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 “"oil flow visualization"”.
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Some Features of Tip Gap Flow Fields of a Linear Compressor Cascade
… study of three-dimensional turbulent tip gap flows in the linear cascade wind tunnel, for two different tip gap clearances (t/c=1.65% and 3.3%). The experiments focus on near-wall flow field measurements for the stationary wall and moving wall, and static pressure measurement on the low …
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Understanding Unsteady Corner Separation Within Wing-Body Junction Flows
<p>Wing-body junction flows, formed at the interface between a wing and fuselage surface, are a complex, coupled, three-dimensional, turbulent flow field. This thesis focused on the unsteady corner separation that develops at the trailing edge of this wing-body junction under certain conditions. A …
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Aerodynamic characterization of a Griffith-type transonic, laminar-flow airfoil
… Tunnel Facility on a Griffith-type transonic airfoil to evaluate the effectiveness of its laminar flow qualities and boundary-layer flow-control characteristics in the transonic regime. Airfoil surface and wake pressure data were acquired to characterize the aerodynamic performance across a range …
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Performance optimization of a subsonic Diffuser-Collector subsystem using interchangeable geometries
… 3-hole and 5-hole probes were traversed into the flow to generate multiple diffuser inlet and collector exit performance profile plots. Surface oil flow visualization was performed to gain an understanding of the complex 3D flow structures inside the diffuser-collector subsystem. The cutback …
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Boundary Layer Separation Control on a Salient Back-facing Ramp
… feasibility and the performance of the serration flow control devices on a salient edge where the laminar boundary layer separation is two-dimensional. Three geometries of serrations: a sharp delta, a double delta and a divergent delta are examined on 15° and 30° deflected, backward-facing ramps. …
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Aerodynamics of Runback Ice Accretions
… and stalling angle-of-attack of the NACA 3415. Flowfield investigations using fluorescent-oil flow visualization and hot-wire anemometry showed that the simulations that were similar in height to the clean-model local boundary-layer thickness acted to stabilize the recovering boundary layer, …
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The effects of vortex generating fins and jets on the crossflow separation of a submarine in a turning maneuver
… of fin and jet vortex generators on the crossflow separation of a 688 class submarine in a turning maneuver was studied. The vortex generators are located on the top and bottom centerline of the submarine. The intent of the vortex generators is to improve turning performance by changing the …
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Iced Airfoil Separation Bubble Measurements by Particle Image Velocimetry
Previous iced airfoil investigations have demonstrated somewhat reduced aerodynamic penalties resulting from a three-dimensional ice simulation, compared to those of a two-dimensional ice simulation of a representative cross section. Correspondingly, the current measurements revealed accelerated …
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Optimal design of municipal and irrigation water distribution systems
In two-dimensional flow, the point of flow separation from the surface coincides with the point at which the skin friction vanishes. However, in three-dimensional flow, the situation is much more complex and the flow separation is rarely associated with the vanishing of the wall shear stress except …
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Effects of Mach Number and Flow Incidence on Aerodynamic Losses of Steam Turbine Blades
… total pressure, and endwall static pressures. Flow visualization techniques such as shadowgraph photography and color oil flow visualization were performed to complement the measured data. When the exit Mach number for both nozzles increased from 0.9 to 1.1, the total pressure loss coefficient …
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A Study of Compressible Turbulent Free Shear Layers Using Laser Doppler Velocimetry (Supersonic Flow, Mixing, Recirculating)
… layers formed by the separation of a Mach 2.43 flow over a backward facing step was conducted. Two different wind tunnel test sections were used to achieve a constant pressure separation of the shear layer at the backstep corner so that the developing free shear layer was unaffected by …
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High Reynolds Number Turbulent Boundary Layer Flow over Small Forward Facing Steps
… single and 2 point velocity fluctuations and, oil flow visualization. Pressure fluctuation measurements were made 5 boundary layer thicknesses upstream of step to 22 boundary layer thickness (or 600 step heights for smallest step size) downstream of the step. The results show that the steps …
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Time-Resolved PIV Measurements of Ship Airwakes with Quartering Winds
… Frigate Ship No. 2 (SFS2) with quartering wind flow directions was studied in a low-speed wind tunnel facility. Surface oil flow visualization and time-resolved stereoscopic and planar particle image velocimetry (PIV) measurements were made for three crosswise planes and a single centerline …
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An experimental study of the aft guide vanes of an engine bypass nacelle for low-boom supersonic flight
… is created during this process. The high-flow nacelle bypass geometry includes a forward and aft fairing to direct the flow around the gearbox, a set of thin forward guide vanes, and a set of thick, strut-like aft guide vanes. The aft guide vanes, which also serve structural purposes, are …
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Experimental Study of the Heat Transfer on a Squealer Tip Transonic Turbine Blade with Purge Flow
The objective of this work is to examine the flow structure and heat transfer distribution of a squealer tip rotor blade with purge flow cooling and provide a comparison with a basic flat tip rotor blade without purge flow cooling, under transonic conditions and high inlet free stream turbulence …
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The effects of micro-vortex generators on normal shock wave/boundary layer interactions
… interactions (SWBLIs) are complex flow phenomena that are important in the design and performance of internal supersonic and transonic flow fields such as engine inlets. This investigation was undertaken to study the effects of passive flow control devices on normal shock …
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Qualitative Methods Used to Develop and Characterize the Circulation Control System on Cal Poly's AMELIA
… system produced highly directional, nonuniform flow, and required significant modification in order to generate flow suitable for representation in predictive software. The effort and methods used to generate uniform flow along the circulation control slots is detailed herein. Additionally the …
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Oil flow from compressor valve to discharge tube
Oil existence is important for compressor operation because it provides lubrication, cooling and sealing. But the discharge process of the compressor inevitably entrains some oil in the refrigerant vapor, which makes oil leave compressor and circulate in the system. For better heat transfer and …
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A mach 1.95 free-jet facility for experimental investigation of injectant flow patterns
Inspired by the need to study injectant flow patterns near the test surface, a supersonic free-jet facility was designed and constructed. This facility provides a Mach 1.95 flow over a test section area of 6.35 cm by 5.08 cm. The facility was thoroughly tested and proved that it is durable, …
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Experimental Investigation of Active Wingtip Vortex Control Using Synthetic Jet Actuators
… distributed in rows along the span of the wing. Oil droplet flow visualization was also performed to understand the effect of SJA near the wingtip.</p> <p> The synthetic jet and vibration had effects on the drag. The synthetic jet with vibration decreased the drag only slightly while vibration …
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