Formation of soot spike in n-dodecane spray combustion

Min Zhang*, Jiun Cai Ong, Kar Mun Pang, Xue-Song Bai, Jens Honore Walther

*Corresponding author for this work

Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

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Abstract

Numerical simulations are conducted to identify the underlying mechanism that governs the early soot evolution process in n-dodecane spray ames at 21% O2 level. The early evolution of soot mass, in particularly the soot spike phenomenon, is captured in the present large eddy simulation (LES) case, but not in the Unsteady Reynolds Averaged Navier- Stokes (URANS) case. Hence, a comparison of simulation results from LES and URANS is conducted to provide a better insight of this phenomenon. LES is shown to predict a rapid increasing in soot mass during the early stage of soot formation due to having a large favorable region for soot formation (equivalence ratio > 1:5 and local temperature > 1800 K). This favorable region increases and then decreases to reach a quasi-steady state in LES, while it continues to increase in URANS during the early time. In addition, the formation rate does not increase continuously as soot precursor reaches a plateau, whereas oxidation rate continues to increase signicantly in LES due to the ever increasing oxidizing species. This leads to a relatively dominant soot oxidation process over the soot formation process, which consequently results in the formation of soot spike in the LES case.
Original languageEnglish
Publication date2020
Number of pages1
Publication statusPublished - 2020
Event73rd Annual Meeting of the American Physical Society, Division of Fluid Dynamics (APS DFD 2020) - Virtual event, Chicago, United States
Duration: 22 Nov 202024 Nov 2020

Conference

Conference73rd Annual Meeting of the American Physical Society, Division of Fluid Dynamics (APS DFD 2020)
LocationVirtual event
CountryUnited States
CityChicago
Period22/11/202024/11/2020

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