Toward predictive CFD models for advanced compression-ignition engines: Accounting for unresolved turbulent fluctuations

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In-cylinder aero-thermal-chemical processes in reciprocating-piston internal combustion engines are rich and complex, and modern engines are already at high levels of refinement. Further increases in performance, reductions in fuel consumption and emissions, and accommodation for nontraditional fuels will require the effective use of high-spatial-and-temporal-resolution optical diagnostics and numerical simulations. CFD-based models must deal with mixed-mode turbulent combustion under largely unexplored thermochemical conditions, and must capture subtle influences of fuel composition on efficiency and emissions. For the models to be truly predictive, a proper accounting for the influences of unresolved turbulent fluctuations is required to capture complex interactions among hydrodynamic turbulence, gas-phase chemistry, dispersed liquid and/or solid phases (e.g., fuel sprays and/or soot) and radiation heat transfer. Transported probability density function (PDF) methods have emerged as one of the most promising and powerful frameworks for accommodating the effects of turbulent fluctuations in both Reynolds-averaged and large-eddy simulations. Within this framework, examples illustrating the importance of turbulence-chemistry-soot-radiation interactions (TCSRI) in laboratory flames and engines are presented and discussed. The ability of PDF-based models to accommodate realistic chemistry, detailed soot models, spectral radiation treatments and TCSRI is demonstrated.

Original languageEnglish (US)
Title of host publicationFall Technical Meeting of the Eastern States Section of the Combustion Institute 2013
PublisherCombustion Institute
Pages495-500
Number of pages6
ISBN (Electronic)9781629937199
Publication statusPublished - Jan 1 2013
EventFall Technical Meeting of the Eastern States Section of the Combustion Institute 2013 - Clemson, United States
Duration: Oct 13 2013Oct 16 2013

Publication series

NameFall Technical Meeting of the Eastern States Section of the Combustion Institute 2013

Other

OtherFall Technical Meeting of the Eastern States Section of the Combustion Institute 2013
CountryUnited States
CityClemson
Period10/13/1310/16/13

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All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry

Cite this

Haworth, D. C. (2013). Toward predictive CFD models for advanced compression-ignition engines: Accounting for unresolved turbulent fluctuations. In Fall Technical Meeting of the Eastern States Section of the Combustion Institute 2013 (pp. 495-500). (Fall Technical Meeting of the Eastern States Section of the Combustion Institute 2013). Combustion Institute.