turbulent Flow-Fields
… in the wake of bump 1 reveal a strong streamwise vorticity creating large amounts of high moment fluid entrained close to the wall. In the wake of small bump 3, the amount of high momentum fluid entrained close to the wall is small as well as the streamwise vorticity. The flow in the …
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The Effects of Shrouded Rotor Tip Leakage Flow on the Downstream Stator Aerodynamics in Turbines
… in the Whittle Laboratory. Measured contours of streamwise vorticity at the exit of the downstream stator identified two positive streamwise vortex structures. A computational study revealed that one vortex was caused by a large separation at the leading edge of the stator. It is demonstrated …
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Inlet swirl distortion effects on the generation and propagation of fan rotor shock noise
… of boundary layer ingestion is the creation of streamwise vorticity which is ingested into the inlet, resulting in co- and counter-rotating streamwise vortices in the inlet. The fan sound power level increases by 38 dB due to this distortion, while the vortex whose circulation is in the same …
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Large eddy simulation of shock boundary layer interaction control using micro-vortex generators
… to the micro-vanes. However, the strength of the streamwise vorticity for the micro-ramps decayed faster due to dissipation especially after the shock interaction. In addition, the close spanwise distance between each vortex for the ramp geometry causes the vortex cores to move upwards from the …
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The turbulent structure of the jet in cross-flow
… presented. Probability density functions of the streamwise vorticity field showed that each CVP core is instantaneously made of a number of small vortex tubes rather than a single vortex core. The characteristic ‘kidney’ shape was illustrated in the rms velocity profiles and the Reynolds stress …
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Modifications of Coherent Structures in Fan Blade Wakes for Broadband Noise Reduction
… plane of the wake because of the injection of streamwise vorticity. In almost all cases the serrations reduce the spanwise and streamwise turbulence scales. Serrations do not, however, affect the apparent time scale of quasi-periodic structures in the wake, and this appears to limit the …
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Transport processes in a direct numerical simulation of turbulent channel flow
… the outer flow. This involves the enhancement of streamwise vorticity at the wall, of opposite sign, at a location where a stress-producing eddy lifts from the wall. Another area of exploration is the analysis of how small, dense particles move in a carrier fluid and deposit on a boundary. A …
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Exploring Passive Flow Control Techniques Applied to a Supersonic Multistream Rectangular Nozzle
… the sinusoidal trailing edge induces streamwise vorticity, which enhances mixing between the two streams and breaks up the shed structures seen previously. A wavenumber corresponding to one simulated was tested experimentally via the use of simultaneous nearfield pressure and velocity …
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Investigation of Bio-Inspired Pin Geometries for Heat Transfer Applications
… The seal whisker geometry consists of streamwise and spanwise undulations which reduce the size of the wake and coherent structures shed from the body; a result of an added component of streamwise vorticity along the pin surface. In addition, the vortex shedding frequency becomes less …
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An experimental study of a turbulent wing-body junction and wake flow
… with â (W)/â Y forming the primary component of streamwise vorticity. Near wall measurements show a thin layer of highly concentrated vorticity, underneath and opposite in sign to the primary vortex, which is created by the wall no-slip condition. The development of the flow distortions and …
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Numerical and experimental investigation of VG flow control for a low-boom inlet
… as much as 84%. This effect is achieved by the streamwise vorticity-induced transfer of higher momentum fluid to the centerbody surface downstream of the device centerline. The resulting energized boundary layer is more resistant to separation through the post-shock adverse pressure gradient. …
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Studies in Tip Vortex Formation, Evolution and Control
… the generation of tip vortices from fixed wings. Streamwise vorticity is seen to originate from the cross-flow boundary layer on the wing tip. The separation and subsequent roll-up of this boundary layer forms the trailing vortex system. The initial development of the vortex structure is observed …
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The Influence of Trailing Edge Shape and Kinematics on Bio-inspired Pitching Panels
… despite their increased production of streamwise vorticity, which is not generally considered useful for propulsion. Wake results also reveal that the wakes of these finite aspect ratio propulsors are complex and highly three-dimensional. Wakes are typically comprised of a series of …
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