Aerodynamic drag improvements on a square-back vehicle at yaw using a tapered cavity and asymmetric flaps.
Saved in:
| Title: | Aerodynamic drag improvements on a square-back vehicle at yaw using a tapered cavity and asymmetric flaps. |
|---|---|
| Authors: | Urquhart, Magnus1 (AUTHOR) magnus.urquhart@chalmers.se, Varney, Max2 (AUTHOR) m.varney@lboro.ac.uk, Sebben, Simone1 (AUTHOR) simone.sebben@chalmers.se, Passmore, Martin2 (AUTHOR) m.a.passmore@lboro.ac.uk |
| Source: | International Journal of Heat & Fluid Flow. Dec2020, Vol. 86, pN.PAG-N.PAG. 1p. |
| Subjects: | Loughborough University, Drag (Aerodynamics), Particle image velocimetry, Drag coefficient, Wind tunnels, Tomography, Crosswinds |
| Abstract: | Emissions of greenhouse gasses from passenger vehicles is a concern globally. One of the factors that influence the vehicles energy consumption is the aerodynamic drag, continuing to be an active topic of interest. This work investigates the vehicle wake in relation to aerodynamic drag in steady crosswind conditions. The vehicle used is a modified version of the generic Windsor geometry with wheels and a rearward-facing base cavity with nine angled surfaces, or flaps, distributed at the trailing edge of the cavity along the roof and sides. A surrogate model-based optimisation algorithm was used to minimise the drag coefficient by optimising the angle of each flap individually. The experiments were performed in the Loughborough University Large Wind Tunnel. The time-averaged and unsteady results of both the base pressures and tomographic Particle Image Velocimetry indicate that the optimised flap angles improve drag primarily by altering the wake balance. This is achieved by reducing the strength of a large leeward side vortex, reducing the crossflow within the wake. • Optimisation of nine trailing edge flaps led to unexpected designs with low drag. • Tomographic Particle Image Velocimetry of the wake revealed balance improvements. • Reduction of crossflow in the vehicle wake correlated well with improvements to drag. [ABSTRACT FROM AUTHOR] |
| Copyright of International Journal of Heat & Fluid Flow is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
|---|---|
| Header | DbId: egs DbLabel: Engineering Source An: 147527590 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
| IllustrationInfo | |
| Items | – Name: Title Label: Title Group: Ti Data: Aerodynamic drag improvements on a square-back vehicle at yaw using a tapered cavity and asymmetric flaps. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Urquhart%2C+Magnus%22">Urquhart, Magnus</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> magnus.urquhart@chalmers.se</i><br /><searchLink fieldCode="AR" term="%22Varney%2C+Max%22">Varney, Max</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> m.varney@lboro.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Sebben%2C+Simone%22">Sebben, Simone</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> simone.sebben@chalmers.se</i><br /><searchLink fieldCode="AR" term="%22Passmore%2C+Martin%22">Passmore, Martin</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> m.a.passmore@lboro.ac.uk</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Heat+%26+Fluid+Flow%22">International Journal of Heat & Fluid Flow</searchLink>. Dec2020, Vol. 86, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Loughborough+University%22">Loughborough University</searchLink><br /><searchLink fieldCode="DE" term="%22Drag+%28Aerodynamics%29%22">Drag (Aerodynamics)</searchLink><br /><searchLink fieldCode="DE" term="%22Particle+image+velocimetry%22">Particle image velocimetry</searchLink><br /><searchLink fieldCode="DE" term="%22Drag+coefficient%22">Drag coefficient</searchLink><br /><searchLink fieldCode="DE" term="%22Wind+tunnels%22">Wind tunnels</searchLink><br /><searchLink fieldCode="DE" term="%22Tomography%22">Tomography</searchLink><br /><searchLink fieldCode="DE" term="%22Crosswinds%22">Crosswinds</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Emissions of greenhouse gasses from passenger vehicles is a concern globally. One of the factors that influence the vehicles energy consumption is the aerodynamic drag, continuing to be an active topic of interest. This work investigates the vehicle wake in relation to aerodynamic drag in steady crosswind conditions. The vehicle used is a modified version of the generic Windsor geometry with wheels and a rearward-facing base cavity with nine angled surfaces, or flaps, distributed at the trailing edge of the cavity along the roof and sides. A surrogate model-based optimisation algorithm was used to minimise the drag coefficient by optimising the angle of each flap individually. The experiments were performed in the Loughborough University Large Wind Tunnel. The time-averaged and unsteady results of both the base pressures and tomographic Particle Image Velocimetry indicate that the optimised flap angles improve drag primarily by altering the wake balance. This is achieved by reducing the strength of a large leeward side vortex, reducing the crossflow within the wake. • Optimisation of nine trailing edge flaps led to unexpected designs with low drag. • Tomographic Particle Image Velocimetry of the wake revealed balance improvements. • Reduction of crossflow in the vehicle wake correlated well with improvements to drag. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of International Journal of Heat & Fluid Flow is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=147527590 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.ijheatfluidflow.2020.108737 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Loughborough University Type: general – SubjectFull: Drag (Aerodynamics) Type: general – SubjectFull: Particle image velocimetry Type: general – SubjectFull: Drag coefficient Type: general – SubjectFull: Wind tunnels Type: general – SubjectFull: Tomography Type: general – SubjectFull: Crosswinds Type: general Titles: – TitleFull: Aerodynamic drag improvements on a square-back vehicle at yaw using a tapered cavity and asymmetric flaps. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Urquhart, Magnus – PersonEntity: Name: NameFull: Varney, Max – PersonEntity: Name: NameFull: Sebben, Simone – PersonEntity: Name: NameFull: Passmore, Martin IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 12 Text: Dec2020 Type: published Y: 2020 Identifiers: – Type: issn-print Value: 0142727X Numbering: – Type: volume Value: 86 Titles: – TitleFull: International Journal of Heat & Fluid Flow Type: main |
| ResultId | 1 |
