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 40 for “"Hot-wire anemometry"”.
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Constant Voltage Hot-Wire Anemometry for the Boundary Layer Data System
… Layer Data System (BLDS), a constant voltage hot-wire anemometer (CVA) is implemented into the BLDS for flight-testing. The hot-wire anemometer was chosen as an alternative to the traditional pressure probe because of the ability to measure both average velocity and fluctuating velocity within …
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The use of hot-wire anemometry in studying supersonic slot injection into a supersonic flow
… air stream (M = 2.91) was studied with a dual hot wire probe. This probe was used to simultaneously determine total temperature and mass flux. Mean profiles across the entire flow field at three axial stations (x/h = 4, 10, 20) were obtained, as well as the temperature and mass flux turbulence …
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Point Doppler velocimetry measurements in circular jets
… technique with capabilities that are similar to hot wire anemometry, but without inserting a probe into the flow. The insertion of a probe into a flow can affect the flow, resulting in inaccurate measurements.;PDV measurements for 1 inch diameter standard, swirling, and annular jets have been …
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The measurement of wind tunnel flow quality at transonic speeds
… obtained in the free stream. Traditionally hot wire anemometry and fluctuating pressure techniques have been used to quantify the unsteady characteristics of a wind tunnel. This research focuses on the application of these devices to the transonic flow regime. Utilizing hot wire anemometry, …
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Multi-Row Film Cooling Boundary Layers
… including: particle image velocimetry, hot wire anemometry, pressure sensitive paint and discrete gas sampling.
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BOUNDARY LAYER ON FLAT PLATE WITH LEADING EDGE PATTERNS
… EXPERIMENTALLY INVESTIGATED BY MEANS OF SMOKE-WIRE FLOW VISUALIZATION AS WELL AS THE HOT-WIRE ANEMOMETRY. DIFFERENT LEADING EDGE PATTERNS SUCH AS TRIANGULAR, SINUSOIDAL AND NOTCHED PATTERNS WITH IDENTICAL WAVELENGTH AND AMPLITUDE WERE USED TO PRODUCE UNIFORM SIZE VORTICES. IN ADDITION, THE …
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Aerodynamics of Runback Ice Accretions
… 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, delaying stall past the stalling angle-of-attack of the clean case.
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Measurements of surface shear stresses under a three-dimensional turbulent boundary layer using oil-film laser interferometry
… to angles obtained from surface oil flows, hot wire anemometry, and LDV measurements. Also, the magnitude of the skin friction coefficients were compared to independently obtained skin friction coefficients. The data agreed to within experimental error outside the effects from the vortex …
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Measurements of entropy-layer instabilities over cone-ogive-cylinders at Mach 6
… (BAM6QT) using surface pressure transducers and hot-wire anemometry. A long cone-ogive-cylinder model with interchangeable cone-ogive noses was used to generate the shock curvature that resulted in an entropy layer conducive to instability growth. The nosetip angles of the cone-ogive range from …
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Effect of large distributed roughness near an airfoil leading edge on boundary layer development and transition
… measurements were obtained through the use of hot-wire anemometry at Reynolds numbers of 0.75 $\times$ 10$\sp6$, 1.25 $\times$ 10$\sp6$, and 2.25 $\times$ 10$\sp6$. These measurements included mean and fluctuating velocity, turbulence intensity, flowfield intermittency, frequency content, and …
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Flow characterization of the UL Smoke Box and spot-type smoke detectors
… velocity data using laser Doppler and hot-wire anemometry. With excellent qualitative comparisons between experimental and computational results, flow characterization using the laminar flow model available in the commercial software package FluentRTM was sufficiently achieved. The …
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The Three-Dimensional Turbulent Boundary Layer on a Rotating Disk
… and radial velocities were measured using hot-wire anemometry. The mean flow, turbulent intensity, energy spectra, skewness and kurtosis of the flow have been analyzed and compared with 2DTBL measurements. It was found that the measurements collapsed well for z/9 > 0.3-0.4 in outer scaling. …
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The Effect of Persistent Vortices on Boundary Layer Behavior in Turbulent Flow along a Kelvin-Stuart Cat's Eyes Wavy Wall
… flows. To test the theory flow visualization and hot-wire experiments in a water tunnel at moderate Reynolds number reveal that a persistent vortex will relaminarize the boundary layer along wavy even in the presence of freestream turbulence. This result is consistent with Dawson [7] who found …
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Hot-Wire Anemometer for the Boundary Layer Data System
<p>Hot-wire anemometry has been routinely employed for laboratory measurements of turbulence for decades. This thesis presents a hot-wire anemometer suitable for use with the Boundary Layer Data System (BLDS). BLDS provides a unique platform for in- flight measurements because of its small, …
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A wind tunnel investigation of a wing-tip trailing vortex
… of the vortex in the near-tip regions. Hot-wire anemometry was used to study the vortex at 10 chordlengths. Two vortices were found in the tip-flow studies, a primary vortex core formed on the suction side surface of the wingtip and a weaker secondary vortex formed on the endcap. The …
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Experimental investigations of natural circulation in a separate-and-mixed effects test facility mimicking prismatic modular reactor (PMR) core
… measurement techniques such as: (1) the hot wire anemometry (HWA), (2) flush-mounted micro-foil sensors, and (3) thermocouples that are capable of providing local measurements at different axial and radials positions along both channels. These measurement techniques have been integrated …
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MEAN TURBULENCE STRUCTURE IN STRONGLY HEATED AIR FLOWS.
… were obtained using constant temperature hot-wire anemometry and resistance thermometry for velocity and temperature, respectively, employing a single short wire probe. The technique developed and employed for the use of a single short hot wire in velocity measurements in non-isothermal …
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Experimental and analytical investigation of multiple jets in a cross-flow
Extensive measurements using hot-wire anemometry were carried out for single jet, tandem jets, and side-by-side jets for a velocity ratio of 2, and a jet spacing of 4 for the latter two cases. The measurements yielded axial mean velocity, turbulence intensities, and Reynolds stresses for four …
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