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 6 of 6 for “"nozzle-lip"”.
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Modelling of satellite control thruster plumes
… DSMC technique was also used to calculate the nozzle lip and backflow expansion regions of the same hydrazine thruster. A significant degree of backflow was found with flow angles of up to 140º. The sensitivity of the calculations to the conditions initially assumed were assessed and found to …
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Acoustic Resonances in Ducted Jet Systems
… depends upon acoustic fluctuations reaching the nozzle lip and exciting the shear layers of the jet, the growth of the shear layer perturbations until vortices are rolled up and convected downstream, the interaction of the vortices with the shock-cell structure releasing another pressure pulse …
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Active Control of Coherent Structures in an Axisymmetric Jet
… utilizes a unsteady microjet actuator on the nozzle lip in the downstream direction to produce a desired effect on the jet flow-field dynamics thereby directly affecting the source source. In contrast to the passive approach, the proposed open-loop control design will utilize a local flow …
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Aeroacoustics Applications to Jets and Rotors
… utilizing unsteady microjet actuation at the nozzle lip is explored to disrupt the formation of large-scale turbulent structures responsible for noise generation. High-fidelity simulations capture the unsteady flow dynamics and acoustic propagation, revealing how microjets alter the dominant …
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Very near-nozzle shear-layer turbulence and jet noise
Jet noise is sensitive to nozzle configurations and most current aircraft operate close to Federal Aviation Administration (FAA) and other noise restriction levels, with more stringent requirements expected in the future. At the current time, however, prediction capabilities lack the fidelity to …
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The Effects of Active Flow Control on High-Speed Jet Flow Physics and Noise
… of a highly subsonic, axisymmetric jet with a nozzle diameter of two inches (50.8 mm), is probed through the implementation of two-component particle image velocimetry (PIV) in the streamwise plane, along the jet's centerline. These measurements are coupled with simultaneously sampled near and …