Abstract
This article analyses the cause of the freezing phenomenon on the tip and body of the end part of the injector (EPI) assembly in a LPG injection system. Based on the physical properties of LPG, fuel injection conditions, environmental conditions, material parameters, shape and size of the EPI of the LPG injector assembly, and thermodynamic process taking place in the EPI tube, we established a calculation model to determine the pressure course of LPG in the tube. Results of the pressure courses measured in the experiment and calculation model have proven to be similar. The calculation model showed that it was not possible to manufacture an EPI using changes in material, shape and size to completely eliminate freezing. However, adjusting input parameters for EPI size and shape enabled us to determine the optimal geometry of the EPI and showed the need for a heating element device to deal with freezing on the tip and body of the EPI. An experiment on the EPI with a heating element device demonstrated the effectiveness of this solution.
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