Abstract
As one of the key components of the common rail system, the accuracy of pressure field and velocity field analysis of the common rail pipe is related to the service reliability. In order to obtain the velocity and pressure distribution that difficult to be measured in the experiment, this paper considers using three-dimensional modeling and establishing the three-dimensional model of oil flow in the common rail pipe based on the fluid simulation software, and then obtains the velocity field and pressure field distribution of the common rail pipe through numerical simulation. The cone angle at the nozzle structure of common rail pipe is compared and analyzed. Meanwhile the most appropriate cone angle’s processing angle among the commonly used processing cone angles is obtained, which improves the rationality of common rail pipe structure processing. It is great significance to the subsequent rail pressure stabilization analysis of common rail pipe.
Highlights
Common rail pipe is the most important component for fuel pressure stability, which is the symbol that the high-pressure common rail system is different from the traditional fuel supply system
The fluid domain is in high pressure environment, and the flow field at the nozzle structure is in high turbulence state, so the turbulence model should be selected as the calculation model
It can be seen from the velocity cloud chart that the maximum value of velocity change occurs in the common rail pipe when the cone angle at the nozzle structure is 60°, and the minimum value of velocity change occurs in the common rail pipe when the cone angle at the nozzle structure is 120°
Summary
Common rail pipe is the most important component for fuel pressure stability, which is the symbol that the high-pressure common rail system is different from the traditional fuel supply system. The volume of the common rail pipe, the diameter of the oil outlet and the structural form of the common rail pipe have a certain influence on the pressure stability in the common rail pipe. The research on the fuel injection characteristics of common rail pipe will be of great significance to the optimal design of its structure and the key indexes such as economy, power, emissions and reliability of engine [2,3,4]. ANSYS Workbench software is used to simulate and analyze the performance of common rail products for four cylinder gasoline engine manufactured by a fuel distributor manufacturing company. The damping hole at the high pressure oil inlet end and the nozzle structure formed at both ends are analyzed, which provides a basis for the optimization and improvement of structure
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