The application of jet impingement for piston cooling

Abstract

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 betweenthesolidandfluid,topredicttheheattransfer 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.