Scalar dispersion in the near wake of a simplified model car

Experimental results on tracer gas diffusion within the near wake of a simplified model car (Ahmed model with a rear slant angle of 25 degree ) 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 u...

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Bibliographic Details
Published in:Experiments in fluids 2006, Vol.40 (1), p.135-140
Main Authors: GOSSE, Kévin, PATTE-ROULAND, Béatrice, GONZALEZ, Michel, PARANTHOËN, Pierre
Format: Article
Language:English
Subjects:
Aerodynamics
Applied sciences
Computational fluid dynamics
Dispersions
Engineering Sciences
Environmental Engineering
Environmental Sciences
Exact sciences and technology
Fluid flow
Ground, air and sea transportation, marine construction
Near wakes
Reactive fluid environment
Reynolds number
Road transportation and traffic
Scalars
Wire
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Summary:Experimental results on tracer gas diffusion within the near wake of a simplified model car (Ahmed model with a rear slant angle of 25 degree ) 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 x 10 super(4) < Re sub(L) < 7 x 10 super(4)) show strong differences as a result of transition in the wake at a critical Reynolds number Re sub(Lc) = 2.7 x 10 super(4).
ISSN:0723-4864
1432-1114
DOI:10.1007/s00348-005-0055-z