Study on Air Flow Distribution of Ventilating System in the Low Pressure Chamber for Controlling the Tobacco Smoke

摘要

Most modern tobacco industries have chambers to evaluate the quality of tobacco samples. In the academe, this chamber should also produce a low pressure likely to the atmospheric pressure in high altitude area. A ventilation system should be used in the chamber to controlling the tobacco smoke. This study aims at the air flow distribution of a ventilation system of the chamber with the low pressure and assessing its controlling effect on tobacco smoke. Computational Fluid Dynamic method is applied for the simulation of air flow field and smoke moving path in a condition of low pressure in the chamber. Furthermore, a distance-data acquisition system is set up in the camber to monitor the air velocities of six particular positions close to inlets or outlets. The numerical simulating results in this study can show us the effect of the air flow distribution and air flow velocity in the chamber, which can be proved validity by the results from the distance-data acquisition system. In this case, the locations of the inlets and outlets of ventilation system may be the key factor in the design of the ventilation system. It can be also concluded that the better air flow distribution may decrease the turbulent circuit and reduce the dust deposit in the corners of the chamber.