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dc.contributor.advisorKroger, D. G.
dc.contributor.authorVisser, J. G. J.
dc.contributor.otherUniversity of Stellenbosch. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineeringen_ZA
dc.date.accessioned2012-07-23T09:36:02Z
dc.date.available2012-07-23T09:36:02Z
dc.date.issued1990-12
dc.identifier.urihttp://hdl.handle.net/10019.1/21767
dc.descriptionStellenbosch University. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering.en_ZA
dc.descriptionThesis (MEng)--Stellenbosch University, 1990.en_ZA
dc.description.abstractENGLISH ABSTRACT: The causes of disturbances in the flow patterns at the inlets of axial flow fans that are used in mechanical draft cooling towers and the effects of these disturbances on the fans, were investigated. A scale model of a part of a mechanical draft cooling tower used at a power station was built for the purpose of this study. In the cooling tower the axial flow fans are arranged in a matrix configuration. It was noted from the scale model that the boundary fan was subjected to the worst inlet disturbances and this had an adverse effect on the flow it produced. Geometric alterations like the use of guide vanes and rounded inlets improved the flow through the boundary fan considerably. It was found that the performance of the fans is a function of the number of fans used and the elevation of the fans. Several tests to determine the performance of the cooling tower confirmed the results obtained from the experiments on the scale model. It was also found that the speed and direction of the prevailing wind have a significant effect on the cooling tower. Experiments to investigate the effects of cross-flow at the inlet of a fan indicated an increased flow through the fan at low cross-flow velocities and that the flow decreased at high cross-flow velocities.en_ZA
dc.description.abstractAFRIKAANSE OPSOMMING: Die invloed en oorsake van versteurde inlaatvloeipatrone op aksiaalwaaiers wat in meganiese-trek koeltorings gebruik word is ondersoek. 'n Skaaimodel van 'n deel van 'n meganiese-trek koeltoring wat by 'n kragstasie gebruik word is gebou vir die doel van die studie. Die aksiaalwaaiers wat in die koeltoring gebruik word is in 'n matrikskonfigurasie gerangskik. Vanaf die skaalmodel is waargeneem dat die randwaaier die ergste versteuring by die inlaat ervaar, en gevolglik minder vloei as die res van die waaiers in die opstelling lewer. Die vloei deur die randwaaier is verbeter deur verskillende geometriese wysigings soos leilemme en inlaatafrondings aan te bring. Daar is gevind dat die werking van die waaiers in die opstelling 'n funksie van die hoeveelheid waaiers asook die grondvryhoogte is. Om die werking van die koeltoring te bepaal is verskillende toetse daarop uitgevoer. Die resultate het die geldigheid van die skaalmodel bevestig. Daar is ook gevind dat die heersende windsterkte en rigting 'n definitiewe invloed op die koeltoring uitoefen. Die invloed van 'n dwarsvloei by die inlaat van 'n enkele waaier is ook eksperimenteel ondersoek. Die resultate toon dat daar 'n vermeerdering in vloei deur die waaier by lae dwarsvloeisnelhede plaasvind. Hoë dwarsvloeisnelhede veroorsaak egter 'n vermindering in vloei.af
dc.format.extent350 p. : ill.
dc.language.isoafen_ZA
dc.publisherStellenbosch : Stellenbosch Universityen_ZA
dc.subjectAxial flow fansen_ZA
dc.subjectDraft cooling towersen_ZA
dc.subjectPower stationen_ZA
dc.subjectFans (Machinery) -- Performance.en_ZA
dc.subjectDissertations -- Mechanical engineeringen_ZA
dc.subjectTheses -- Mechanical engineeringen_ZA
dc.subjectAir flowen_ZA
dc.subjectCooling towersen_ZA
dc.titleDie invloed van versteurde inlaatvloeipatrone op aksiaalwaaiersaf
dc.typeThesisen_ZA
dc.rights.holderStellenbosch Universityen_ZA


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