AERODYNAMIC DRAG REDUCTION OF A GENERIC LORRY MODEL USING SYNTHETIC JETS

The present study investigated the application of active flow control to reduce the aerodynamic drag of
lorries. The actuator generated low-frequency synthetic jets were employed the wake region. Airflow
through the squared-back Ahmed body was simulated using the Spalart-Allmaras detached eddy
simulation. The Strouhal number (St) of jet injections was chosen at 0.2, 1.0, 2.0, and 4.0, close to the
vortex shedding frequency. The results indicate that the jets affect wake structure. The optimal drag
reduction is obtained at St = 4.0. The drag coefficient is reduced by 1.26% and the mean base pressure
is recovered by 4.50%.