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

Applied Sciences

Josep Gomez-Soriano¹  JoséRamón Serrano¹  PabloJosé Martinez-Hernandiz¹  Ricardo Novella¹ 

[1] CMT-Motores Térmicos, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain;

关键词: gasoline PPC concept;    2-stroke engine;    knocking combustion;    CFD modelling;    cycle-to-cycle variation;   

DOI  :  10.3390/app8101707

来源: DOAJ

【 摘 要 】

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 − ε 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.

【 授权许可】

Unknown