Browsing Master's Theses by Subjects
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Study of Swirling Jets on an Impingement SurfaceThere has been extensive research performed on the turbulent jet stream flow including unimpeded and impinged flow. Vortex jet streams however has not been studied in as great of detail. Some researchers have focused on the development of vortex flow as well as axial and azimuthal velocity profiles generated from these jet streams. The need for better control over aircraft carries and decrease the wait time between landing aircraft at airports has driven a need for further research into these vortex flows. If an impingement surface is introduced into these example environments at which angle should it be positioned to quickly dissipate the flow? This research will validate a blower jet stream system, develop vortex nozzles, validate the tripped nozzle and characterize the vortex flow on an impingement surface. To start, an existing converging/diverging blower motor system was utilized for all the experiments performed. A tripped nozzle configuration was used to confirm that the results generated matched those of pervious experiment published. This confirmed not only the physical setup but also the data acquisition methods. Next varying nozzle configuration were designed, printed and tested to determine their functionality. The results confirmed that the nozzles generated increasing levels of vortex flow ranging from low, medium and high azimuthal axis components. After all the nozzles were characterized in the unimpeded configuration the impingement wall was introduced. The tripped nozzle was used as a baseline for this setup since the results for this configuration are well defined. Next each of the vortex nozzles went through the same series of tests. This involved varying speeds of the jet flow as well as three different impingement wall angles. The results showed that at low swirl numbers the jet stream profile match the tripped nozzle setup closely. As the swirl number increase the flow became harder to dissipate. This resulted in the wall needing to be positioned at a steeper angle. Another interesting observation was at the higher vortex flows there was as axial vortex generated that was not seen in any of the other setups. Overall, it was determine that vortex flow required a near vertical wall to effectively impede the flow.