Stochastic modeling of unsteady extinction in turbulent non-premixed combustion

Journal Article · Tue Jul 19 00:00:00 EDT 2016 · Proceedings of the Combustion Institute

DOI:https://doi.org/10.1016/j.proci.2016.07.014· OSTI ID:1275513

Lackmann, T. ^[1]; Hewson, J. C. ^[2]; Knaus, R. C. ^[2]; Kerstein, A. R. ^[3]; Oevermann, M. ^[1]

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1. Chambers Univ. of Technology, Gothenburg (Sweden)
2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
3. Consultant, Danville, CA (United States)

Turbulent fluctuations of the scalar dissipation rate have a major impact on extinction in non-premixed combustion. Recently, an unsteady extinction criterion has been developed (Hewson, 2013) that predicts extinction dependent on the duration and the magnitude of dissipation rate fluctuations exceeding a critical quenching value; this quantity is referred to as the dissipation impulse. Furthermore, the magnitude of the dissipation impulse corresponding to unsteady extinction is related to the difficulty with which a flamelet is exintguished, based on the steady-state S-curve.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: AC04-94AL85000
• OSTI ID: 1275513
• Alternate ID(s): OSTI ID: 1413160
• Report Number(s): SAND-2016-7105J; PII: S154074891630270X
• Journal Information: Proceedings of the Combustion Institute, Journal Name: Proceedings of the Combustion Institute; ISSN 1540-7489
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
extinction
unsteady flames
non-premixed flame
scalar dissipation rate
turbulence