Abstract
The flow field around an automobile is very complex, characterized by a high degree of three dimensionality, flow separation, reattachment and vortex formation. Flow visualization as well as flow simulation are helpful tools during the aerodynamic design of vehicles. The research-undertaken deals with an experimental estimation of CD (drag coefficient) for TOYOTA car,(scale 1/20) using the strain gauge method ( FLA-6-11 type, 120Ω, 2.12 gauge factor, half-bridge connection), which was proved to be practical and reasonably accurate. Experiments were run within a subsonic aspiration wind tunnel, covering an air speed up to 33 m/s (i.e., Reynolds number 5.7 x 10 5 ). Results for drag coefficient were obtained in the range of 1.10 to 0.53. It was noted that the magnitude of CD decreased from 1.10 at 21.18 m/s to 0.53 at 33.00 m/s (i.e., decrease of drag coefficient by about 50%). Comparison of our results with those given by other authors is satisfactory.
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