Analysis of ducted fuel injection at high-pressure transcritical conditions using large-eddy simulations

Guo, Jack; Brouzet, Davy; Chung, Wai Tong; Ihme, Matthias

doi:10.1177/14680874231170659

Analysis of ducted fuel injection at high-pressure transcritical conditions using large-eddy simulations

Journal Article · Wed Apr 26 00:00:00 UTC 2023 · International Journal of Engine Research

DOI:https://doi.org/10.1177/14680874231170659· OSTI ID:1971707

^[1]; Brouzet, Davy ^[1]; ^[1]; ^[2]

Department of Mechanical Engineering, Stanford University, Stanford, CA, USA
Department of Mechanical Engineering, Stanford University, Stanford, CA, USA, Department of Photon Science, SLAC National Accelerator Laboratory, Menlo Park, CA, USA

Ducted fuel injection (DFI) is a proposed fuel injection concept for achieving substantial reductions in emissions. In this concept, the fuel is injected through a coannular duct, resulting in increased fuel-air mixing and minimized formation of soot and other unwanted combustion products. Apart from comprehensive experimental investigations on DFI, so far computational studies have been limited to single-point Reynolds-averaged Navier Stokes simulations. Therefore, the objective of this work is to complement these studies by performing large-eddy simulations using a diffuse-interface method to examine the physical mechanisms and combustion processes of DFI, specifically focusing on the mixing process and the effect of fuel-ducting on combustion and pollutant emissions. To this end, finite-rate chemistry simulations are performed of the DFI configuration corresponding to the Engine Combustion Network Spray A injector at transcritical conditions (n-dodecane fuel, 60 bar pressure and 1000 K temperature chamber conditions). A two-equation soot model is employed for the qualitative analysis of soot emissions. Direct comparisons of averaged and instantaneous flow field results with the Spray A configuration are performed to assess the effect of DFI on the first- and second-stage ignition and soot formation. Compared to the free-spray condition, the results show that the DFI case exhibits a combination of (i) increased mass flow rate and entrained air, (ii) larger pressure drop magnitude and flow velocity, and (iii) a closer-to-stoichiometric mixture composition (both globally and locally), each of which is conjectured to contribute toward reduced soot production.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC02-76SF00515; EE0008875; NA0003968

OSTI ID:: 1971707

Alternate ID(s):: OSTI ID: 2001443

Journal Information:: International Journal of Engine Research, Journal Name: International Journal of Engine Research Journal Issue: 2 Vol. 25; ISSN 1468-0874

Publisher:: SAGE PublicationsCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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