An investigation into unsteady base bleed for drag reduction in bluff two-box SUVs

Andrew D. Lamond, Johnathan J. Kennedy, Matthew Stickland

Research output: Contribution to conferencePaper

Abstract

This paper discusses a preliminary investigation into the use of base bleed on a production SUV using CFD analysis. The paper shows the methods used in creating the computational model and conducting the analysis, and present the findings to date. The paper shows that the reduction in drag increases as the mass flow rate of air is increased when the flow is deflected at the outlet. By controlling the turbulent wake to the rear of the vehicle, it is shown in the paper that mass flow rates of under 2kg/s can reduce drag coefficient by 8.2% with an outlet on the side of the vehicle, and that a mass flow rate of under 1.5kg/s can reduce the drag coefficient by 10.7% for an outlet on the upper section of the rear of the vehicle. The paper also discusses the feasibility of base bleed being applied to a production vehicle.
LanguageEnglish
Number of pages12
Publication statusPublished - 6 Jul 2009
Event4th European Automotive Simulation Conference, EASC 2009 - Munich, Germany
Duration: 6 Jul 20097 Jul 2009

Conference

Conference4th European Automotive Simulation Conference, EASC 2009
CityMunich, Germany
Period6/07/097/07/09

Fingerprint

Drag reduction
Drag coefficient
Flow rate
Drag
Computational fluid dynamics
Air

Keywords

  • unsteady base bleed
  • drag reduction
  • SUVs
  • automotive simulation

Cite this

Lamond, A. D., Kennedy, J. J., & Stickland, M. (2009). An investigation into unsteady base bleed for drag reduction in bluff two-box SUVs. Paper presented at 4th European Automotive Simulation Conference, EASC 2009, Munich, Germany, .
Lamond, Andrew D. ; Kennedy, Johnathan J. ; Stickland, Matthew. / An investigation into unsteady base bleed for drag reduction in bluff two-box SUVs. Paper presented at 4th European Automotive Simulation Conference, EASC 2009, Munich, Germany, .12 p.
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abstract = "This paper discusses a preliminary investigation into the use of base bleed on a production SUV using CFD analysis. The paper shows the methods used in creating the computational model and conducting the analysis, and present the findings to date. The paper shows that the reduction in drag increases as the mass flow rate of air is increased when the flow is deflected at the outlet. By controlling the turbulent wake to the rear of the vehicle, it is shown in the paper that mass flow rates of under 2kg/s can reduce drag coefficient by 8.2{\%} with an outlet on the side of the vehicle, and that a mass flow rate of under 1.5kg/s can reduce the drag coefficient by 10.7{\%} for an outlet on the upper section of the rear of the vehicle. The paper also discusses the feasibility of base bleed being applied to a production vehicle.",
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Lamond, AD, Kennedy, JJ & Stickland, M 2009, 'An investigation into unsteady base bleed for drag reduction in bluff two-box SUVs' Paper presented at 4th European Automotive Simulation Conference, EASC 2009, Munich, Germany, 6/07/09 - 7/07/09, .

An investigation into unsteady base bleed for drag reduction in bluff two-box SUVs. / Lamond, Andrew D.; Kennedy, Johnathan J.; Stickland, Matthew.

2009. Paper presented at 4th European Automotive Simulation Conference, EASC 2009, Munich, Germany, .

Research output: Contribution to conferencePaper

TY - CONF

T1 - An investigation into unsteady base bleed for drag reduction in bluff two-box SUVs

AU - Lamond, Andrew D.

AU - Kennedy, Johnathan J.

AU - Stickland, Matthew

PY - 2009/7/6

Y1 - 2009/7/6

N2 - This paper discusses a preliminary investigation into the use of base bleed on a production SUV using CFD analysis. The paper shows the methods used in creating the computational model and conducting the analysis, and present the findings to date. The paper shows that the reduction in drag increases as the mass flow rate of air is increased when the flow is deflected at the outlet. By controlling the turbulent wake to the rear of the vehicle, it is shown in the paper that mass flow rates of under 2kg/s can reduce drag coefficient by 8.2% with an outlet on the side of the vehicle, and that a mass flow rate of under 1.5kg/s can reduce the drag coefficient by 10.7% for an outlet on the upper section of the rear of the vehicle. The paper also discusses the feasibility of base bleed being applied to a production vehicle.

AB - This paper discusses a preliminary investigation into the use of base bleed on a production SUV using CFD analysis. The paper shows the methods used in creating the computational model and conducting the analysis, and present the findings to date. The paper shows that the reduction in drag increases as the mass flow rate of air is increased when the flow is deflected at the outlet. By controlling the turbulent wake to the rear of the vehicle, it is shown in the paper that mass flow rates of under 2kg/s can reduce drag coefficient by 8.2% with an outlet on the side of the vehicle, and that a mass flow rate of under 1.5kg/s can reduce the drag coefficient by 10.7% for an outlet on the upper section of the rear of the vehicle. The paper also discusses the feasibility of base bleed being applied to a production vehicle.

KW - unsteady base bleed

KW - drag reduction

KW - SUVs

KW - automotive simulation

M3 - Paper

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Lamond AD, Kennedy JJ, Stickland M. An investigation into unsteady base bleed for drag reduction in bluff two-box SUVs. 2009. Paper presented at 4th European Automotive Simulation Conference, EASC 2009, Munich, Germany, .