Numerical analysis of spatial and temporal distribution of exhaust emissions from multiple underground diesel vehicles under different idling conditions

In this study, the temporal and spatial distribution of NO_X and PM emissions from multiple underground diesel vehicles under different idling conditions were studied, and the high exhaust concentration risk zone from idling vehicles were identified, which posed a serious threat to the health of underground personnel. The results show that the working conditions of diesel vehicles in the meeting chamber have a certain impact on the exhaust emissions of diesel vehicles in the straight roadway. When the rear of the vehicle enters the chamber first, the diffusion trends of NO_X and PM from the rear vehicle in the straight roadway are basically consistent. However, when the front of the vehicle enters the chamber first, the diffusion of PM from the rear vehicle in the straight roadway is slower than that of NO_X, and the diffusion distances differ by 4 m. In addition, drivers at the rear of vehicles in the straight roadway and drivers at the front of vehicles in the chamber are more likely to encounter high exhaust concentrations. Therefore, suitable protective measures must be employed to ensure safe production.