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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 30 for “"Ground Effect"”.
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The aerodynamics of multi-element wings in ground effect
… investigation into a multi-element wing in ground effect was conducted. A dual strategy was used within the research incorporating both experimental and computational techniques. The primary application of this research is within the field of motorsport. However the results also have …
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Wake deceleration of a racecar multielement airfoil in ground effect
… known as wake bursting, causing an adverse effect on the downforce generated. Since the phenomenon of off-the-surface flow reversal occurs as a result of retardation of a wake under adverse pressure gradients, wake bursting is also referred to as wake deceleration in this study. A …
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The aerodynamics of a diffuser equipped bluff body in ground effect
… physics of a diffuser equipped bluff body in ground effect has been undertaken. Situated at the rear of a racing car undertray, the diffuser is an important component and the least understood part of the vehicle. Diffuser performance can change dramatically with vehicle ride height. This …
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Computational Fluid Dynamics Analysis of Inverted, Multi-Element Airfoils in Ground Effect
… of traction between the race car’s tires and the ground ultimately allowing the drivers to turn at faster speeds. Commonly used aerodynamic devices are a front and rear wing; the wing cross sections are defined by configurations of multiple 2D airfoils extruded across the wing’s span. This thesis …
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Dynamics and stability of flow past a circular cylinder in ground effect
… cylinder placed near and parallel to a moving ground. The study consists of four main parts: (i) wind tunnel experiment, (ii) numerical simulation, (iii) linear stability analysis, and (iv) proper orthogonal decomposition (POD) analysis. The main focus of the study is on the cessation of …
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A theoretical and experimental investigation of the annular jet ground effect machine
In this work the infrared absorption of neutron irradiated silicon was compared to that of non-irradiated silicon at room and liquid nitrogen temperatures. It was found that instead of the 1.75 micron absorption band that has been mentioned in numerous papers transmission was completely cut off …
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Computational Prediction of Stall Aerodynamics and Evaluation of Ground Effect for a Generic Transport Aircraft
… of aerodynamics in close proximity to the ground considering cross-wind conditions. Data for aerodynamic models for normal and extended flight conditions are traditionally obtained from wind tunnel tests using different methods such as static, forced oscillation and rotary balance tests. …
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Active Flow Control of a Three-Element Airfoil in Unbounded Flow and in Ground Effect
… the 30P30N airfoil both in unbounded flow and in ground effect for various flight heights. The airfoil flow field is then subjected to Active Flow Control (AFC) by injecting a uniform jet or by including a synthetic jet near the leading edge of the flap to change the momentum in the boundary layer …
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The aerodynamic interaction of a rotating wheel and a downforce producing wing in ground effect
… open wheeler race cars depend heavily on the effectiveness of the aerodynamic package. The front wing and front wheels make a significant contribution and therefore must be well understood. Previous investigations have focused on the aerodynamic characteristics of either an isolated downforce …
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Aerodynamics and multi-fidelity surrogate modelling of an inverted wing with vortex generators in ground effect
… 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 wing of race cars. …
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On the application of variational mechanics in modeling the flow around a cylinder in ground effect
… has not yet been applied to a cylinder in ground effect. These two models are applied to modeling a cylinder in `ground effect', and the predictions of these two models are compared with a computational fluid dynamics (CFD) simulation by considering the pressure distribution and forces on …
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Numerical Simulations and Studies on Round Jet Impingement, Twin Jet Impingement and Helicopter Rotor Blades Ground Effect
… The convention air jet impingement on ground surface was compared to air jet impingement on water surface in the range of Mach number from 0 to 0.3. Currently the studies on round jet impingement on water surface are very few. The goal of this research is to study the difference of …
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Design and dynamic modeling of an unmanned underwater vehicle for submerged surface inspection exploiting hydrodynamic ground effect
… inspections. This thesis research explores the ground effect hydrodynamics due to the motion of a body near a surface.
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An Experimental Investigation of Ground Effect on a Quad Tilt Rotor in Hover and Low Speed Forward Flight
… in helicopter mode was experimentally studied in ground effect (IGE) and out of ground effect (OGE). A 0.03 geometrically scaled fuselage/wing model of the QTR was tested in hover and very low speed forward flight. Fixed-pitch propellers were used to model the rotors. In order to avoid the …
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Experimental Investigation of Drag Reduction by Trailing Edge Tabs on a Square Based Bluff Body in Ground Effect
… of drag reduction devices on a bluff body in ground effect. It has previously been shown that the addition of end-plate tabs to a rectangular based bluff body with an aspect ratio of 4 is effective in eliminating vortex shedding and reducing drag for low Reynolds number flows. In the present …
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Empirical Evaluation of Ground, Ceiling, and Wall Effect for Small-Scale Rotorcraft
<p>Ground effect refers to the apparent increase in lift that an aircraft experiences when it flies close to the ground. For helicopters, this effect has been modeled since the 1950's based on the work of Cheeseman and Bennett, perhaps the most common method for predicting hover performance due to …
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Experimental aerodynamic comparison of two magnetically levitated (MagLev) vehicle designs
… (MagLev) high speed vehicles operating in ground effect. A high speed moving track system was designed and developed to be used in the Virginia Tech Stability wind tunnel. Flowfield surveys confirmed the system was providing proper flow simulation. Aerodynamic tests were conducted on two …
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A computational study of a lifting wing in close proximity to a moving ground plane
… of a DHMTU lifting wing flying in ground effect. In particular, the performance of the wing in the presence of waves was of interest. But first a reliable computational model had to be developed to simulate waves flowing past the wing. Therefore the objective of this study was to …
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