AN EXPERIMENTAL STUDY OF SINGLE AND TWIN TRANSVERSE JETS IN SUBSONIC CROSSFLOW

AN EXPERIMENTAL STUDY OF SINGLE AND TWIN TRANSVERSE JETS IN SUBSONIC CROSSFLOW

Bibliographic Details
Main Author: IBRAHIM, IRENE
Language:English
Published: University of Cincinnati / OhioLINK 2006
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=ucin1141421705
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-ucin11414217052021-08-03T06:10:56Z AN EXPERIMENTAL STUDY OF SINGLE AND TWIN TRANSVERSE JETS IN SUBSONIC CROSSFLOW IBRAHIM, IRENE This Masters research is broadly divided into two sections: the first is a study of single jets in crossflow and the second is a study of a twin jet configuration in crossflow. The single jet tests are further divided into those conducted with circular nozzle injectors and those with noncircular nozzle injectors. The circular nozzle injectors were tested in confined and unconfined flow conditions. Also, the diameter and the blowing ratio for the circular nozzle injectors, in confined and unconfined flow, were manipulated to study their effects. The noncircular nozzle injectors consisted of a triangular and a bluff geometry, each aligned in two different orientations with respect to the crossflow, which were studied and compared to the baseline circular nozzle at the same conditions. In the second main study on twin jets, the interaction between the two jets was investigated and the spacing between the injectors as well as the blowing ratio were manipulated to test their effects. All experimental work is done using the Particle Image Velocimetry (PIV) flow diagnostics in subsonic windtunnels at various UC facilities. The behavior of the jet in crossflow in the single jet tests was characterized using the following parameters: penetration and trajectory, decay of mean centerline velocity, spreading rates of the windward and leeward jet boundaries, formation of the region of reverse flow, an approximation of the mass entrainment characteristics based on the trajectory of the jet, and an analysis of the turbulent kinetic energy of the flowfield as generated by the behavior of the jet. It was found that the penetration and the size of the reverse flow region grow with increasing blowing ratios. These effects are further magnified for increasing jet diameter. For the noncircular injector tests, additional analysis was performed pertaining to large scale structures as influenced by the properties of the boundary layers shed from the various walls of the injector nozzle. This incorporated an investigation of the vortices generated on the surfaces of the jet as well as in the flowfield. It was found here that jets injected from high aspect ratio nozzle geometries penetrate the least while those with low aspect ratios penetrate the highest into the crossflow. The curvature of the nozzle walls also has an effect on the outcome of penetration and other parameters. For twin jet tests, it was found that the presence of a second jet upstream of another jet generates a shielding effect that enhances the penetration of the rear jet or shielded jet. This shielding effect also results in a large region of reverse flow forming between the two jets compared to that formed leeward of a single jet at the same conditions. Also, the reverse flow region of leeward of the rear jet is considerably reduced due to the acceleration of the crossflow fluid as it maneuvers about the extra blockage of the front jet. 2006-10-02 English text University of Cincinnati / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ucin1141421705 http://rave.ohiolink.edu/etdc/view?acc_num=ucin1141421705 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
author IBRAHIM, IRENE
spellingShingle IBRAHIM, IRENE
AN EXPERIMENTAL STUDY OF SINGLE AND TWIN TRANSVERSE JETS IN SUBSONIC CROSSFLOW
author_facet IBRAHIM, IRENE
author_sort IBRAHIM, IRENE
title AN EXPERIMENTAL STUDY OF SINGLE AND TWIN TRANSVERSE JETS IN SUBSONIC CROSSFLOW
title_short AN EXPERIMENTAL STUDY OF SINGLE AND TWIN TRANSVERSE JETS IN SUBSONIC CROSSFLOW
title_full AN EXPERIMENTAL STUDY OF SINGLE AND TWIN TRANSVERSE JETS IN SUBSONIC CROSSFLOW
title_fullStr AN EXPERIMENTAL STUDY OF SINGLE AND TWIN TRANSVERSE JETS IN SUBSONIC CROSSFLOW
title_full_unstemmed AN EXPERIMENTAL STUDY OF SINGLE AND TWIN TRANSVERSE JETS IN SUBSONIC CROSSFLOW
title_sort experimental study of single and twin transverse jets in subsonic crossflow
publisher University of Cincinnati / OhioLINK
publishDate 2006
url http://rave.ohiolink.edu/etdc/view?acc_num=ucin1141421705
work_keys_str_mv AT ibrahimirene anexperimentalstudyofsingleandtwintransversejetsinsubsoniccrossflow
AT ibrahimirene experimentalstudyofsingleandtwintransversejetsinsubsoniccrossflow
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