NUMERICAL SIMULATION OF VENTILATION SYSTEM WITHIN AN ARMORED VEHICLE CABIN

摘要

This paper utilizes computational fluid dynamics (CFD) to investigate the ventilation system within the cabin of an armored vehicle. Commercial ICEM/CFD software is employed to construct a model of the armored vehicle and FLUENT simulation software is applied to a turbulence model to perform steady- and unsteady-state analysis of the ventilation system under various imposed housing temperature conditions. The simulation results provide a complete analysis of the temperature distributions, velocity vectors, PMV indices, and local mean age of air in the cabin under steady-state conditions. In the unsteady state, the air emission speed increases with increasing temperature when the housing is assumed to be isothermal. Therefore, incorporating a heater -within the housing is likely to enhance the discharging of unclean gases. In the case of a heat insulating housing, the air emission speed is bounded by the emission speeds of the isothermal 10℃ and 30℃ housing temperature cases. Therefore, there is no clear correlation between the insulated and isothermal cases. The present unsteady-state analysis results are also applicable to general heat insulating films. Hence, the present results provide a valuable contribution to the development of enhanced ventilation systems for general industrial or military applications.