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• W3204709619 endingPage "122046" @default.
• W3204709619 startingPage "122046" @default.
• W3204709619 abstract "In the study, a three-dimensional CFD simulating model coupling with reasonable turbulent model and reduced chemical kinetic mechanism was established and validated. The auto-ignition development and knocking characteristics of a downsized spark-ignition (SI) gasoline rotary engine (RE) under different boosted conditions were numerically investigated. Results showed that as inlet pressure increased from 1.12 bar to 1.16 bar, the knocking intensity (KI) of the RE was enhanced gradually, and the knocking onset was advanced. However, with the further augment of inlet pressure, the KI did not further increase due to the larger heat dissipation loss caused by high turbulent kinetic energy in the long and narrow combustion chamber of the RE. This indicated that the structure of the downsized SI RE had a certain ability of knocking suppression when inlet pressure was sufficiently boosted. The KI of the RE was more serious in the trailing part of the combustion chamber as compared to other positions due to the unidirectional flow field, especially on both sides near the end cover in the trailing part of the combustion chamber. Therefore, it was concluded that strengthening the cooling of both sides near the end cover in the trailing part of the combustion chamber may be an effective way to reduce the KI of a downsized boosted SI RE. In addition, the KI is closely related to auto-ignition development processes, e.g. end-gas auto-ignition modes. Under the mass fraction of unburned mixtures at the moment of end-gas auto-ignition, the local KI caused directly by single hot-spot auto-ignition was higher than that caused by multiple hot-spots auto-ignitions, and the local KI caused by homogeneous auto-ignition was higher than that caused by multiple hot-spots auto-ignitions. • Knocking characteristics of a downsized boosted RE were analyzed numerically. • Knock occurred in the trailing part of the combustion chamber of a rotary engine. • Structure of the downsized RE had a certain ability of knocking suppression. • KI was mainly depended on the auto-ignition mode under same unburnt mass fraction. • Homogeneous auto-ignition could lead to higher KI." @default.
• W3204709619 created "2021-10-11" @default.
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• W3204709619 date "2022-02-01" @default.
• W3204709619 modified "2023-10-17" @default.
• W3204709619 title "Numerical study on auto-ignition development and knocking characteristics of a downsized rotary engine under different inlet pressures" @default.
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• W3204709619 doi "https://doi.org/10.1016/j.fuel.2021.122046" @default.
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