Large-eddy simulation study on cycle-to-cycle variation of knocking combustion in a spark-ignition engine

Chen, Ceyuan; Pal, Pinaki; Ameen, Muhsin; Feng, Dengquan; Wei, Haiqiao

doi:10.1016/j.apenergy.2019.114447

Large-eddy simulation study on cycle-to-cycle variation of knocking combustion in a spark-ignition engine

Journal Article · Tue Jan 28 00:00:00 EST 2020 · Applied Energy

DOI:https://doi.org/10.1016/j.apenergy.2019.114447· OSTI ID:1599164

Chen, Ceyuan ^[1]; ^[2]; Ameen, Muhsin ^[2]; Feng, Dengquan ^[2]; ^[1]

Tianjin Univ. (China). State Key Lab. of Engines
Argonne National Lab. (ANL), Argonne, IL (United States)

The cycle-to-cycle variation in the knock intensity is commonly encountered under abnormal combustion conditions. The severity of these abnormal combustion events can vary significantly, and the efficiency of engines at high loads is limited in practice by heavy knocking phenomena. Since, a thorough analysis of such recurrent but non-cyclic phenomena via experiments alone becomes highly cumbersome, in the present work, a multi-cycle large-eddy simulation study was performed to quantitatively predict cyclic variability in the combustion process and cyclic knock intensity variability in a direct injection spark-ignition engine. To account for the turbulence-chemistry interaction effects on flame propagation, the G-equation combustion model was used. Detailed chemistry was solved outside the flame front with a toluene primary reference fuel skeletal kinetic mechanism. For both the mild knock and heavy knock conditions, the numerical results were validated against experimental measurements. Based on the simulation results, a correlation analysis was performed considering combustion phasing, peak cylinder pressure and maximum amplitude of pressure oscillation. Furthermore, a detailed three-dimensional spatial analysis illustrated the evolution of auto-ignition kernel development and propagation of pressure waves during knocking combustion for three typical cycles with different knock intensities. In this process, it was found that an early occurrence of auto-ignition in the end gas was prone to high knock intensity. Although multiple auto-ignition kernels were observed in different cycles, the degree of coupling between chemical heat release and pressure waves varied, thereby leading to different maximum amplitude of pressure oscillation values.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1599164

Alternate ID(s):: OSTI ID: 1703587

Journal Information:: Applied Energy, Journal Name: Applied Energy Journal Issue: C Vol. 261; ISSN 0306-2619

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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42 ENGINEERING
auto-ignition
cycle-to-cycle variation
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large-eddy simulation
pressure oscillation

Large-eddy simulation study on cycle-to-cycle variation of knocking combustion in a spark-ignition engine

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