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 32 for “"high speed flow"”.
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Unstructured technology for high speed flow simulations
… placed on the effects of the chemistry model in flows where ionization and dissociation are dominant characteristics of the flow field. Laminar and turbulent solutions over a flat plate are presented and compared to exact solutions and experimental data. Three dimensional higher order solutions …
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A Novel Dual-Imaging Approach for Visualizing Multiphase and Droplet Interactions including Shock-Driven Flows
… including supersonic and hypersonic systems in highly humid conditions, as well as the ongoing space exploration efforts from global space centers as well as private space companies. Understanding the interactions between shockwaves and droplets that impact on solid surfaces is critical due to …
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Advances in high-speed store separation for upward-ejected stores and dynamic cavity doors
… analysis to predict such store trajectories in high-speed flow. Several store designs are analyzed at various ejection velocities in Mach 4 and Mach 6 conditions. The trajectory results show that streamlined store geometries may not induce sufficient drag to clear the aircraft after ejection. …
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Development and Application of Particle Image Velocimetry in High-Speed Separated Flow: Two-Dimensional Base Cavities
… velocity data over a planar region in high-speed separated flows for the quantitative analysis of turbulent and unsteady flow structures. This PIV system is the first of its type to incorporate sub-micron seed particles and birefringent image shifting for the resolution of flow velocity …
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Numerical investigation of the wall temperature effects on shock-wave turbulent boundary layer interactions
… phenomenon in many practically relevant high-speed flow applications such as re-entry vehicles, air-breathing engines, rocket nozzles, etc. STBLI occurs in supersonic flow near solid surfaces where a shock wave is generated or reflected. The complex interaction is typically characterized …
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Time -Resolved Visualization and Analysis of Compressible Blunt -Base Cylinder Wakes
High-speed flow visualization of these wakes is also performed. Both conventional cross-correlation analysis and cross-correlation analysis conditioned on the coherent structures are performed to measure the convection velocity of the coherent structures. The coherent structures in the developing …
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Integration and Evaluation of Unsteady Temperature Gages for Heat Flux Determination in High Speed Flows
… surface temperature gages designed to operate in high speed flow. Heat flux through the surface of the test article was determined from the unsteady temperature by applying a 3D reconstruction algorithm based on a Green's function approach. The surface temperature gages used in this work were 1.59 …
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Quantification of Spalart-Allmaras Turbulence Modeling Uncertainties for Hypersonic Flows Utilizing Output-Based Grid Adaptation
… is quantified for steady non-reacting hypersonic flows using a coarse-grained uncertainty metric. Output-based adaptation is utilized to guarantee negligible numerical error with complex flow features, such as shock wave-boundary-layer interactions (SBLI). The adapted meshes are generated using …
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Design and performance characterization of high power density air-cooled compact condenser heat exchangers
… is attributed to the implementation of high-speed compressible air flow in circular microchannels and two-phase condensation flow of refrigerant in rectangular minichannels to achieve high heat transfer performance in a compact design. These advancements are enabled by recent …
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Generalized spatial discretization techniques for space-marching algorithms
… of computational blocks. Each block has inflow and outflow boundaries suitable for space marching. A completely generalized indexing strategy utilizing tetrahedra is used within each computational block. The solution to the flow in each block is found independently in a fashion similar to …
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Design and manufacturing of a VTOL Micro Aerial Vehicle
… a 10" VTOL Micro Aerial Vehicle capable of high-speed forward flight. The innovative design incorporates a pair of counter-rotating, variable pitch propellers enclosed in a protective duct structure. Independent control of propeller pitch provides thrust and yaw control for the vehicle while …
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Ramp control strategies and geometric design implications of high-speed automated transportation systems
… is an important aspect of Intelligent Vehicle Highway Systems (VHS) Technology. An existing traffic flow model is utilized to generate a non-overtaking, continuous traffic stream with automatic acceleration/ deceleration characteristics of the smart cars to fulfill the needs of a high-speed …
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Manufacturing and Instrumentation of an Open End Compressed Air Shock Tube
… extensively to study shock wave structures and high speed flow features. The purpose of constructing this open end shock tube was to have the ability to produce shock waves in a laboratory setting but also understand the exit flow coming out which can be applied to future studies that are beyond …
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Drag Measurements on an Ellipsoidal Body
… 10° angle of attack with respect to the oncoming flow. For both angles, the model was tested with and without flow trip strips. At the 0° angle of attack orientation, data were taken at a speed of 44 m/s. Data with the model at a 10° angle of attack were taken at 44 m/s and 16 m/s. The high speed …
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Experimental Study of Two-Phase Cavitating Flows and Data Analysis
… very low pressure. The hydrodynamic happened in high-speed flow, where local pressure in liquid falls under the saturating pressure thus the liquid vaporizes to form the cavity. During the evolution and collapsing of cavitation bubbles, extreme physical conditions like high-temperature, …
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Corner effects for oblique shock wave/turbulent boundary layer interactions in rectangular channels
… each of the streamwise corners, resulting in a highly three-dimensional flow field in the near-wall region. To examine how the corner separations can affect the ‘quasi-two-dimensional’ main interaction and by what mechanism this is achieved, an experimental investigation has been conducted. This …
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Mechanisms of Sediment Entrainment and Transport in Rotorcraft Brownout
… phenomenon of rotorcraft brownout, a dual-phase flow environment induced by a small-scale rotor hovering above a sediment bed was studied using high-speed flow visualization and particle image velocimetry (PIV). The high frame rate of the camera, combined with advanced particle recognition and …
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Aerodynamics of lifting surfaces in propeller slipstreams
The high-speed flow in the wake of the propeller also known as propeller wash, or simply propwash, can severely affect the aerodynamic forces on a lifting surface. Steady-state computational results for a symmetric SD8020 airfoil with chord length of 1 ft in a propeller slipstream at a freestream …
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Experimental and Analytical Investigation of a Two-Phase Ejector Used for Expansion Work Recovery in a Transcritical R744 Air-Conditioning System
… simple external pressure, temperature, and mass flow rate measurements was defined. According to this new metric, up to 17% of the expansion work potential was recovered. The ejector system COP was successfully maximized by using an integrated high-side pressure control mechanism. A control …
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Turbulence Statistics and Eddy Convection in Heated Supersonic Jets
… insight into the turbulence structure of high-speed jets is central to understanding and controlling jet noise. For this purpose a new instrument based on the Doppler global velocimetry technique has been developed. This instrument is capable of measuring three-component velocity vectors …
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