Experimental study of fluctuation, parameters and high-order values of velocity in the wake of a car model

Abstract: In spite of the fact that turbulence is one of the very old issues in the domain of fluid mechanics, it has been remained unresolved. In this paper is done the experimental investigated on the flow dynamics and the high-order parameters such as Flatness and skewness of wake of vehicle model also is shown The Frequency variations vortex formation at the maximum amplitude, strohal Number and Length scale Incorporation. All testing was performed aerodynamic Hakim Sabzevari University To measure the flow characteristics, the wind tunnel and a hot wire flow meter Made by Saba Frasnjsh is used. The maximum disturbances and nominal maximum speed of the device, respectively are, 0. 1% and 30 m / s. The results showed: Skewness values at lower altitudes are less than its values at higher altitudes that it has a reverse trend with increasing distance from the vehicle. Flatness values gradually decreased with increasing distance from the vehicle. The strohal number is often reduced by increasing the distance between car and trailer. And mixing length scale within the wake often has one or two maximum peaks. The wake of Trailer for near car locations to the trailer dosent have any Effect on the formation of the maximum peak is mixing length scale.