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.
Results
Showing 1 to 16 of 16 for “"Jet Interaction"”.
-
Innovative Transverse Jet Interaction Arrangements in Supersonic Crossflow
… on the premise that adding an array of auxiliary jets behind a main jet injector would alleviate the large region of low pressure typically found downstream of a normal, sonic injector in supersonic flow and also possibly increase in intensity of the upstream high-pressure region. The secondary …
-
Numerical Studies of the Jet Interaction Flowfield with a Main Jet and an Array of Smaller Jets
A numerical study of a proposed innovative jet interaction configuration is presented. This work aimed at improving present-day jet interaction configurations in their applications as control thrusters on hypersonic vehicles. Jet thrusters are a useful control system for fast-moving vehicles flying …
-
A numerical study of eddy interactions with a barotropic oceanic jet
… downstream advection of a ring in contact with a jet, and (4) vorticity advection associated with the jet and eddy interaction. Utilizing a two layer, nonlinear primitive equation model, an examination of eddy movement is conducted, with focus on eddy/jet interaction. A series of numerical …
-
Delivery of macromolecule therapeutics via jetting in the gastrointestinal tract
… by mouth. To that end, needleless delivery, or jetting, has been identified as a promising approach. This work describes mechanistic modeling of jets, an empirical evaluation of jet interaction with gastrointestinal tissues, a millimeter-scale jetting device capable of autonomous drug delivery, …
-
Reaction Control Jet Actuators for Air-Breathing Hypersonic Vehicles
… high frequency actuators. Reaction control (RC) jets are an attractive solution, as they are commonly used to supplement aerodynamic control surfaces for exo-atmospheric control of hypersonic vehicles, and can operate at high frequency. If RC jets are operated within the atmosphere, an …
-
The Effects of Vortex Generator Jet Frequency, Duty Cycle, and Phase on Separation Bubble Dynamics
Vortex generator jets (VGJs) have proven to be effective in minimizing the separation losses on low-pressure turbine blades at low Reynolds numbers. Experimental data collected using phase-locked particle image velocimetry and substantiated with a hot-film anemometer were used to answer fundamental …
-
A Five-Zone Model for Direct Injection Diesel Combustion
… structure of direct injection diesel fuel jets as well as empirical correlations predicting jet development and structure. This information was used to create a diesel cycle simulation model using C language including compression, fuel injection and combustion, and expansion processes. …
-
In-Cylinder Soot Oxidation in an Optically Accessible Automotive Diesel Engine
… is how fuel injection conditions as well as jet-swirl and jet-jet interactions impact soot oxidation process. In this regard, various optical/laser-based imaging diagnostics were performed to unveil the development of high-temperature reaction and soot in small-bore optical diesel engines, …
-
Flow and Thermal Field Measurements in a Combustor Simulator Relevant to a Gas Turbine Aero-Engine
… the combustor. Shear layers between the dilution jets and the mainstream, as well as combustor liner film-cooling interactions create a complex mean flow field within the combustor, which is not easy to model. A completely uniform temperature and velocity profile at the combustor exit is desirable …
-
Active Flow Control of a Boundary Layer Ingesting Serpentine Diffuser
… computationally using a boundary condition jet modeling method, and tested in an ejector-driven wind tunnel facility. This facility is capable of simulating the high-altitude, high subsonic Mach number conditions representative of BWB cruise conditions, specifically a cruise Mach number of …
-
Investigations of Injectors for Scramjet Engines
… average Reynolds number 5.77 e+7 per meter at a jet to freestream momentum flux ratio of 2.1. Sampling probe measurements were utilized to determine the local helium concentration. Pitot and cone-static pressure probes and a diffuser thermocouple probe were employed to document the flow. The main …
-
Navier-Stokes prediction of the three dimensional flowfield of jets in a crossflow using the finite element method
… for the effect of arbitrary cross-section of the jets injected from a various nozzle configurations into a uniform crossflow. The model is implemented as a module of a general purpose finite-element computer code. The finite-element procedures used here follow from a Galerkin type variational …
-
Computational Studies of Penetration and Mixing for Complex Jet Injectors to Aid in Design of Hypersonic Systems
A computational study of sonic light-gas jet injection into a supersonic cross flow was conducted. The scope of the numerical analysis encompassed many studies that affect how the flow-field is numerically modeled and the behavior, specifically mixing, of the flow-field itself. A single, round …
-
Electron acceleration at localized wave structures in the solar corona
… I. Electron acceleration due to the solar jet interaction with the background coronal plasma (the jet--plasma interaction) A jet is formed when the newly reconnected and highly curved magnetic field lines are relaxed by shooting plasma away from the reconnection site. Such jets, as observed …
-
Morphodynamics of Ebb-Tidal Deltas
… delta in the field. A semi-analytical ebb-jet model, which was coupled to an exploratory morphological model, was developed and used to explore the interactions between tidal currents, waves, and morphology, and to test the sensitivity of morphological development and response to changes in …