Numerical simulation and experimental study on air charging characteristics of train's air-pipe system

Based on the perfect gas equation of state and the mass flow equation, We consider the train pipe as a corresponding equivalent wind cylinder to study the pressure change between the gas chambers, and to solve the numerical simulation programs to deduce the basic models of train pipe. The train pipe pressure change model which describes the relationship between the train pipe boosting speed and vehicle position is determined. The initial inflatable data of different marshalling cars were collected basing on the establishment of a test bed and compared with the simulation results, therefore the accuracy of train pressure change models were verified. This study is an important part of the research on the air-braking system of freight trains, which can provide references for the research and improvement of long trains' air-braking system.