Study on the Evolution Characteristics of the Particle Distribution in the Vehicle Exhaust Plume
汽车排气尾流中微粒分布及其变化特性的研究

The evolution characteristics of particle distribution in the vehicle exhaust plume have been investigated based on the models of nucleation, coagulation and condensation of particles. The simulated results showed that nucleation created a large number of new nano-particles, and coagulation and condensation changed the distribution of particles in the vehicle exhaust plume. The effect of nucleation on the distribution of exhaust particles was weaker, and the distribution of exhaust particles was affected mainly by the effect of coagulation and condensation. The process of nucleation, coagulation and condensation was intense near the exit of the tailpipe and the variation of the particle distribution with time was strong. With the increase of the distance from the exit of the tailpipe, the evolution of exhaust particles got weaker. This work can provide much more information necessary for the establishment of vehicle emission control strategies and the study of the effect of vehicle particles on the human health.