基于无叶风扇改造的某型地铁车厢气流组织实验与数值模拟研究

In order to improve the airflow pattern in subway carriages to enhance thermal comfort, bladeless fans developed based on turbine technology were introduced into the subway carriages for renovation. Both methods of experiments and numerical simulations were used to study the airflow pattern in the subway under different working conditions before and after the retrofitting, and the results were analyzed in terms of velocity field, temperature field, air age and air diffusion performance Index(ADPI). The results show that after the retrofitting of the subway carriages with bladeless fans, the air supply velocity of the bladeless fan can be reasonably designed to improve the airflow organization performance in subway carriages. Compared with before retrofitting subway carriages, adopting the bladeless fans and setting the supply air velocity of 4 m/s, the subway carriages airflow velocity non-uniformity coefficient, the average air age in the breathing zone would reduce by 0.16 and 3.7 s respectively, and ADPI is improved by 11.09%.