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 11 of 11 for “"Flow diagnostics"”.
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Investigation of Multi-Photon Excitation in Argon with Applications in Hypersonic Flow Diagnostics
<p>Non-intrusive flow diagnostics are essential for studying the physics of hypersonic flow wake regions. To advance the development of next generation hypersonic vehicles and to improve computational fluid dynamics techniques in the hypersonic regime, NASA needs a suitable non-intrusive diagnostic …
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4D combustion and flow diagnostics based on tomographic chemiluminescence (TC) and volumetric laser-induced fluorescence (VLIF)
Optical diagnostics have become indispensable tools for the study of turbulent flows and flames. However, optical diagnostics developed in the past have been primarily limited to measurements at a point, along a line, or across a two-dimensional (2D) plane; while turbulent flows and flames are …
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Heat and Mass Transfer Performance and Flow Characteristics of an Offset -Strip Array at Reynolds Numbers Up to 100,000
… fin array in the range 10,000 < Re < 100,000. Flow diagnostics show the flow in the offset-strip fin array exhibits vortex shedding at two frequencies, depending on the location from which the vortices are being shed. The associated Strouhal numbers are approximately 0.15 and 0.20. The PIV …
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Design and flow characterization of an indraft supersonic wind tunnel for scramjet testing
… features are large windows for advanced optical flow diagnostics, modular experimental mounting system, cycle time under 15 minutes, and adjustable size up to 5.25" x 5.25" x 25". The bulk of this thesis research focuses on flow characterization using a Mach 2.5 nozzle and a test section of 5.25" …
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Performance of an airfoil with a power-saving, tab-assisted flap system
… aid in the analysis of the concept and provide flow diagnostics. The data were compared to computational results which compared well with the exception of flap and tab deflection cases where large regions of unsteady separated flow were present. All data were taken at a Reynolds number of 1.8 …
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Advanced Instrumentation and Measurements Techniques for Near Surface Flows
… in laboratory experiments, and advanced diagnostics become valuable in providing data not available from traditional means. A new variant of Doppler global velocimetry (DGV) known as cross-correlation DGV is developed to measure boundary layer profiles on a wind turbine blade airfoil in …
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Shear Stress-Mediated Tumor-Endothelial Cross Talk Regulates the Angiogenic Potential of Breast Tumors In Vitro
… interstitial fluid pressure and aberrant flow shear stress within the tumor microenvironment. While research has shown that the hydrodynamics of the tumor vasculature reduce transport and uptake of therapeutic agents, the underlying mechanisms by which fluid forces regulate vascular …
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Multiphase Flow Dynamics in Confined Domains—A DNS Study of Bubbly, Thermal and Riblet-Induced Turbulence
… of multiphase and wall-bounded turbulent flows using high-fidelity direct numerical simulations (DNS), with an emphasis on the fundamental mechanisms governing heat transfer, turbulence modulation, and instability-driven transition. By systematically studying three canonical …
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Rotor Wakes; Formations, Interactions, and Design
… this dissertation investigates the fundamental flow physics of rotor wakes and presents a rotor design methodology that enables the creation of mission-tailored wakes for improved aero-propulsive integration. These goals are addressed through a series of experimental campaigns involving both …
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Development of Specialized Laser Doppler Velocimeters for High Resolution Flow Profile and Turbulence Spectral Measurements
… are always in need of innovative instruments for flow velocity measurements. An ideal instrument would be non-intrusive, have a very fine spatial resolution as well as a very fine temporal resolution, be able to measure three-components of velocity, and be compact. Through recent advancements, …
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Design and application of a novel Laser-Doppler Velocimeter for turbulence structural measurements in turbulent boundary layers
… to the transport of turbulence in boundary layer flows. Due to the unique performance of the probe, many aspects of LDV instrumentation development were addressed. The LDV configuration was optimized for lowest uncertainties by considering the demanding applications of particle position and …