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Showing 1 to 16 of 16 for “"axisymmetric jet"”.
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Active Control of Coherent Structures in an Axisymmetric Jet
… is to develop high-fidelity simulation model for jet noise control predictions and quantify the sound reduction when an external source frequency mode excitation is imposed on the jet flow. Whereas passive approaches using mixing devices, such as chevrons, have been shown to reduce low-frequency …
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An Experimental Investigation Into the Effect of Plasma on the Flow Features of an Axisymmetric Jet
… the mean and turbulent velocity profiles of the jets tested - allowing the jet core to penetrate further downstream. Large scale structure tracking indicated an increase in convective velocity of up to 5%. Heating of the shear layer by the plasma field was believed to bias the convective velocity …
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Chaos Control of an Open Shear Flow: A Novel Control Strategy and its Experimental Demonstration in an Axisymmetric Jet
… dynamics and turbulence in the near field of an axisymmetric jet is presented. Experiments were performed in an initially laminar circular jet, housed in a low-noise anechoic chamber. Periodic flow states involving various sequences of vortex ring formation and their pairings were achieved using …
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Hydrodynamic Stability of Periodically Unsteady Axisymmetric and Swirling Jets
Axisymmetric and swirling jets are generic flows that characterize many natural and man-made flows. These include cylindrical shear layer/mixing layer flows, aircraft jets and wakes, shedding of leading edge and wing tip vortices, tornadoes, astrophysical plasma flows and flows in mechanical …
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Assessment of Turbulence Modelling for Compressibility Effects in Ejector Ramjet Applications
… effects for a confined supersonic jet, a key component of the Atlantis Intake System ejector ramjet. The third-party OpenFOAM compressible flow solver, pimpleCentralFOAM, is used to simulate a Mach 1.25 axisymmetric jet discharging inside a mixing tube and is compared against PIV …
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Planar Laser Induced Fluorescence Experiments and Modeling Study of Jets in Crossflow at Various Injection Angles
… was applied to measure the scalar fields of an axisymmetric freejet and an inclined jet-in-crossflow as applicable to film cooling. From the scalar fields, jet-mixing and trajectory characteristics were obtained. In order to validate the technique, the canonical example of a nonreacting freejet …
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Turbulent Molecular Mixing in Gaseous Free Shear Flows
… Vortex mixing in the near field of an axisymmetric jet (ReD = 2300) is studied by using an acoustic pulse to obtain repeatable vortex formation and merging events. Results indicate that the mixing process is initially slow within the laminar vortex rollers, but a dramatic increase in …
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Measurements of the length of the zone of flow establishment in a jet using a Laser Doppler Anemometer
… in a submerged, turbulent, buoyant, axisymmetric jet issuing into a quiescent ambient fluid was investigated using a Laser Doppler Anemometer and microthermocouple probe. Also, velocity and temperature profiles were measured through various cross-sections of the jet; A 3-dimensional …
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Prediction of tool temperature during machining of Ti-6Al-4V alloy with atomization-based cutting fluid spray system
… in a high-velocity gas flow to form a focused axisymmetric jet of droplets. During machining, this jet is able to penetrate the small region of the tool-chip interface helping in lubrication and cooling of the interface. The advantage of the ACF spray system is that it requires very small …
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Studies of Turbulent Round Jets Through Experimentation, Simulation, and Modeling
… studies the physics of the turbulent round jet. In particular, it focuses on three different problems that have the turbulent round jet as their base flow. The first part of this thesis examines a compressible turbulent round jet at its sonic condition. We investigate the shearing effect …
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Deposition of Newtonian Particles Entrained in a Turbulent Axisymmetric Free Jet
… has been the study of particles entrained in axisymmetric air jets. An experimental rig was designed and built to study entrainment properties and deposition of Newtonian particles, after injection into a turbulent axisymmetric free air jet. Newtonian spherical particles, ranging from 1mm to …
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Investigating the Structures of Turbulence in a Multi-stream, Rectangular, Supersonic Jet
… supersonic flight exacerbate the preexisting jet noise problem, which has troubled the engineering community for nearly 65 years. Even in the simplest flows, the full consequences of turbulence, e.g. noise production, are not fully understood. For composite flows, the fluid mechanics and …
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The Effects of Active Flow Control on High-Speed Jet Flow Physics and Noise
… generation of a fully turbulent, compressible jet flow within a large scale anechoic chamber. The investigations are aimed at understanding the complex nature of the jet flow field in an effort to reduce the far-field noise through active flow control and novel reduced-order modeling. The flow …
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Modern Methods in Machine Learning as Applied to the Study of a Complex Supersonic Jet Flow
… multiple high-velocity streams issuing from non-axisymmetric exit areas and can be optimized for airframe integration and stealth performance. The associated turbulent jet physics and the aeroacoustic phenomena have been studied thoroughly over the past 80 years; however, the complex non-linear …
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The fluid-structure interaction of an axisymmetric underexpanded jet flowing across an adjacent compliant surface
… little-explored problem of an underexpanded axisymmetric jet flowing across an adjacent parallel surface, in both rigid-surface and compliant-surface configurations. To date, the vast majority of the literature for both the rigid- and compliant-surface cases has been generated by the …
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Flow physics and air interactions of magnetically driven plasma discharges
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms