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 21 for “"Hot Flow"”.
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Hot flow testing of multiple nozzle exhaust eductor systems.
Hot flow model tests of multiple nozzle gas turbine exhaust eductor systems were conducted to evaluate the temperature effects of several eductor design modifications. A one-dimensional analysis of a simple eductor system based on conservation of momentum for an incompressible gas was used in …
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Time-dependent Accretion Flows onto Black Holes
… can be remedied by assuming that the accretion flow consists not only of the cold standard disk, but also of a hot optically thin plasma in the immediate vicinity. This hot flow cools through advection rather than through radiation. This work addresses the question whether an inner hot optically …
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Combustion gas generator for gas turbine exhaust systems modeling.
… developed using cool air as the primary flow medium. A secondary air flow metering box was designed and partially completed for the determination of eductor pumping characteristics during hot flow operations.
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Acoustical behavior of a turbulent, ducted, premixed, hydrogen- flame burner
… agrees with a correlation in the literature for hot flow leaving a duct.
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Hydrodynamics and Mass Transfer in Bubble Columns
… the effect of column size and gas and liquid flow rates on column hydrodynamics and reactor performance. Among these approaches, phenomenological models based on either single-class or multi-class bubbles that were validated on cold flow systems have been successful in predicting the residence …
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An experimental simulation of liquid fuel injection into a heated subsonic gas crossflow
In this investigation, an approach to studying hot-flow subsonic cross-stream fuel injection problems with a less complex and less costly cold-flow facility was developed and implemented. An actual ramjet combustion chamber fuel injection problem was proposed where ambient temperature fuel was …
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The effects of temperature distortion on aerodynamics and low engine order forced response in axial turbines
The flow entering a high-pressure turbine in a gas turbine engine is characterised by a loss of symmetry due to temperature distortions in both radial and circumferential directions, known as hot streaks. In industrial simulations it is common practice to assume uniform inlet temperature conditions …
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A Parallel Solution-Adaptive Method for Turbulent Non-Premixed Combusting Flows
… turbulent non-premixed compressible combusting flows for both two and three space dimensions. The parallel solution-adaptive algorithm solves the system of partial-differential equations governing turbulent compressible flows of reactive thermally perfect gaseous mixtures using a fully coupled …
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Analysis of mixing and thrust diagnostics for shock tunnel hot nozzle testing
Transient testing of hot engine exhaust nozzle flows is being pursued to enable cost and time savings of one to two orders of magnitude over steady-state hot-flow testing. This thesis presents the design and assessment of mixing and thrust measurement systems for use with a shock tunnel for these …
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CFD Simulations of Chemical Looping Combustion in a Packed Bed and a Bubbling Bed Fuel Reactor
… of Galucci; the simulations are performed for hot flow with chemical reactions simulating the exact experimental conditions. The previous simulations for this case were conducted for cold flow without chemical reactions. Simulations are performed for the entire sixty minutes of the experimental …
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Gas- and solid-mixing behavior in a vibrated-bed microreactor with rapid switching of catalyst between gas atmospheres
A cold-flow vibated-bed microreactor system, operating at the room temperature and atmospheric pressure, was built and tested. The purpose of this microreactor was to simulate gas- and solid-mixing in a hot-flow microreactor system. The latter is being developed to study carbon deposition rates for …
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Design and Analysis of a Reusable N2O-Cooled Aerospike Nozzle for Labscale Hybrid Rocket Motor Testing
… the results of previous research involving cold-flow testing of annular aerospike nozzles and hot-flow testing of oxidizer-cooled converging-diverging nozzles. In the design, nitrous oxide is routed to the aerospike through a tube that runs up the middle of the combustion chamber. The solid fuel …
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Technique for Measuring the Coefficient of Restitution for Microparticle Sand Impacts at High Temperature for Turbomachinery Applications
… In the second study, ARD is injected into a hot flow field at temperatures of 533oK, 866oK, and 1073oK to measure the effects of high temperature on particle rebound. The results are compared with baseline measurements at ambient temperature made in the VT Aerothermal Rig, as well as …
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Simulation of Flow in a Solid Fuel Ramjet Cavity
Cold flow inside a Solid Fueled Ramjet (SFRJ) is simulated using large eddy simulations (LES). A finite element method using a Discontinuous Galerkin bases has been implemented in the open-sourced multi-physics software SU2. Novel LES formulations of the fuel-gas boundary conditions and the heat …
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A Study of Direct Measuring Skin Friction Gages for High Enthalpy Flow Applications
… in three-dimensional, high-speed, high-enthalpy flows. Design conditions required favorable gage performance in the Arc-Heated Facilities at Arnold Engineering Development Center. Flow conditions are expected to be at Mach 3.4, with convective heat properties of h= 1,500 W/(m°·K) (264 …
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Development of a high power density combustion system for a silicon micro gas turbine engine
… is the first demonstration of the complete hot flow path of a multi-level microengine. The 0.195 cm 3 combustion chamber has been tested for several tens of hours and is shown to sustain stable hydrogen combustion with exit gas temperatures above 1600K and combustor efficiencies as high as …
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Aeroacoustic measurement and analysis of transient supersonic hot nozzle flows
… 10-20 millisecond, under expanded supersonic hot air jets from a series of scaled nozzles. The primary purpose of the facility is to investigate noise suppressor nozzle concepts relevant to supersonic civil transport aircraft applications. The shock tube has many strengths; it is mechanically …
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Development and Testing of an Integrated Liquid-Fuel-Injector/Plasma-Igniter for Scramjets
… injector/plasma igniter was tested in cold flow using the Virginia Tech supersonic wind tunnel at Mach 2.4. The liquid fuel (kerosene) injector is flush wall mounted and consists of a 2 hole aeroramp array of impinging jets that are oriented in a manner to improve mixing and atomization of …
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Skin Friction Sensor Design Methodology and Validation for High-Speed, High-Enthalpy Flow Applications
… favorably in high-speed, high-enthalpy flow conditions, such as that found in atmospheric re-entry vehicles, scramjets, jet engines, material testing, and industrial processes. Fully understanding and optimizing these complex flows requires an understanding of aerodynamic properties at …
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Radio frequency plasma synthesis of ultrafine titanium carbide powders
… equipment. Feeding cohesive powder at low flow rates with little flow rate variability is recognised as an extremely difficult task. Perhaps as expected, the vibrated elutriated fluidised bed (VEFB) powder feeder that was developed only partially met its design specification as it fed TiO2 …
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