Numerical Simulation Analysis of Cleanable Uniform Air Ducts in Metro Vehicles

Abstract

Objective With the increasing demand of passengers for air quality and uniform air supply in metro train interiors, it is necessary to study how to improve the uniformity of cleanable air supply in metro vehicles. Method The airflow organization inside the air supply ducts is simulated numerically by computational fluid dynamics (CFD). The internal structure of the ducts is optimized, and a set of full-size air supply duct is fabricated for air-conditioning and duct matching tests. Result & Conclusion The overall variation trend of the airflow quantities predicted by numerical simulation is consistent with that of the experimental-measurement results. After adding baffle, the uniformity of air supply significantly improved, with deviations between predicted and test airflow quantities at over 80% outlets within 15%, and the rest between 15% and 20%. Additionally, the issue of air reversal at outlets adjacent to the inlets is alleviated, thereby validating the reliability of the numerical simulation calculations.

Keywords

• metro vehicle
• cleanable uniform air supply duct
• numerical simulation