A New Drag Reduction Method Based on Exhaust Emission Trailing Vortex Control

Abstract

In order to enhance the drag reduction effect and reduce the aerodynamic drag of a small car, taking a small car as the research object, firstly, by studying the influence of the longitudinal and transverse vortices on the aerodynamic drag, the generation of the drag reduction in the tail direction is obtained. Then, according to the transient calculation method, the influence principle of the tail vortices on the drag is analysed and the method of controlling tail vortex by controlling exhaust emission is also discussed. Finally, the influence of the location and angle of the tail pipe and the shape of the tail pipe on drag reduction is studied. A new method of drag reduction using off-gas pulsating emission is proposed, and the principle of drag reduction using off-gas pulsating emission is compared with that of steady off-gas pulsating emission. The results show that when the off-gas is discharged, the drag reduction effect is certain when the different arrangement and shape of the tail pipe are considered, compared with the case without the off-gas discharging. The drag reduction effect is the most obvious when the tail pipe is at a 12-degree angle to the horizontal plane, while the circular tail pipe arranged in a certain position can reduce the drag by 3.48%, and the drag reduction effect of the off-gas pulsating discharge is more obvious than that of the steady discharge, which can reach 5.38%. The new drag reduction method based on exhaust emission control tail vortex can effectively alleviate the increasingly serious energy crisis, improve the utilization efficiency of automobile fuel, and improve the driving speed of automobile, so it has significant research value and broad application prospects. A new drag reduction method for exhaust emission control is studied in depth. It is very significant to reveal the principle of the influence of exhaust emission on vehicle driving speed, which is an important step to promote the use of exhaust emission to reduce vehicle aerodynamic drag.