Full Text Available

Access Repository
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Cover Image

Supersonic wind-tunnel : nozzle design and control system analysis

Symmetrical two-dimensional nozzles were designed for the supersonic wind-tunnel, in the Department of Mechanical Engineering, using both analytical and semigraphical methods obtained from the theory of Characteristics. These nozzles, designed for an optimum running time of 30 seconds, at a Mach num...

Full description

Saved in:
Main Author: Cox, Riordan Howard Tesling
Other Authors: Gryzagoridis, Jasson
Format: Thesis
Language:English
Published: Department of Mechanical Engineering 2016
Subjects:
Mechanical Engineering
Tags: Add Tag
No Tags, Be the first to tag this record!
_version_ 1867613165896859648
access_status_str Open Access
author Cox, Riordan Howard Tesling
author2 Gryzagoridis, Jasson
author_browse Cox, Riordan Howard Tesling
Gryzagoridis, Jasson
author_facet Gryzagoridis, Jasson
Cox, Riordan Howard Tesling
author_sort Cox, Riordan Howard Tesling
collection Thesis
description Symmetrical two-dimensional nozzles were designed for the supersonic wind-tunnel, in the Department of Mechanical Engineering, using both analytical and semigraphical methods obtained from the theory of Characteristics. These nozzles, designed for an optimum running time of 30 seconds, at a Mach number of 2,35. Boundary layer growth was considered by displacing the nozzle contours outwards by the equivalent displacement thickness, while keeping the vertical tunnel side walls parallel. The five pitot probe calibration results, taken through the central vertical plane in the tunnel test-section, showed Mach number standard deviations about the mean of 0,638% and 1,004% for the analytical and semi-graphical design respectively. These results compare ·very favourably with those of other wind- tunnels. Without pressure recovery the critical flow pressure ratio through the tunnel for Mach 2,35 nozzles, is 2,53. Therefore it may be shown that the subsonic diffuser, and the silencer incorporated into it, is about 75% efficient. The analysis and modification to the existing settling chamber control valve yielded improvements in performance. 1. The maximum fluctuation in settling chamber pressure was kept to within 5,5% for most operating conditions. 2. Critical valve response was achieved by applying a suitable bypass orifice to the damping cylinder - The valve settled down within one second after flow had been initiated. A proposed variable symmetrical nozzle was examined for the feasibility of its application to the existing supersonic wind-tunnel.
format Thesis
id oai:open.uct.ac.za:11427/17711
institution University of Cape Town (South Africa)
language eng
last_indexed 2026-06-10T12:31:48.735Z
license_str Not specified — see source repository
provenance_str_mv Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository
publishDate 2016
publishDateRange 2016
publishDateSort 2016
publisher Department of Mechanical Engineering
publisherStr Department of Mechanical Engineering
record_format dspace
source_str UCTD — University of Cape Town Open Access Repository
spelling oai:open.uct.ac.za:11427/17711 Supersonic wind-tunnel : nozzle design and control system analysis Cox, Riordan Howard Tesling Gryzagoridis, Jasson Mechanical Engineering Symmetrical two-dimensional nozzles were designed for the supersonic wind-tunnel, in the Department of Mechanical Engineering, using both analytical and semigraphical methods obtained from the theory of Characteristics. These nozzles, designed for an optimum running time of 30 seconds, at a Mach number of 2,35. Boundary layer growth was considered by displacing the nozzle contours outwards by the equivalent displacement thickness, while keeping the vertical tunnel side walls parallel. The five pitot probe calibration results, taken through the central vertical plane in the tunnel test-section, showed Mach number standard deviations about the mean of 0,638% and 1,004% for the analytical and semi-graphical design respectively. These results compare ·very favourably with those of other wind- tunnels. Without pressure recovery the critical flow pressure ratio through the tunnel for Mach 2,35 nozzles, is 2,53. Therefore it may be shown that the subsonic diffuser, and the silencer incorporated into it, is about 75% efficient. The analysis and modification to the existing settling chamber control valve yielded improvements in performance. 1. The maximum fluctuation in settling chamber pressure was kept to within 5,5% for most operating conditions. 2. Critical valve response was achieved by applying a suitable bypass orifice to the damping cylinder - The valve settled down within one second after flow had been initiated. A proposed variable symmetrical nozzle was examined for the feasibility of its application to the existing supersonic wind-tunnel. 2016-03-14T07:16:58Z 2016-03-14T07:16:58Z 1973 Master Thesis Masters MSc (Eng) http://hdl.handle.net/11427/17711 eng application/pdf Department of Mechanical Engineering Faculty of Engineering and the Built Environment University of Cape Town
spellingShingle Mechanical Engineering
Cox, Riordan Howard Tesling
Supersonic wind-tunnel : nozzle design and control system analysis
thesis_degree_str Master's
title Supersonic wind-tunnel : nozzle design and control system analysis
title_full Supersonic wind-tunnel : nozzle design and control system analysis
title_fullStr Supersonic wind-tunnel : nozzle design and control system analysis
title_full_unstemmed Supersonic wind-tunnel : nozzle design and control system analysis
title_short Supersonic wind-tunnel : nozzle design and control system analysis
title_sort supersonic wind tunnel nozzle design and control system analysis
topic Mechanical Engineering
url http://hdl.handle.net/11427/17711
work_keys_str_mv AT coxriordanhowardtesling supersonicwindtunnelnozzledesignandcontrolsystemanalysis

Similar Items