employee from 01.01.2023 to 01.01.2025
Saint Petersburg, St. Petersburg, Russian Federation
Russian Federation
employee from 01.01.2024 to 01.01.2025
Saint Petersburg, St. Petersburg, Russian Federation
Purpose: To establish the regularities of the condensation process of moist atmospheric air in the closed pneumatic system and the connecting fittings of railway rolling stock after its compression in a compressor unit. To analyze the ratio of outdoor air temperature, pneumatic system and dew point temperature in the main modes of rolling stock operation. To assess the degree of moisture formation inside the pipelines of the pneumatic brake system of railway rolling stock in the researched temperature ranges. Methods: Algorithm for investigating moisture condensation processes in the pneumatic network of railway rolling stock; comparison of calculated dew point values and surface temperature of nodes of the pneumatic network of traction rolling stock for the operating range of outdoor temperatures depending on the relative humidity of atmospheric air. Results: The mechanism of moisture formation on the inner surface of the main tanks and connecting fittings has been theoretically investigated, depending on changes in meteorological conditions, and its possible negative impact on the safety and efficiency of rolling stock operation has been assessed. Using the theoretical foundations of thermodynamics and heat transfer, calculations were carried out and a diagram of the ratio of atmospheric air temperatures, dew points and the surface of pneumatic network devices was compiled. Using the compiled diagram, the temperature ranges of atmospheric air and the inner surface of the train’s pneumatic system units were zoned, and temperature zone boundaries and relative humidity levels at which moisture formation could not negatively affect the safety and efficiency of rolling stock operation were determined. Practical significance: The studied patterns were adapted to select and test the device parameters for compressed air prepared to the required relative humidity and dew point temperature. The visual representation of the data obtained will also improve the quality of testing of drying installations that have undergone current and major repairs by comparing the dew point level and the current atmospheric and meteorological parameters of the region of operation
Compressed air drying, compressor unit, dew point temperature, steam partial pressure, relative humidity, thermodynamics and heat transfer
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