NUMERICAL RESEARCH OF AIR QUALITY IN HARD-SEAT COMPARTMENT OF YZ25K PASSENGER CARS

摘要

Based on steady state incompressible Reynolds-averaged Navier-Stokes equation, k-ε turbulence model, the air quality in hard-seat compartment of YZ25K passenger cars is simulated numerically. The cube substituting passenger and regarding human exhaled CO2 as a representative of pollutants, based on PMV and relative concentration, a new air quality index(AQI) is put forward to evaluate the air quality in the car, considering the thermal comfort and indoor air quality. The results show that supply air velocity has much effect on air quality. The increase of supply air velocity helps to improve the air quality but too large supply air velocity gets air quality worse. When the supply air velocity is 2.5m/s in sew supply air mode, the air quality is best, which can meet the needs of good thermal comfort and indoor air quality simultaneously in the car.