Numerical Simulation Research Of Air-flow Organization And Thermal Comfort Study In Summer For Subway Carriages

The thermal comfort of passengers in subway carriages is mainly affected by the environment inside the carriages, which is mainly reflected in the temperature and velocity field. Both of them are mainly determined by the inletting parameters of air conditioning and air-flow organization of the carriages, so it is important to study the air-flow organization in subway carriages. The numerical simulation method is intuitive and effective, which is suitable for the study of the air-flow distribution in subway carriages.The simulation of air-flow organization and thermal comfort of passengers in the middle compartment of a B type metro vehicle in summer in city A are studied in this paper. By measuring the carriage with relevant instruments, the temperature and wind speed of each point can be obtained. Compared with the results simulated with RNG turbulence model by using Airpak software in the same inletting parameters, we can see the error of the results is within 15%, which is considered to meet the requirements of engineering calculation. So Airpak software can be used to research air-flow organization of subway carriages.In this paper, a subway carriage model of 296 people is established under full load condition. Simulate and analysis the simulation results in different air supply temperature, velocity and angle. At the same time, evaluate the results with PMV, Kt, Ku and ADPI indexes. The influence of air supply temperature, velocity and angle on the air distribution in the carriage is analysed and suggestions on air supply parameters under full load condition are also put forward.In this paper, an optimization method is put forward, which arranges the air outlet under the seats. Compared with the original scheme and evaluate the results with Kt, Ku andηindexes, we can draw the conclusion that the optimization scheme can effectively improve the original one not only in temperature field, velocity value, but also in the energy utilization.In this paper, it is proved that the method of numerical simulation used by Airpak software is feasible to study and evaluate the air-flow in subway carriages. The study provides a guiding suggestion for reasonable design of air-flow organization in subway carriages.