Numerical Study on the Ventilating and Cooling for Some Tunnel-workshop

摘要

Based on three-dimensional numerical simulation, the paper analyzes the effect of velocity ratio, which refers to the ratio of the jet velocity to that of cross flow, and the temperature of cross flow on the diffusion of heat. According to the conclusion, firstly, the heat jet diffuses adherently with a long wing and gradually develops towards the central zone, which directly leads to the enormous temperature gradient along the elevation direction. Secondly, the temperature drop corresponsive accompanies with the decreases of the temperature of cross flow and velocity ratio. By comparison, the latter mainly answers for the cooling effect. Lastly, the optimal design of general ventilation system is given out to maintain the relatively comfortable environment for most work area.