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 29 for “"Exit-flow"”.
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An experimental study of exit flow patterns in a multistage compressor in rotating stall
… measurements of a high-speed, 10- stage, axial-flow compressor operating in rotating stall are analyzed. Procedures used to digitize analog voltages and calibrate pressure transducers are presented. From total and static pressures measured at the exit of the test compressor, stall cell Mach …
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Analysis and design of a new updraft free-exit-flow low-head hydropower turbine system
<p>A new updraft free-exit-flow low-head hydropower turbine system is designed to enhance tailrace water quality, to minimize fish mortality in turbine flow passage, to improve turbine mechanical performance, and to reduce costs and time of hydropower development. This study applies the …
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An experimental and numerical analysis of the exit flow in a slit die for polymer melts
A slit die has been constructed to use both flow birefringence and direct pressure measurements to study the extrapolated exit pressure (Px) and the exit pressure theory used to evaluate the magnitude of the primary normal stress difference (N1) from the value of the exit pressure. Flow …
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CFD analysis and redesign of centrifugal impeller flows for rocket pumps
… the objective was to reduce the circumferential exit flow distortion of the baseline impeller. Later in the study, the objective became raising the head coefficient of the impeller. The study presented in this thesis was also undertaken to demonstrate current CFD capabilities for impeller design. …
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Manufacturing and Instrumentation of an Open End Compressed Air Shock Tube
… 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 the scope …
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Computational study of 3D turbulent flow in a tandem inducer/impeller rocket pump rotor
A computational study of the flow in a tandem inducer/impeller rocket pump has been performed using a 3D elliptic flow program including viscous effects. The axial inducer has four blades and the centrifugal impeller has eight main blades and sixteen splitter blades. The purpose of this thesis is …
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Convective Flow Patterns of a Three Generation Bifurcation Model
<p>To experimentally study the convective flow patterns of the human lung, a large scale symmetric model was built to model branching airways that air passes through during respiration. The model used in this experiment goes through three symmetrical 70¿¿ bifurcations before terminating at the …
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Manufacturing Variability in High Pressure Turbine Rotor Blades
… Navier-Stokes (RANS) CFD. From this study, an exit flow angle-based blade reorientation procedures and a functional sentencing methodology were proposed. For a statistically non-representative sample, these changes to the manufacturing process reduces the spread in stage capacity from ~±0.5% to …
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Effects of axial turbine tip shroud cavity flow on performance and durability
Flow through tip shroud cavity in a representative axial turbine vane-rotor stage environment is assessed for its role in loss generation and turbine durability. Steady and unsteady three-dimensional flow computations, complemented by control volume analyses, for varying shroud configurations …
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Showerhead Film Cooling Performance of a Turbine Vane at High Freestream Turbulence in a Transonic Cascade
… surface which protects the part from hot gas exiting the combustor. Design optimization of the airfoil film cooling system on an engine scale is a key as increasing the amount of coolant supplied yields a cooler airfoil that will last longer, but decreases engine core flow—diminishing overall …
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Micro-Evaporator Design and Investigation of Phase Change in Tailored Microchannels
… fluid without the presence of the bubbles at the exit flow. This thesis presents an experimental study of flow evaporation in micro-evaporators with tailored microchannel walls, demonstrating the ability to provide a stable flow of evaporated fluid for energy conversion and chip cooling …
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The Effects of Collisions on Plasma-Sheath Transition
… that gives the lower bound of the plasma exit flow speed, also known as the Bohm speed. Traditionally, the Bohm speed is evaluated in the asymptotic limit of an infinitely thin sheath and ignores the transport physics in the plasma-sheath transition problem. Whereas in practical …
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A relaxation method for the solution of rotational transonic nozzle flow
… In fact, in the cases considered here inlet flow nonuniformities produced effects greater than those which resulted from a consideration of just the two-dimensionality of the flow. For the hyperbolic nozzle and the turbofan bypass nozzle, two-dimensional effects were found to produce a …
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Numerical Loss Prediction of high Pressure Steam Turbine airfoils
… profile) as a function of angle of incidence and exit Mach numbers, is numerically computed at 0.3 axial chords downstream of the trailing edge. It was found that the average loss coefficient was low, owing to the fact that the flow over the airfoils was well behaved. The loss coefficient also …
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One-Dimensional Dynamic Wake Response in an Isolated Rotor due to Inlet Total Pressure Distortion
… investigation of the wake of a low-speed axial-flow compressor rotor was conducted with and without the presence of steady inlet total pressure distortions. The steady three-dimensional rotor inlet flow was obtained by a five-hole pneumatic pressure probe, while the one-dimensional rotor exit …
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An Experimental and Analytical Investigation of Dynamic Flow Response of a Fan Rotor with Distorted Inlet Flow
… gain insight and ultimately predict the dynamic flow response of a fan rotor with inlet flow distortion. Rotor exit total pressure circumferential profiles were accurately predicted using frequency response functions derived from experimental rotor response data. Using these predicted profiles, …
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Particle Size, Gas Temperature, and Impingement Cooling Effects on High Pressure Turbine Deposition in Land Based Gas Turbines from Various Synfuels
… ash particles were accelerated to a combustor exit flow Mach number of 0.25 before impinging on a thermal barrier coated (TBC) target button at 1183°C. Particle size was found to have a significant effect on capture efficiency with larger particles causing considerable TBC spallation during a …
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Aero-propulsive characteristics of an overwing distributed electric propulsion system with vectored thrust
… thrust angles achieved by deflecting the fan exit flow direction. The DEP system was comprised of five electric fans mounted on the upper surface of the airfoil trailing edge. The electric ducted fans were sized with a diameter-to-chord ratio of 19.7%, and five fans were installed to cover …
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Aerodynamic study of a small, ducted VTOL aerial vehicle
… smaller diffusers, contrary to theory. Reverse flow within the core appears to disrupt uniform exit flow and yields a conically divergent turbulent wake. Results of this study will be used in the redesign of a duct core fairing, which will act to control the airflow and reduce the tendency for …
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Reynolds number effects on the aerodynamics of compact axial compressors
… limited by increased viscous losses and reduced flow turning at low Reynolds numbers ($Re$). In domestic appliance compressors, $Re$ is typically in the range $10^4$ - $10^5$. Although the aerodynamics of isolated aerofoils operating at these $Re$ have been studied extensively, the flow fields …
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