Die invloed van versteurde inlaatvloeipatrone op aksiaalwaaiers

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dc.contributor.advisor Kroger, D. G.
dc.contributor.author Visser, J. G. J.
dc.contributor.other University of Stellenbosch. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering en_ZA
dc.date.accessioned 2012-07-23T09:36:02Z
dc.date.available 2012-07-23T09:36:02Z
dc.date.issued 1990-12
dc.identifier.uri http://hdl.handle.net/10019.1/21767
dc.description Stellenbosch University. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering. en_ZA
dc.description Thesis (MEng)--Stellenbosch University, 1990. en_ZA
dc.description.abstract ENGLISH 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.abstract AFRIKAANSE 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.extent 350 p. : ill.
dc.language.iso af en_ZA
dc.publisher Stellenbosch : Stellenbosch University en_ZA
dc.subject Axial flow fans en_ZA
dc.subject Draft cooling towers en_ZA
dc.subject Power station en_ZA
dc.subject Fans (Machinery) -- Performance. en_ZA
dc.subject Dissertations -- Mechanical engineering en_ZA
dc.subject Theses -- Mechanical engineering en_ZA
dc.subject Air flow en_ZA
dc.subject Cooling towers en_ZA
dc.title Die invloed van versteurde inlaatvloeipatrone op aksiaalwaaiers af
dc.type Thesis en_ZA
dc.rights.holder Stellenbosch University en_ZA


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