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Scalar dispersion in the near wake of a simplified model car

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Abstract

Experimental results on tracer gas diffusion within the near wake of a simplified model car (Ahmed model with a rear slant angle of 25°) are presented. Pollutant emission is simulated using heated air injected through a small pipe at one side of the model base. Fine cold wire thermometry is used to measure instantaneous temperature excess in the near wake. Characteristics of the temperature field over the Reynolds number range (1.3×104<Re L<7×104) show strong differences as a result of transition in the wake at a critical Reynolds number Re Lc=2.7×104.

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Abbreviations

c p :

Specific heat (J kg−1 K−1)

d s :

Exhaust pipe diameter (m)

H :

Model height (m)

L :

Model length (m)

T :

Temperature excess with respect to ambient (K)

P :

Electric power (W)

R :

T j/T=1/T*, dilution ratio

U ∞ :

Streamwise velocity (m s−1)

U j :

Exhaust jet velocity (m s−1)

W :

Model width (m)

x :

Streamwise coordinate (m)

y :

Vertical coordinate (m)

z :

Transverse coordinate (m)

α:

Rear slant angle

ρ:

Density (kg m−3)

*:

Dimensionless

<>:

Mean value

j:

Exhaust jet

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Acknowledgements

The support of the Région Haute-Normandie (Programme Topaase) is gratefully acknowledged.

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Authors and Affiliations

  1. LTH, UMR 6614 C.N.R.S. CORIA, Université de Rouen, 76801, Saint Etienne du Rouvray Cedex, France

    Kévin Gosse, Béatrice Patte-Rouland, Michel Gonzalez & Pierre Paranthoën

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  1. Kévin Gosse
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  2. Béatrice Patte-Rouland
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  3. Michel Gonzalez
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  4. Pierre Paranthoën
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Correspondence to Kévin Gosse.

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Gosse, K., Patte-Rouland, B., Gonzalez, M. et al. Scalar dispersion in the near wake of a simplified model car. Exp Fluids 40, 135–140 (2006). https://doi.org/10.1007/s00348-005-0055-z

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  • DOI: https://doi.org/10.1007/s00348-005-0055-z

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