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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 71 for “"wind tunnel experiments"”.
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Anomaly Detection in Aeroacoustic Wind Tunnel Experiments
Wind tunnel experiments often employ a wide variety and large number of sensor systems. Anomalous measurements occurring without the knowledge of the researcher can be devastating to the success of costly experiments; therefore, anomaly detection is of great interest to the wind tunnel community. …
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Gap Size Effect on Low Reynolds Number Wind Tunnel Experiments
… of gap size on semi-span low Reynolds number wind tunnel experiments. The lift forces on NACA 1412, NACA 2412 and NACA 4412 half wings were measured using a strain gauge balance at chord Reynolds numbers of 100,000 and 200,000 and three different gap sizes including sealed gap. Pressure …
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Evaluation of propulsor aerodynamic performance for powered aircraft wind tunnel experiments
… mechanical ow power for a 1:11-scale, powered wind tunnel model of an advanced civil aircraft utilizing boundary layer ingestion (BLI); mechanical ow power is a surrogate for aircraft fuel burn. Back-to-back experiments of BLI and non-BLI aircraft configurations to assess the BLI benet directly …
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Drag reduction of cube-van through boundary-layer control: wind tunnel experiments and prototype road tests
… presents results of an organized and extensive wind tunnel test-program, complemented by full-scale road tests, aimed at assessing the effectiveness of two boundary-layer control procedures for reduction of the pressure drag of a cube-van. Wind tunnel results, obtained using 1/6th scale models, …
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Unsteady Simulations of Flow Around a Smooth Circular Cylinder at Very High Reynolds Numbers Using OpenFOAM
… description of incompressible turbulent flows. Wind tunnel experiments for a smooth circular cylinder at very high Reynolds numbers with an incompressible fluid are expensive. The use of Computational Fluid Dynamics, to predict flow around and behind a smooth circular cylinder, is growing in the …
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Design, optimization and flight testing of a micro air vehicle
… This has also been validated by the author’s wind tunnel experiments, also described in this thesis. The results of the wind tunnel experiments are presented. Performance of the propulsion system (motor, propeller, battery, speed controller) was evaluated using other commercially available …
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Longitudinal Vortex Generation to Enhance the Performance of Compact Heat Exchangers: Flow and Heat Transfer Behavior for Plain and Interrupted Fins
… wet-surface conditions were determined through wind-tunnel experiments. Average heat transfer enhancements of 21% for dry conditions and 23% for wet conditions are achieved for 200≤ Re≤550, with a pressure drop penalty smaller than 7%.
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Aerodynamics drag reduction of commercial trucks
… was designed and constructed from chipboard for wind tunnel experiments. The overall size of the model is 1100 mm long, 130 mm wide and 215 mm high. A same scale numerical model was also built for computational simulations.
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A Study of an Asymmetric Two-Dimensional Nozzle as A Vector-Thrust Device
… under certain constraints are also presented. Wind tunnel experiments are also conducted to obtain pressure data along the nozzle walls for verification purposes. The numerical results are found to be in good agreement with the measured data.
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Understanding the Impacts of Extreme Weather on the Power Transmission Infrastructure: A Machine Learning Approach to Quantifying Risks and Enhancing Grid Resilience
… investigates the interaction between extreme winds and power transmission infrastructure in complex terrain, aiming to quantify and predict power loss and damage to the infrastructure during such events. The study employs a comprehensive approach combining numerical weather prediction models, …
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An experimental study of the relationship between forces and moments and vortex breakdown on a pitching delta wing
Wind-tunnel experiments were performed to study the complex flow mechanisms on a 70-deg. sharp leading-edge delta wing model at both static and dynamic conditions at a Reynolds number of 1.43 $\times$ 10$\sp6$. Large amplitude oscillatory motions were produced by sinusoidally pitching the model …
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Wind effects on a hemispherical dome
A review of the past wind tunnel experiments involving the measurement of pressures over the surface of a hemispherical dome is made, and the flow parameters of these experiments are compared. A hemispherical dome is subjected to a flow in the open-throat wind tunnel at VPI&SU, and the resulting …
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A Numerical Study of Unsteady Two-Dimensional Subsonic Compressible Base Flow
… that has been found to reduce the base drag in wind-tunnel experiments is a trailing-edge cavity. However, the flow mechanisms responsible for this drag reduction had not been determined from the limited experimental data available. Therefore, the unsteady flow past a slender two-dimensional …
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Analysis of the dynamic stability derivatives for high angle of attack aircraft
… model more difficult to obtain. In this research wind tunnel experiments are performed on an F-5 air-craft model at high angles of attack, with small oscillations about the body oriented roll axis. In addition the free stream environment can be configured in one of three ways: l) straight uniform …
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On the passive oscillations of a splitter plate in stratified turbulence
Wind tunnel experiments were conducted to understand the turbulence-induced motions of a rigid at plate able to rotate at its quarter span. Dominant coherent motions that varied along the vertical direction were imposed on the incoming flow using a variety of tapered cylinders. Emphasis is placed …
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Design of a model propulsor for a boundary layer ingesting aircraft
… simulators for 1:11 and 1:4 scale model wind tunnel investigations of an advanced civil transport aircraft with boundary layer ingestion (BLI). The electrically powered single-stage propulsors represent the ultra-high bypass ratio turbofan engines on a full-scale conceptual aircraft …
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Turbulent wakes in turbulent streams
Direct numerical simulation and wind tunnel experiments have been used to study the effects<br/>of free-stream turbulence on axisymmetric wakes. In both cases the wake was introduced to<br/>various turbulent streams having various levels of turbulence intensity and length scales. It<br/>was found …
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Modelling of Wall Pressure Fluctuations Induced by Turbulent Boundary Layer Flow
… when predicting the power spectral density for wind tunnel experiments. The Rackl and Weston model has the lowest mean squared error when predicting the power spectral density for flight test data. Current advancements in power spectral density wall pressure fluctuation prediction have expanded …
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The effect of Whitcomb winglets and other wingtip modifications on wake vortices
Wind tunnel experiments have been conducted on six different wingtip configurations to determine their wake vortex characteristics. The trailing wingtip vortex was probed by a 1/8 inch diameter five hole yawhead pressure probe in the VPI & SU Stability Wind Tunnel. The vortex tangential and axial …
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Multidimensional and High Frequency Heat Flux Reconstruction Applied to Hypersonic Transitional Flows
… fluctuations on test articles in a hypersonic wind tunnel with a small curvature radius. In the present theoretical/numerical study a multi-resolution formulation for the direct and inverse reconstruction of the heat flux from temperature sensors distributed over a multidimensional solid in a …
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