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 57 for “"wind tunnels"”.
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Accurate aeroacoustic measurements in closed-section hard-walled wind tunnels
… aircraft, however aeroacoustic measurements in wind tunnels are still required. There is a growing interest in simultaneous aerodynamic and aeroacoustic measurements in hard-walled closed-section wind tunnels. The research hypothesis of this work is whether accurate aeroacoustic measurements are …
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High-fidelity modeling of high-enthalpy plasma wind tunnels for hypersonic testing
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-08-01
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Understanding and Exploiting Wind Tunnels with Porous Flexible Walls for Aerodynamic Measurement
The aerodynamic behavior of wind tunnels with porous, flexible walls formed from tensioned Kevlar has been characterized and new measurement techniques in such wind tunnels explored. The objective is to bring the aerodynamic capabilities of so-called Kevlar-wall test sections in-line with those of …
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Analysis and reconstruction of dynamic-stall data from nominally two-dimensional aerofoil tests in two different wind tunnels
… RAE9645 aerofoil models in two different wind tunnels. The first of these data came from the aerofoil that was tested in the Department of Aerospace’s Handley Page Wind Tunnel. The second data set was from tests carried out by QinetiQ on an aerofoil in the Department of Aerospace’s Argyll …
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The effect of the boundary layer present in wind tunnels on the aerodynamic drag of a model truck
… boundary layer displacement thickness in a wind tunnel. The device is then used to examine the effect that this boundary layer has on the aerodynamic drag of a standard truck, which is classified as a bluff body with a high ground clearance and the same truck fitted with skirts all round, …
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Design and Evaluation of an Active Yaw and Turbulence Generation System to Produce Unsteady Flow in Automotive Wind Tunnels
… generation system (TGS) for automotive wind tunnels that replicates on-road conditions using three combined subsystems. The focus of this thesis is primarily on one of the TGS subsystems, the unsteady yaw generation subsystem, which was made up of an airfoil-flap cascade. Tests were …
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Background Noise Reduction in Wind Tunnels using Adaptive Noise Cancellation and Cepstral Echo Removal Techniques for Microphone Array Applications
… Ratios to simulate noise propagating down a wind tunnel circuit. The second experiment contained only the primary source and the wedges were removed from the floor to simulate reflections found in a wind tunnel environment. The techniques were applicable to both signal microphone and array …
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AEROSOL EFFECTS IN HIGH SUPERSONIC FLOWS
… and carry significantly less risk, although wind tunnels can only replicate a subset of the conditions experienced in actual flight. One of these conditions that has not been adequately captured in wind tunnels is the effect of particulates in the atmosphere. Typical wind tunnels use a pure, …
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Design, construction and characterization of a wind tunnel
The wind tunnel is the most fundamental test equipment for aircraft testing and studying aerodynamics. Because of the complexity of the test-subject's geometry, it is difficult to study the aerodynamic pattern simply based on theoretical calculations. Most of the aerodynamics experiments still use …
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The Patch Integral Method (PIM), a New Heat Transfer Analysis Tool for Hypersonic Wind Tunnel Facilities at NASA Langley
The NASA Langley Research Center hypersonic wind tunnels serve a vital role in the field of hypersonics in both helping validate CFD predictions and producing experimental results. These tunnels have been heavily utilized for decades by numerous planetary missions, such as MSL and Orion, commercial …
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Scaling Sensitivity of Focused Laser Differential Interferometry Across Facilities
… response of FLDI changes with the size of a wind tunnel facility. The goal is to alter the optical elements to achieve the same sensitivity across facilities so that data can be directly compared and the underlying physics evaluated. Analytical FLDI transfer functions, derived from Andrew …
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Development and validation of an Active Grille Shutter testing platform
… of Active Grille Shutters (AGS) and radiators in wind tunnels. Additionally, a generic pressure plate is designed to mimic commercial radiators, and a testing procedure is developed for AGS testing. Together, they provide a comprehensive and consistent platform for AGS testing with or without the …
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Performance tests and cooling effect distribution of the V.P.I. forced draft cooling tower
… to the research conducted on airplanes in wind tunnels and on boat hulls in towing tanks, is necessary. Models used should be so constructed that quantity, condition, and velocity of air; quantity and condition of water; and type and arrangement of filling may be controlled. It is by the …
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Validation of 3-D ice accretion documentation and replication method including pressure-sensitive paint
… replicas of ice accretions generated from icing wind tunnels are fabricated to perform aerodynamic tests in dry-air wind tunnels. The currently employed replication method consists of creating molds from original ice accretions and producing castings from the molds for wind tunnel testing. While …
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Hypersonic test facilities: requirements analysis and preliminary design
… This will require more capable hypersonic wind tunnels with larger test sections, longer run times, and test gases more closely resembling the fluid to be encountered by the vehicle being developed. This document will review the current hypersonic testing capability, examine the operating …
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Development of a data reduction method for a high frequency angle probe
… aerodynamic measurements in transonic cryogenic wind tunnels. The probe measures time-resolved total pressure, static pressure, angle of attack, and yaw angle from readings of four pressure transducers. The unique feature of this probe, as compared to a conventional multi-hole directional probe, …
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The effect of departure from ideality of a multiply ionized monatomic gas on the performance of rocket engines
… but that data obtained from hypersonic arc jet wind-tunnels can be significantly influenced by the presence of the interactions.
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Parametric investigation of flow-sound interaction mechanism of circular cylinders in cross-flow
… have been performed in three different wind-tunnels of different cross-sectional areas. The research is motivated by the fact that most of the criteria developed to date, fail to predict the destructive phenomena of acoustic resonance in 30-40% of the cases.
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Robust Bayesian Anomaly Detection Methods for Large Scale Sensor Systems
Sensor systems, such as modern wind tunnels, require continual monitoring to validate their quality, as corrupted data will increase both experimental downtime and budget and lead to inconclusive scientific and engineering results. One approach to validate sensor quality is monitoring individual …
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The development of the hydraulic analogy
… since the present day experimental technique in wind tunnels present economical and scientific difficulties. A large amount of knowledge can be obtained from analogy research in this field. The analogy described in the paper gives accurate results; the proposed apparatus is inexpensive, and …
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