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Experimental and Numerical Investigation of the Multiphase Flow and Heat Transfer in an Oil Jet Cooled Engine Piston
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on April 14, 2020 by SAE International in United States
The piston temperature has to be carefully controlled to achieve effective and efficient thermal management in internal combustion engines. One of the common methods to cool piston is by injecting oil from the crankcase underside to the piston under-crown area. In the present study, a novel 3D multiphase thermal-fluid coupled model is developed using the commercial CFD software SimericsMP+ to study the piston cooling using the oil jet. In this model, an algorithm is proposed to couple the fluid and solid computation domain to account for the different timescale of heat transfer in the fluid and solid due to the high thermal inertia of the solid piston. Combustion heat flux on the piston surface and the liner temperature distribution are used as the boundary conditions. The temperature-dependent material properties, piston motion, and thermal contact resistance between the ring and piston are also accounted for. The oil film on the piston under-crown area is captured in the model to ensure an accurate prediction of the heat transfer coefficient. The piston temperature from the numerical simulation is validated against the experiment measurement at 13 different locations, and the root mean square error (RMSE) is within 13 °C. Furthermore, this study investigates the effect of oil jet temperature and oil flow rate on the piston temperature distribution. The piston cooling model developed in the current study has demonstrated to be a valuable tool in optimizing the piston design and development.