定量式粉尘气溶胶发生器，干粉气溶胶发生器，粉尘发生器

The deposition of particles within high-speed trains’ air supply ducts can significantly affect air supply quality,
energy efficiency, and the respiratory health of passengers. To study particulate deposition characteristics in such
ventilation ducts, an experimental setup replicating a high-speed train air supply duct was constructed. The
effects of airflow rate, absolute humidity, particle size, and concentration were quantitatively analyzed. Results
indicate that the duct’s structure heavily influences deposition patterns, with particles mainly depositing in the
main duct and static pressure chamber, while minimal deposition occurs in bent regions. At an airflow rate of
1200 m³/h, the deposition flux shows limited dependence on particle size, but this dependence becomes sig-
nificant at 1800 m³/h. Increasing particle concentration leads to varying increases in deposition flux across duct
surfaces, with bent regions showing a greater sensitivity to concentration changes. High absolute humidity en-
courages the deposition of smaller particles but has little impact on larger particles. These findings offer valuable
insights into the mechanisms of dust accumulation in train air conditioning systems.