Experimental investigation of nozzle spacing effects on characteristics of round twin free jets

Simple item page
dc.contributor.authorLaban, Andrew
dc.contributor.examiningcommitteeOrmiston, Scott (Mechanical Engineering) Maghoul, Pooneh (Civil Engineering)en_US
dc.contributor.guestmembersKoupriyanov, Mike (Price Industries)en_US
dc.contributor.supervisorTachie, Mark (Mechanical Engineering)en_US
dc.date.accessioned2018-09-17T19:17:12Z
dc.date.available2018-09-17T19:17:12Z
dc.date.issued2018-05-29en_US
dc.date.submitted2018-06-04T03:46:05Zen
dc.degree.disciplineMechanical Engineeringen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractThe objective of this research is to investigate the effects of nozzle spacing on the mean velocity and higher order turbulent statistics of free round twin jets produced from sharp contraction nozzles. The experiments were performed in an air chamber for four nozzle spacing ratios, S/d = 2.8, 4.1, 5.5 and 7.1 and at a fixed Reynolds number of 10,000. A planar particle image velocimetry system was used to conduct the velocity measurements. The results show that downstream of the potential core, a reduction in spacing ratio leads to an earlier and more intense interaction between the jets, indicated by enhanced half-velocity width spread rate in the inner shear layers and a significant rise of turbulent intensities and vorticity thickness along the symmetry plane. A reduction in spacing ratio, however, diminishes the ambient fluid entrainment along the inner shear layers leading to reduced core jet velocity decay rate. A closer proximity of the jets also leads to the suppression of Reynolds stresses in the inner shear layers but not in the outer shear layers, suggesting that there exists no significant communication between the inner and outer shear layers. The Reynolds stress ratios along the jet centerline reveals the highest anisotropy in the potential core region. Skewness and flatness factors are used to examine the asymmetry and intermittency of the velocity fluctuations, while two-point correlation analysis is employed to investigate the effects of nozzle spacing ratio on the spatial coherence of large-scale vortical structures.en_US
dc.description.noteOctober 2018en_US
dc.identifier.urihttp://hdl.handle.net/1993/33415
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.subjectTurbulence, Particle image velocimetry, Turbulent jets, Reynolds stresses, Integral length scalesen_US
dc.titleExperimental investigation of nozzle spacing effects on characteristics of round twin free jetsen_US
dc.typemaster thesisen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
laban_andrew.pdf
Size:
2.83 MB
Format:
Adobe Portable Document Format
Description:
Thesis doc after implementing committe revisions
Download
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
2.2 KB
Format:
Item-specific license agreed to upon submission
Description:
Download
Collections
FGS - Electronic Theses and Practica