Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 34 for “"Boundary Layer Transition"”.
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Roughness-induced boundary layer transition
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
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Boundary layer transition in simulated turbine blade flow
… investigation of the development of the boundary layer in a simulated turbine blade flow is described.<br/><br/>A velocity distribution typical of a "squared-off" turbine blade was reproduced in an open return wind tunnel. Measurements were made in the boundary layer formed on a flat, …
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The effect of cooling on boundary layer transition in a gas
Thesis (Sc.D.) Massachusetts Institute of Technology. Dept. of Mechanical Engineering, 1952.
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The effect of heating on boundary layer transition for liquid flow in a tube
Thesis (Sc.D.) Massachusetts Institute of Technology. Dept. of Mechanical Engineering, 1953.
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Experimental investigation and theoretical considerations of boundary layer transition of the hemisphere at low wall-to-stagnation temperature ratios
… whether or not instability of the laminar boundary layer on blunt convex bodies exists when the wall-to-stagnation temperature is lowered. It was found that instability existed and theoretical considerations are given to the transition being associated with the formation of ice on the model …
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Computational study of hub corner stall in an axial compressor rotor
… Elliptic Flow Program. A one equation, q-L, transitional turbulence model was used with MEFP for closure of the transport equations. The calculation was used to study the physics and flow mechanisms affecting hub corner stall. Preprocessing and post processing programs were written to aid …
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AEROSOL EFFECTS IN HIGH SUPERSONIC FLOWS
… species and sizes that are transported to every layer of the atmosphere. At supersonic speeds, encounters with particulates have been shown to lead to detrimental effects, such as material erosion and boundary layer transition. Previous attempts to study this problem in wind tunnels have focused …
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High Fidelity Studies in Closed-Loop Control of Unsteady Aerodynamics
… control strategy based on POD-ROM focusing on boundary-layer transitional flow in high-fidelity computational studies involving FDL3DI ILES code. Controlling the boundary-layer transition from laminar to turbulent allows the laminar boundary-layer to be lengthened, decreasing skin-friction drag …
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Surface Curvature and Roughness Effects on Görtler Vortex Development in Hypersonic Flow
… curvature affect the downstream development and transition characteristics of the hypersonic boundary layer formed over concave models. It also serves to extend previous work on the effect of shaped surface roughness on the Görtler instability to the hypersonic regime. The included results …
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An experimental study on the effects of blade row interactions on aerodynamic loss mechanisms in a multistage compressor
… on embedded stator total pressure loss and boundary layer transition in the Purdue 3-stage axial compressor. The inlet guide vane, Stator 1, and Stator 2 all have 44 vanes which enable vane clocking of the embedded stage, while the rotors have different blade counts producing amplitude …
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Development and application of transition detection using infrared thermography for characterization of fan blade waviness effects
… a new approach to infrared measurement of boundary layer transition and its implementation in a natural transition experiment on flat and wavy surfaces. The approach relies on computing the convective heat transfer coefficient field on the test surface and inferring transition region from …
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Integral Boundary Layer Methods in Python
… presents a modern approach to two Integral Boundary Layer methods implemented in the Python programming language. This work is based on two 2D boundary layer methods: Thwaites' method for laminar boundary layer flows and Head's method for turbulent boundary layer flows. Several novel …
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A Computational Fluid Dynamics (CFD) Analysis of the Aerodynamic Effects of the Seams on a Two-Dimensional Representation of a Soccer Ball
… Fluid Dynamics (CFD). By applying a transitional solver to the narrowed scope of a two-dimensional flow domain, with a single seam in cross-flow, the effects of the seam on the boundary layer and overall transient flow structure can be more accurately modeled. Data analysis suggests …
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The Effects of Vortex Generator Jet Frequency, Duty Cycle, and Phase on Separation Bubble Dynamics
… about the influence of VGJs on a separated boundary layer. The data were collected on the suction surface of the Pack B blade profile, which has a non-reattaching separation bubble beginning at 68% axial chord. Two VGJ pulse histories were created with different frequencies, jet durations, …
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Compressor leading edges
… only when they become large enough to initiate boundary layer transition at the leading edge through a separation bubble; this process increases profile loss by about 30%. A criterion is presented, based on the spike diffusion, which can be used to determine whether leading edge transition will …
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An interferometric study of unsteady passing shock flow in a turbine cascade
… In addition to the interferometric study, a boundary layer transition study was also undertaken. Magnified boundary layer spark shadowgraphs were taken on both the pressure and suction surfaces of the turbine blade. Flow conditions including low (<1.0%) and high (5%) free stream turbulence …
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Performance of a Showerhead and Shaped Hole Film Cooled Vane at High Freestream Turbulence and Transonic Conditions
… to be less sensitive to changing blowing ratio. Boundary layer transition location was shown to be within a consistent region on the suction side regardless of blowing ratio and exit Mach number.
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Measurements and Predictions of Heat Transfer for a First Vane Design
… to the effects of increased turbulence. The boundary layer transition location moved further upstream with increasing turbulence. Trip wires were used to model the effect of film-cooling holes on the boundary layer development. The heat transfer increased locally at the trip and either …
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DEVELOPMENT OF KRYPTON PLANAR LASER INDUCED FLUORESCENCE METHODS FOR THE MEASUREMENT OF HYPERSONIC FLOW CONDITIONS
… geometries in sup- port of the hypersonic Boundary Layer Transition (BOLT) program. The system was designed to fit multiple wind-tunnel facilities, including the AEDC Tunnel 9 hypersonic test facility and UMD Ludwieg Tube. In order to design and test the system, the AEDC Mach 3 Calibration …
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