Thesis (MEng (Mechanical Engineering))--University of Stellenbosch, 1994. / 213 leaves printed on single pages, preliminary pages i-xix and numbered pages 1-116. Includes bibliography, list of tables, list of figures and nomenclature. / Digitized at 600 dpi grayscale to pdf format (OCR), using a Bizhub 250 Konica Minolta Scanner. / ENGLISH ABSTRACT: A design methodology for low pressure rise, rotor only, ducted
axial flow fans is formulated, implemented and validated using
the operating point specifications of a 1/6th scale model fan
as a reference. Two experimental fans are designed by means of
the design procedure and tested in accordance with British
Standards 848, Type A.
The design procedure makes use of the simple radial equilibrium
equations, embodied in a suite of computer programs. The
experimental fans have the same hub-tip ratio and vortex distribution,
but differ in the profile section used. The first
design utilises the well known Clark-Y aerofoil profile whilst
the second takes advantage of the high lift characteristics of
the more modern NASA LS series.
The characteristics of the two designs are measured over the
entire operating envelope and compared to the reference fan
from which the utility and accuracy of the design procedure is
assessed. The performance of the experimental fans compares
well with both the reference fan as well as the design intent. / AFRIKAANSE OPSOMMING: 'n Ontwerpmetode vir lae drukstyging, enkel rotor aksiaal waaiers
is geformuleer, toegepas en bevestig deur gebruik te maak van
die ontwerppunt spesifikasies van 'n 1/6 skaal verwysingswaaier.
Twee eksperimentele waaiers is ontwerp deur middel van die
ontwerpmetode en getoets volgens die BS 848, Type A kode.
Die ontwerpmetode maak gebruik van die eenvoudig radiale ewewigsvergelykings
en 'n stel rekenaarprogramme. Die twee
eksperimentele waaiers het dieselfde naaf-huls verhouding en
werwel verdeling, maar verskil daarin dat verskillende
vleuelprofiele gebruik is vir elkeen van die twee waaiers. Die
eerste ontwerp maak gebruik van die bekende Clark-Y profiel
terwyl die tweede die moderne NASA LS profiel gebruik.
Die karakteristieke van die twee eksperimentele waaiers is
gemeet oor die hele werkbereik en vergelyk met die verwysings
waaier waardeur die geldigheid en akkuraatheid van die ontwerpmetode
bepaal is. Die werkverigting van die eksperimentele
waaiers vergelyk goed met die verwysingswaaier en bevredig die
ontwerpsdoelwitte.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/15528 |
| Date | 12 1900 |
| Creators | Bruneau, Phillippe Roger Paul, Von Backstrom, T. W. |
| Contributors | University of Stellenbosch. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering |
| Publisher | Stellenbosch : University of Stellenbosch |
| Source Sets | South African National ETD Portal |
| Language | en_ZA |
| Detected Language | English |
| Type | Thesis |
| Rights | University of Stellenbosch |
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