Computational Methodology for Knocking Combustion Analysis in Compression-Ignited Advanced Concepts

[EN] In the present work, a numerical methodology based on three-dimensional (3D) computational fluid dynamics (CFD) was developed to predict knock in a 2-Stroke engine operating with gasoline Partially Premixed Combustion (PPC) concept. Single-cycle Unsteady Reynolds-Averaged Navier Stokes (URANS) simulations using the renormalization group (RNG) k - epsilon model were performed in parallel while the initial conditions are accordingly perturbed in order to imitate the variability in the in-cylinder conditions due to engine operation. Results showed a good agreement between experiment and CFD simulation with respect to cycle-averaged and deviation of the ignition timing, combustion phasing, peak pressure magnitude and location. Moreover, the numerical method was also demonstrated to be capable of predicting knock features, such as maximum pressure rise rate and knock intensity, with good accuracy. Finally, the CFD solution allowed to give more insight about in-cylinder processes that lead to the knocking combustion and its subsequent effects.The work has been partially supported by the Spanish Ministerio de Economia y Competitividad through grant number TRA2016-79185-R. The equipment used in this work has been partially supported by FEDER project funds "Dotacion de infraestructuras cientifico tecnicas para el Centro Integral de Mejora Energetica y Medioambiental de Sistemas de Transporte (CiMeT), (FEDER-ICTS-2012-06)" from the operational program of unique scientific and technical infrastructure of the Spanish Ministerio de Economia y Competitividad. In addition, J. Gomez-Soriano is partially supported by an FPI contract (FPI-S2-2016-1353) of the "Programa de Apoyo para la Investigacion y Desarrollo (PAID-01-16)" of the Universitat Politecnica de Valencia.Serrano, J.; Novella Rosa, R.; Gómez-Soriano, J.; Martínez-Hernándiz, PJ. (2018). 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