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.
Airflow Measurement Around Passenger Car Models Using a Two-Channel Laser Doppler Velocimeter
Sae Technical Papers
International Congress & Exposition ; 1993
1993-03-01
Aufsatz (Konferenz)
Englisch
Airflow measurement around passenger car models using a two-channel laser doppler velocimeter
Kraftfahrwesen | 1993
|Engine Compartment Airflow Investigations Using a Laser-Doppler-Velocimeter
SAE Technical Papers | 1991
|Engine compartment airflow investigations using a laser-doppler-velocimeter
Kraftfahrwesen | 1991
|Profile drag from laser-Doppler velocimeter measurement
AIAA | 1984
|