The Effect of Base Bleed and Rear Cavities on the Drag of an SUV

Apr 16, 20103 likes2,315 views

The study investigated the effect of base bleed and rear cavities on the drag of an SUV. Various configurations were tested, including external cavities, restricted area cavities, ventilated cavities, simple internal cavities, and combined cavities with central and peripheral base bleed. Wake surveys showed that rear body cavities and passive base bleed systems can reduce drag, but base bleed is severely restricted by intake momentum drag which increases with the base bleed coefficient. Active base bleed systems may not provide benefit either as the fan power consumed could offset any drag reduction.

The Effect of Base Bleed and Rear Cavities on the Drag of an SUV Y A Irving Brown, Jaguar Land Rover S Windsor , Jaguar Land Rover A P Gaylard , Jaguar Land Rover

Motivation Base drag accounts for ~30% of total, for LR vehicles Viswanath (1996), “drag reduction .. can be achieved by various passive devices even when the (unmanipulated) base flow is not characterised by vortex shedding.” Morel (1979) axisymmetric cylinder - drag coefficient reduced by cavity depths up to ~0.35d. Howell et al. (2003) found benefits from both “low flow rate base bleed” and rear cavities. Paper 2010-01-0512

Configurations Investigated Paper 2010-01-0512 Project investigated External cavities Restricted area cavities Ventilated cavities Simple internal cavities Combined cavities Central base bleed Peripheral base bleed

rear cavity effect (moving ground) Paper 2010-01-0512

Passive base bleed concept Paper 2010-01-0512

Base bleed – rear cavity interaction Paper 2010-01-0512

Wake surveys – base vehicle Paper 2010-01-0512

Wake surveys – modified vehicle Paper 2010-01-0512 Body Cavity Body Cavity & Base Bleed

Wake survey – base bleed effect Paper 2010-01-0512

Peripheral base bleed Paper 2010-01-0512

Base bleed coefficient vs. intake drag Paper 2010-01-0512

A simple assessment of active base bleed Paper 2010-01-0512

Conclusions Paper 2010-01-0512 Rear body cavities reduce drag. Passive base bleed systems can reduce drag Severely restricted by the intake momentum drag. (D intake  C q ) Active base bleed systems may not offset the fan power consumed. Howell et al. (2003), “The power required to generate the bleed flow will offset the drag benefit, and may negate it.”

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The Effect of Base Bleed and Rear Cavities on the Drag of an SUV

1. The Effect of Base Bleed and Rear Cavities on the Drag of an SUV Y A Irving Brown, Jaguar Land Rover S Windsor , Jaguar Land Rover A P Gaylard , Jaguar Land Rover

2. Motivation Base drag accounts for ~30% of total, for LR vehicles Viswanath (1996), “drag reduction .. can be achieved by various passive devices even when the (unmanipulated) base flow is not characterised by vortex shedding.” Morel (1979) axisymmetric cylinder - drag coefficient reduced by cavity depths up to ~0.35d. Howell et al. (2003) found benefits from both “low flow rate base bleed” and rear cavities. Paper 2010-01-0512

3. Configurations Investigated Paper 2010-01-0512 Project investigated External cavities Restricted area cavities Ventilated cavities Simple internal cavities Combined cavities Central base bleed Peripheral base bleed

4. rear cavity effect (moving ground) Paper 2010-01-0512

5. Passive base bleed concept Paper 2010-01-0512

6. Base bleed – rear cavity interaction Paper 2010-01-0512

7. Wake surveys – base vehicle Paper 2010-01-0512

8. Wake surveys – modified vehicle Paper 2010-01-0512 Body Cavity Body Cavity & Base Bleed

9. Wake survey – base bleed effect Paper 2010-01-0512

10. Peripheral base bleed Paper 2010-01-0512

11. Base bleed coefficient vs. intake drag Paper 2010-01-0512

12. A simple assessment of active base bleed Paper 2010-01-0512

13. Conclusions Paper 2010-01-0512 Rear body cavities reduce drag. Passive base bleed systems can reduce drag Severely restricted by the intake momentum drag. (D intake  C q ) Active base bleed systems may not offset the fan power consumed. Howell et al. (2003), “The power required to generate the bleed flow will offset the drag benefit, and may negate it.”

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The Effect of Base Bleed and Rear Cavities on the Drag of an SUV

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The Effect of Base Bleed and Rear Cavities on the Drag of an SUV