Current research on vehicle aerodynamics often neglects the effects of sidewind and turbulence on the road.In this work,the influence of both sidewind and turbulent flow conditions on the aerodynamics of a squareback ...Current research on vehicle aerodynamics often neglects the effects of sidewind and turbulence on the road.In this work,the influence of both sidewind and turbulent flow conditions on the aerodynamics of a squareback Ahmed model is experimentally studied.The aerodynamic drag force,surface pressure and wake are measured at different yaw angles(β∈[0°,5°])and freestream turbulence(I_(x)∈[0%~15.4%]).Atβ=0°with turbulence,C_(d) and C_(b) increase monotonically with turbulence intensity,when I_(x)<8.7%,C_(d) and C_(b) are lower than uniform inflow condition.Atβ=5°,the sensitivity of the aerodynamic force to turbulence intensity decreases.When I_(x)<8.7%,little effect has been noted for C_(d),but at I_(x)=15.4%,C_(d) increases significantly.The wake length decrease monotonically with increasing turbulence intensity,and it is insensitive atβ=5°compared toβ=0°.The Reynolds stress are also more insensitive to the increase of turbulence intensity atβ=5°compared toβ=0°.This study can provide some reference for the impact of real road turbulence on vehicle aerodynamics.展开更多
文摘Current research on vehicle aerodynamics often neglects the effects of sidewind and turbulence on the road.In this work,the influence of both sidewind and turbulent flow conditions on the aerodynamics of a squareback Ahmed model is experimentally studied.The aerodynamic drag force,surface pressure and wake are measured at different yaw angles(β∈[0°,5°])and freestream turbulence(I_(x)∈[0%~15.4%]).Atβ=0°with turbulence,C_(d) and C_(b) increase monotonically with turbulence intensity,when I_(x)<8.7%,C_(d) and C_(b) are lower than uniform inflow condition.Atβ=5°,the sensitivity of the aerodynamic force to turbulence intensity decreases.When I_(x)<8.7%,little effect has been noted for C_(d),but at I_(x)=15.4%,C_(d) increases significantly.The wake length decrease monotonically with increasing turbulence intensity,and it is insensitive atβ=5°compared toβ=0°.The Reynolds stress are also more insensitive to the increase of turbulence intensity atβ=5°compared toβ=0°.This study can provide some reference for the impact of real road turbulence on vehicle aerodynamics.
