Pollutants emitted by motor vehicles mainly contribute to the degradation of air quality in urban cities or near highways. For this reason, air-quality regulations concerning automobiles emissions are becoming more stringent in controlling the composition and quantity of exhaust gases. Vehicular emissions of concern include both primary and secondary reactive or non-reactive gases (CO2, CO, NO(x), SO2, HC, COV) and ultrafine particles (0.05-1 micron). In order to comply with the next strict air pollution standards, automobile manufacturers try to find out new solutions to reduce aerodynamic drag and limit fuel consumption. Experimental results on tracer gas diffusion within the near wake of a simplified model car (Ahmed model with a rear slant angle of 25 deg) 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 (1.3x104 < ReL < 7x104) show strong differences as a result of transition in the wake at a critical Reynolds number ReLc = 2.7x104.


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    Title :

    Scalar dispersion in the near wake of a simplified model car


    Additional title:

    Simulierte Abgasdispersion im Nachstrom eines vereinfachten Fahrzeugmodells


    Contributors:

    Published in:

    Experiments in Fluids ; 40 , 1 ; 135-140


    Publication date :

    2006


    Size :

    6 Seiten, 6 Bilder, 12 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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