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In order to study the difference of gas flow state in front and rear train air brake system caused by pressure drop transfer time and pressure drop wave attenuation due to resistance during braking of heavy duty train, the 3D CAD model of the 120 type control valve was established using SOLIDWORKS software, based on the actual size. Train No. 42 and No. 56 were taken as examples (2DF8B + 54C80 + 2HXN3). By applying the operational principles of the type 120 control valve, the flow field during its first stage, second stage, and auxiliary cylinder brake stage were extracted. Pressure boundary conditions for both front and back train pipes were sequentially loaded into the flow field along with a Reliable \(k - \varepsilon\) turbulence model. In this paper, the differences in the control valve, auxiliary air cylinder and gas state parameters in the brake cylinder caused by the different positions of the front and rear trains are studied, which provides guidance for modeling and longitudinal impulse calculation of train air brake system.

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Analysis of the Influence of Braking Performance in Different Positions of Heavy Duty Train

  • 会议论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年

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  • Jixian Zhao,
  • Chunjun Chen,
  • Liquan Song

摘要

In order to study the difference of gas flow state in front and rear train air brake system caused by pressure drop transfer time and pressure drop wave attenuation due to resistance during braking of heavy duty train, the 3D CAD model of the 120 type control valve was established using SOLIDWORKS software, based on the actual size. Train No. 42 and No. 56 were taken as examples (2DF8B + 54C80 + 2HXN3). By applying the operational principles of the type 120 control valve, the flow field during its first stage, second stage, and auxiliary cylinder brake stage were extracted. Pressure boundary conditions for both front and back train pipes were sequentially loaded into the flow field along with a Reliable \(k - \varepsilon\) turbulence model. In this paper, the differences in the control valve, auxiliary air cylinder and gas state parameters in the brake cylinder caused by the different positions of the front and rear trains are studied, which provides guidance for modeling and longitudinal impulse calculation of train air brake system.