A two-channel LDV system is used to obtain accurate airflow measurements around scale models of passenger cars in wind tunnel tests at the Nissan Research Center. A 2-watt argon-ion laser is employed as the light source. The main optical unit and probe head are connected by optical fibers. The probe head consists of a compact LDV probe with a beam expander and focusing lens with a long focal length can be easily traversed. A new type of signal processor, performing a digital autocorrelation function, is employed to process the Doppler signals. Mean airflow velocities and turbulence intensities are calculated by a micro computer to evaluate the flow fields. The results of preliminary experiments conducted with this system indicate that the system is not only capable of measuring the mean velocity components, including reverse flow, it can also provide accurate estimation of turbulence components.


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    Titel :

    Airflow measurement around passenger car models using a two-channel laser Doppler velocimeter


    Weitere Titelangaben:

    Luftströmungsmessung um ein Personenkraftwagenmodell herum mit dem Zweikanal-Laser Doppler Anemometer


    Beteiligte:
    Sato, H. (Autor:in) / Takagi, M. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1993


    Format / Umfang :

    7 Seiten, 8 Bilder, 11 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





    Airflow Measurement Around Passenger Car Models Using a Two-Channel Laser Doppler Velocimeter

    Sato, Hiroshi / Takagi, Michitoshi | SAE Technical Papers | 1993


    Engine compartment airflow investigations using a laser-doppler-velocimeter

    Cogotti,A. / Berneburg,H. / Pininfarina,IT | Kraftfahrwesen | 1991


    Engine Compartment Airflow Investigations Using a Laser-Doppler-Velocimeter

    Cogotti, A. / Berneburg, H. | SAE Technical Papers | 1991