The Research of Supercooled Boiling in Bridge Zone of Cylinder Head 2015-01-0346
Due to the latent heat of vaporization, the efficiency of boiling heat transfer is several times and even dozens of times higher than that of the convection heat transfer. With the improvement of power density of the engine, there are more requirements for engine cooling system design. It has been confirmed that the subcooled boiling did exist in the engine cooling. If boiling heat transfer can be reasonablely used, we can achieve the objective of enhancing heat transfer without changing the existing structure. In this paper, in order to quantitatively research the subcooled boiling in the engine, we simulated the subcooled boiling in the analog channel with the Euler multiphase model, found the importance of the turbulent dispersion. In additon, we explored the applicability of existing models to subcooled boiling, and compared the results with the experiment. Finally, we simulated the supercooled boiling through the Euler boiling model and the mixture model in the bridge zone of cylinder head, Confirmed the conclusion that the Euler multiphase boiling model should be separated three part in whole boiling process. In general, the Euler multiphase boiling model have more accuracy than the mixture model.