Test and Improvement of Ventilation Cooling System for High-Speed Train

In order to solve the poor ventilation for EMU (electric multiple units) after the train speed increasing, the air pressure, air flux and temperature of the inlets and outlets for important equipments were measured through full-scale train test, and some corresponding improvements were made. The test results show that equipments work normally in the beginning and the air flux and temperature are in the design value. After the train running a period of time, the inlets are jammed, cooling air flux is insufficient and the temperature of outlets increases with the rubbish entering the inlets of equipments. The rubbish jammed in the inlets includes catkin, wastepaper and dust, entering the equipment storage mainly through the observing holes, technological holes and the gaps. The key way to solve the problem is to seal the holes and gaps mentioned above, and to improve the filtration net so as to prolong the period of cleaning up and replacing and reduce the workload.