Numerical simulation study on the exhaust gas migration of fuel vehicles under an airflow field in the confined space of an underground coal mine

Abstract

As the main tool for transporting people and materials in coal mines with inclined shafts, fuel vehicles easily cause exhaust gas accumulation and significant pollution due to the special underground environment. In this paper, the problem of exhaust gas migration under the action of a special airflow field in underground confined space is studied. First, a physical model of exhaust gas migration in the confined space of an underground coal mine is established. By combining numerical simulations with field measurements, the law of exhaust gas migration of fuel vehicles under the action of an airflow field in a confined space is studied. The results show that the migration and diffusion of CO gas in exhaust gas are affected by airflow, and the concentration decreases with an increasing distance. The main irregular pollution area is concentrated within one meter of the space behind the vehicle. The pollution area of more than 24 ppm is approximately 0.124 m2, the pollution length is approximately 0.767 m, and the pollution width and height are 1.16 m and 1.83 m, respectively. In the adjustable range of the research conditions and air speed, the increase in the air speed can accelerate the dilution of CO gas, but it needs to be maintained in a reasonable air speed range. In this paper, a theoretical basis for exploring the migration and distribution of fuel vehicle exhaust pollution in confined spaces is provided.