Papers presented to the 11th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 20-23 July 2015.
The impinging jet is regarded as a method of achieving
high convective heat transfer coefficients and therefore
enhancing the heat transfer from the inner shell of the piston,
particularly from the impingement and its neighboring regions.
In this study, a transient numerical investigation has been
carried out to evaluate the piston cooling process due to oil jet
impingement. The volume of fluid method utilizing a high
resolution interface capturing scheme was used to perform the
two-phase (air-oil) simulations. The governing 3D Navier-
Stokes equations and energy equation are numerically solved
using a finite volume discretization. The conjugate heat transfer
method is used to obtain a coupled heat transfer solution
coefficient. Two engine speeds are used in the simulations,i.e.,
when the engine is operating at a normal condition (2000 rpm)
and when the engine is operating at a full load
condition (6000 rpm). It is shown that the cooling jet can
considerably decrease the volume and surface average
temperature of the piston.