In the present paper, a three-dimensional (3D) internal flow field model of an
electronic unit pump (EUP) fuel system oil drainage progress was established,
including solenoid valve model, control valve model, high-pressure oil passage,
and the plunger cavity model. From the microscopic point of view, the flow
characteristics, such as pressure, velocity, and turbulence kinetic energy, are
analyzed by using Fluent. This paper uses the combination of one-dimensional
(1D) software AMESim and 3D software Fluent to achieve the purpose. The pressure
curve of the high-pressure pipe is extracted from the control valve module of
the 1D EUP fuel system model, and the velocity curve of the plunger movement is
extracted from the plunger pump module. The two sets of curves are dynamically
linked to the flow field calculation with a User-Defined Function (UDF), and the
flow field change of the single pump fuel system control valve is calculated by
Fluent. Using the dynamic grid technology to achieve the movement of the spool
and plunger, the results show that the pressure at the same time is higher in
the region with higher boundary pressure, and the pressure value of the
low-pressure oil chamber is almost the same. The larger the diameter of the seal
the greater the turbulence intensity of the head of the flow field. The change
of the sealing cone angle affects the width and width of the slit gap during the
opening of the spool, thus affecting the circulation performance.