Mixing enhancement in supersonic jet flow via air tabs

Research in supersonic jet mixing enhancement has seen a revival with the increased awareness of environmental impacts aircrafts have as well as with the advent of the scramjet. Passive and active means or mixing enhancement haven been researched into, and while delta/solid tabs have proved to be th...

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Main Author: Ong, Lawrance Yin Keat.
Other Authors: Yu, Simon Ching Man
Format: Final Year Project
Language:English
Published: 2009
Subjects:
Online Access:http://hdl.handle.net/10356/15428
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-154282023-03-04T18:39:14Z Mixing enhancement in supersonic jet flow via air tabs Ong, Lawrance Yin Keat. Yu, Simon Ching Man School of Mechanical and Aerospace Engineering Temasek Laboratories DRNTU::Engineering::Aeronautical engineering::Aerodynamics Research in supersonic jet mixing enhancement has seen a revival with the increased awareness of environmental impacts aircrafts have as well as with the advent of the scramjet. Passive and active means or mixing enhancement haven been researched into, and while delta/solid tabs have proved to be the best in terms of entrainment, air tabs have shown to be able to reproduce the results obtained by the delta/solid tab in subsonic regimes. In this paper, air tabs would be compared to a delta/solid tab in a supersonic regime. The primary jet would be at M=1.3 while the secondary jet would be at M=1.0. Modifications were done to the air tabs in an effort to enhance mixing. The secondary injectors would be tilted at an angle (15 and 30 degrees) to introduce a swirl to the primary jet, which in theory would improve mixing. By tilting the secondary injectors, the secondary jets would have a moment arm with respect to the primary jet as it enters the primary jet. This would disrupt the primary jet flow, causing it to have a radial velocity component, which would result in swirling of the primary jet. Measurements for centreline velocity, cross sectional velocity profile are taken using pitot tubes connected to transducers and the mass flux at selected distanced are obtained. The results show that in the supersonic regime, the delta/solid tab reigns supreme. Although bifurcation of the primary jet can be observed for all tabs at nearfield, they did not persist downstream for the modified air tabs. This is attributed to the angled entry of the secondary jet into the primary jet. As such, the entrainment rate was not enhanced with the use of the modified air tabs. Bachelor of Engineering (Aerospace Engineering) 2009-04-29T07:58:48Z 2009-04-29T07:58:48Z 2009 2009 Final Year Project (FYP) http://hdl.handle.net/10356/15428 en Nanyang Technological University 79 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Aeronautical engineering::Aerodynamics
spellingShingle DRNTU::Engineering::Aeronautical engineering::Aerodynamics
Ong, Lawrance Yin Keat.
Mixing enhancement in supersonic jet flow via air tabs
description Research in supersonic jet mixing enhancement has seen a revival with the increased awareness of environmental impacts aircrafts have as well as with the advent of the scramjet. Passive and active means or mixing enhancement haven been researched into, and while delta/solid tabs have proved to be the best in terms of entrainment, air tabs have shown to be able to reproduce the results obtained by the delta/solid tab in subsonic regimes. In this paper, air tabs would be compared to a delta/solid tab in a supersonic regime. The primary jet would be at M=1.3 while the secondary jet would be at M=1.0. Modifications were done to the air tabs in an effort to enhance mixing. The secondary injectors would be tilted at an angle (15 and 30 degrees) to introduce a swirl to the primary jet, which in theory would improve mixing. By tilting the secondary injectors, the secondary jets would have a moment arm with respect to the primary jet as it enters the primary jet. This would disrupt the primary jet flow, causing it to have a radial velocity component, which would result in swirling of the primary jet. Measurements for centreline velocity, cross sectional velocity profile are taken using pitot tubes connected to transducers and the mass flux at selected distanced are obtained. The results show that in the supersonic regime, the delta/solid tab reigns supreme. Although bifurcation of the primary jet can be observed for all tabs at nearfield, they did not persist downstream for the modified air tabs. This is attributed to the angled entry of the secondary jet into the primary jet. As such, the entrainment rate was not enhanced with the use of the modified air tabs.
author2 Yu, Simon Ching Man
author_facet Yu, Simon Ching Man
Ong, Lawrance Yin Keat.
format Final Year Project
author Ong, Lawrance Yin Keat.
author_sort Ong, Lawrance Yin Keat.
title Mixing enhancement in supersonic jet flow via air tabs
title_short Mixing enhancement in supersonic jet flow via air tabs
title_full Mixing enhancement in supersonic jet flow via air tabs
title_fullStr Mixing enhancement in supersonic jet flow via air tabs
title_full_unstemmed Mixing enhancement in supersonic jet flow via air tabs
title_sort mixing enhancement in supersonic jet flow via air tabs
publishDate 2009
url http://hdl.handle.net/10356/15428
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