Investigation of the ignition processes of a multi-injection flame in a Diesel engine environment using the flamelet model

Wen, Xu; Rieth, Martin; Han, Wang; Chen, Jacqueline H.; Hasse, Christian

doi:10.1016/j.proci.2020.05.057

Investigation of the ignition processes of a multi-injection flame in a Diesel engine environment using the flamelet model

Journal Article · Mon Aug 24 00:00:00 EDT 2020 · Proceedings of the Combustion Institute

DOI:https://doi.org/10.1016/j.proci.2020.05.057· OSTI ID:1670189

^[1]; Rieth, Martin ^[2]; Han, Wang ^[1]; ^[2]; ^[1]

Technical Univ. of Darmstadt (Germany)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)

In this paper, the first flamelet analysis is conducted of a highly resolved DNS of a multi-injection flame with both auto-ignition and ignition induced by flame-flame interaction. A novel method is proposed to identify the different combustion modes of ignition processes using generalized flamelet equations. The state-of-the-art DNS database generated by Rieth et al. (US National Combustion Meeting, 2019) for a multi-injection flame in a Diesel engine environment is investigated. Three-dimensional flamelets are extracted from the DNS at different time instants with a focus on auto-ignition and interaction-ignition processes. The influences of mixture field interactions and the scalar dissipation rate on the ignition process are investigated by varying the species composition boundary conditions of the transient flamelet equations. Budget analyses of the generalized flamelet equations show that the transport along the mixture fraction iso-surface is insignificant during the auto-ignition process, but becomes important when interaction-ignition occurs, which is further confirmed through a flamelet regime classification method.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office; German Research Foundation (DFG)

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1670189

Alternate ID(s):: OSTI ID: 2472452

Report Number(s):: SAND--2020-6525J; 686922

Journal Information:: Proceedings of the Combustion Institute, Journal Name: Proceedings of the Combustion Institute Journal Issue: 4 Vol. 38; ISSN 1540-7489

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Investigation of the ignition processes of a multi-injection flame in a Diesel engine environment using the flamelet model

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