Design and analysis of a viscous film dynamometer for wide range turbocharger turbine performance mapping

The transient nature of automotive exhaust gas flow is a significant obstacle to turbocharger turbine optimisation, with the need to optimise performance for pulsating flow and maintain acceptable performance across a wide range of engine operating conditions. Standard industrial testing methods are...

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Main Author: Boyd, Michael
Other Authors: Spence, Stephen ; Kim, Sung
Published: Queen's University Belfast 2018
Subjects:
620
Online Access:https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.737782
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spelling ndltd-bl.uk-oai-ethos.bl.uk-7377822019-03-05T16:04:28ZDesign and analysis of a viscous film dynamometer for wide range turbocharger turbine performance mappingBoyd, MichaelSpence, Stephen ; Kim, Sung2018The transient nature of automotive exhaust gas flow is a significant obstacle to turbocharger turbine optimisation, with the need to optimise performance for pulsating flow and maintain acceptable performance across a wide range of engine operating conditions. Standard industrial testing methods are incapable of applying the desired power absorption, due to the inherent limitations of radial compressors, and therefore are limited in their ability to map turbine characteristics. Firstly, this project investigated existing technologies and identified a design approach which allowed development of a novel turbine dynamometer for small automotive turbine applications. The design approach was documented with consideration of component sizing, stress, rotordynamics, component assembly and instrumentation requirements. A novel model for determining viscous torque within a high speed oil film operating under shear stress was developed. A prototype test rig was designed and commissioned based on an existing turbocharger unit which was modified to accept a novel loading device. This prototype device was used to test the turbine over a wide range of conditions, and was used to validate the new viscous model. A second test rig was developed with an expanded feature set, based on the findings of the prototype. Velocity ratio values from 0.075 to 0.596 were achieved and a new loading device configuration was implemented to allow for continuous loading variation during tests. Measured efficiency values were shown to match well with CFD simulations. Instability within the oil film of the device was identified and studied, indicating areas where this was likely to occur and suggesting that shaft vibration interacting with cavitation regions was causing fracture of the oil film. A CFD analysis of the oil film was used in conjunction with experimental data to identify flow phenomena which caused the initiation of this film fracture.620Queen's University Belfasthttps://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.737782https://pure.qub.ac.uk/portal/en/theses/design-and-analysis-of-a-viscous-film-dynamometer-for-wide-range-turbocharger-turbine-performance-mapping(a5c21425-5cca-4fb3-b4e0-d3976e28ab7c).htmlElectronic Thesis or Dissertation
collection NDLTD
sources NDLTD
topic 620
spellingShingle 620
Boyd, Michael
Design and analysis of a viscous film dynamometer for wide range turbocharger turbine performance mapping
description The transient nature of automotive exhaust gas flow is a significant obstacle to turbocharger turbine optimisation, with the need to optimise performance for pulsating flow and maintain acceptable performance across a wide range of engine operating conditions. Standard industrial testing methods are incapable of applying the desired power absorption, due to the inherent limitations of radial compressors, and therefore are limited in their ability to map turbine characteristics. Firstly, this project investigated existing technologies and identified a design approach which allowed development of a novel turbine dynamometer for small automotive turbine applications. The design approach was documented with consideration of component sizing, stress, rotordynamics, component assembly and instrumentation requirements. A novel model for determining viscous torque within a high speed oil film operating under shear stress was developed. A prototype test rig was designed and commissioned based on an existing turbocharger unit which was modified to accept a novel loading device. This prototype device was used to test the turbine over a wide range of conditions, and was used to validate the new viscous model. A second test rig was developed with an expanded feature set, based on the findings of the prototype. Velocity ratio values from 0.075 to 0.596 were achieved and a new loading device configuration was implemented to allow for continuous loading variation during tests. Measured efficiency values were shown to match well with CFD simulations. Instability within the oil film of the device was identified and studied, indicating areas where this was likely to occur and suggesting that shaft vibration interacting with cavitation regions was causing fracture of the oil film. A CFD analysis of the oil film was used in conjunction with experimental data to identify flow phenomena which caused the initiation of this film fracture.
author2 Spence, Stephen ; Kim, Sung
author_facet Spence, Stephen ; Kim, Sung
Boyd, Michael
author Boyd, Michael
author_sort Boyd, Michael
title Design and analysis of a viscous film dynamometer for wide range turbocharger turbine performance mapping
title_short Design and analysis of a viscous film dynamometer for wide range turbocharger turbine performance mapping
title_full Design and analysis of a viscous film dynamometer for wide range turbocharger turbine performance mapping
title_fullStr Design and analysis of a viscous film dynamometer for wide range turbocharger turbine performance mapping
title_full_unstemmed Design and analysis of a viscous film dynamometer for wide range turbocharger turbine performance mapping
title_sort design and analysis of a viscous film dynamometer for wide range turbocharger turbine performance mapping
publisher Queen's University Belfast
publishDate 2018
url https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.737782
work_keys_str_mv AT boydmichael designandanalysisofaviscousfilmdynamometerforwiderangeturbochargerturbineperformancemapping
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