Experimental Study of Air Flow in a Hydro Power Generator Model

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dc.contributor.authorHartono, Erwin
dc.contributor.departmentChalmers tekniska högskola / Institutionen för tillämpad mekaniksv
dc.contributor.departmentChalmers University of Technology / Department of Applied Mechanicsen
dc.date.accessioned2019-07-03T12:42:31Z
dc.date.available2019-07-03T12:42:31Z
dc.date.issued2011
dc.description.abstractAir cooled electric generators have been studied for a long time, but there is still a lack of knowledge about the details of the air flow in such machinery. In this work, a generator ventilation model was specially designed and constructed as a 1:2 model of an existing generator model in Uppsala University. Full flow Reynolds number similarity is achieved by increasing the rotation speed of the model generator. The rotor and the stator were built with rapid-prototyping techniques that could resolve the complex geometry with high accuracy. The manufacturing process also allows the inclusion of pressure taps, making it possible to measure the wall static pressure in the most interesting region. A sector of the stator was built in plexi-glass for the PIV measurements. Six configurations were investigated: two different stators with three different rotor fan blades. The rotational speed was kept constant for all cases to maintain the same Reynolds number. The static pressure at the stator coils, stator inner and outer walls, and the total pressure at the outlet of the stator channels were measured. Pressure transducer together with scanivalve were used to measure the static pressure around the coil. A custom made rake was built to measure the total pressure at the outlet of the channel. Mass flow was estimated by integrating the total pressure data from the outlet. Two static pressure taps at the top of enclosure wall was made to estimate the flow angles. Around the coil the air flow has a large tangential component when entering the stator channels. The air flow was estimated to be swirl due to high flow angle. The static pressure at the stator inner wall increases as the air flows axially in the space between the rotor and stator. Half of the stator cooling channel was occupied by recirculation region. Estimated mass flow has approximately half the value compared to numerical calculation of 100% scale generator in Uppsala in accordance with design expectations.
dc.identifier.urihttps://hdl.handle.net/20.500.12380/147717
dc.language.isoeng
dc.relation.ispartofseriesDiploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden : 2011:51
dc.setspec.uppsokTechnology
dc.subjectEnergi
dc.subjectHållbar utveckling
dc.subjectStrömningsmekanik
dc.subjectEnergy
dc.subjectSustainable Development
dc.subjectFluid mechanics
dc.titleExperimental Study of Air Flow in a Hydro Power Generator Model
dc.type.degreeExamensarbete för masterexamensv
dc.type.degreeMaster Thesisen
dc.type.uppsokH
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