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 35 for “"Vortex Generator"”.
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Wedged Vortex Generator Applications for Marine Vessels
This thesis investigates the effectiveness of vortex generators (VGs) in reducing viscous drag in hydrodynamic applications. Initial experimental and computational fluid dynamics analyses identified wedge-shaped VGs as the optimal design for flow manipulation. Comparative testing of three wedge …
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Shipping decarbonization through sea route optimization & Vortex generator resistance reduction
… this thesis also discusses and tests the use of Vortex generators (VGs) as an innovative tool for ship resistance reduction. The theory shows that the use of VGs is an effective method for potentially reducing ship’s form factor resistance, with an expected reduction of up to 30% of total …
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Vortex generator arrays in air-cooled condensers for power plant applications
… with different configurations of delta-winglet vortex generators (VG). A low and high Reynolds number case of 225 and 1123 is simulated which is representative of the lower and upper limits of the air velocity range between 1-5 m/s in a typical air-cooled condenser (ACC) system. The effects of …
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Optimization of a Vortex Generator Configuration for a 1/4-Scale Piper Cherokee Wing
… tests were performed to determine an optimum vortex generator configuration for a 1/4-scale model of the Piper Cherokee wing. Several variables were incorporated into this experiment in an effort to determine their influence on vortex generator performance enhancement (or degradation). Vane …
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The Effects of Vortex Generator Jet Frequency, Duty Cycle, and Phase on Separation Bubble Dynamics
Vortex generator jets (VGJs) have proven to be effective in minimizing the separation losses on low-pressure turbine blades at low Reynolds numbers. Experimental data collected using phase-locked particle image velocimetry and substantiated with a hot-film anemometer were used to answer fundamental …
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Investigation of film cooling effectiveness from cylindrical cooling hole with anti vortex generator by numerical simulation
… deals numerical study of the effect of anti vortex generator (AVG) on the film cooling performance of a circular cooling hole which has diameter (d = 20 mm) on a flat plate. The interaction between the jet cooling air and mainstream will result kidney vortex which will eliminate the film …
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Phase Locked Flow Measurements of Steady and Unsteady Vortex Generator Jets in a Separating Boundary Layer
<p>Vortex generator jets (VGJs) have been found to be an effective method of active separation control on the suction side of a low pressure turbine (LPT) blade at low Reynolds numbers. The flow mechanisms responsible for this control were studied and documented in order to provide a basis for …
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The vertical flow centrifugal gas-liquid separator and its application to the removal of gases from geothermal wells
… the gastube inlet diameter and the design of the vortex generator. Large gastube diameters have been shown to give high separation efficiencies. Sharp vortex generator blade exit angles have been shown to give the best performance especially with slugging inlet flow which occurs at relatively low …
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Aerodynamics and multi-fidelity surrogate modelling of an inverted wing with vortex generators in ground effect
A study of an inverted single-element wing with vortex denerators in ground effect is presented. Counter-rotating and co-rotating rectangular-vane type vortex generators with different device heights are studied on the suction surface of the wing. The primary application of this study is a front …
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Heat Transfer Enhancement Using Tip and Junction Vortices
… transfer benefit and pressure-drop penalty of vortex generator enhancements.
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Application of passive flow control to mitigate the thromboembolic potential of bileaflet mechanical heart valves: an in-vitro study
… are small features on solid surfaces, such as vortex generators (VGs), that alter flow to achieve desired performance. The specific aims of this study are (1) develop a methodology to evaluate thromboembolic potential (TEP) of BMHVs using in-vitro particle image velocimetry technique, (2) …
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Multidisciplinary Optimization of Next-Generation Aero-Engine Fans
… flows in aero-engine compressors, by using vortex generators. The capabilities of these devices are studied in an open testcase transonic compressor, the NASA Rotor 37, by carrying out an optimization and studying different metrics that measure the secondary flows intensity. Building on the …
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The effects of vortex generating fins and jets on the crossflow separation of a submarine in a turning maneuver
The effect 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 …
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A study of the application of air-jet vortex generators to intake ducts
… bend of the duct. It has been proposed that vortex generators may be usefully employed in such intake ducts to enhance the homogeneity of the pressure distribution at the engine face, and hence, reduce the unsteady loading on the engine. Both vane and air jets have been tested experimentally …
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The effects of micro-vortex generators on normal shock wave/boundary layer interactions
… work concentrates on analyzing the effects of vortex generators (VGs) as a flow control method by contributing a greater understanding of the flowfield generated by these devices and characterizing their effects on the SWBLI. The vortex generators are utilized with the goal of improving …
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An Experimental Study of Longitudinally Embedded Vortices in a Turbulent Boundary Layer via the Non-Invasive Comprehensive LDV Technique
… of boundary layers have been proposed, but vortex generators have proven to be an economical choice as they are often used to fix deficiencies in a flow field after large scale production of a vehicle has commenced. In order to better understand the interaction between vortex generators and …
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Geometry modification effects on a junction vortex flow
… on the upstream symmetry plane of a junction vortex region were studied. A single linearized hot-wire was used to characterize the spatial distribution of the fluctuating flow turbulent kinetic energy. The distribution was integrated to give a measure of the turbulent kinetic energy content of …
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Experimental Measurements of Vortex Breakdown with non-Isothermal Inflow
Vortex breakdown occurs in many flow applications such as weather, aerodynamics, swirl combustors, and more, introducing unsteadiness that is often undesired. While vortex breakdown has been previously investigated extensively, researchers have struggled to efficiently characterize these flows due …
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Heat transfer enhancement in a rectangular duct by using winglet and nanofluids
The vortex generators induce streamwise longitudinal vortices. These vortices disrupt the growth of the thermal boundary layer and serves to bring about heat transfer enhancement between the fluid and the fin surfaces. The geometrical configuration considered in this study is representative of a …
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