4.2 Article

Development and validation of an n-dodecane skeletal mechanism forspray combustion applications

期刊

COMBUSTION THEORY AND MODELLING
卷 18, 期 2, 页码 187-203

出版社

TAYLOR & FRANCIS LTD
DOI: 10.1080/13647830.2013.872807

关键词

flame lift-off; auto-ignition; n-dodecane; diesel spray combustion; mechanism reduction

资金

  1. National Science Foundation [0904771]
  2. Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences, Office of Science, US Department of Energy [DE-FG02-12ER16345]
  3. Office of Advanced Cyberinfrastructure (OAC)
  4. Direct For Computer & Info Scie & Enginr [0904771] Funding Source: National Science Foundation

向作者/读者索取更多资源

n-Dodecane is a promising surrogate fuel for diesel engine study because its physicochemical properties are similar to those of the practical diesel fuels. In the present study, a skeletal mechanism for n-dodecane with 105 species and 420 reactions was developed for spray combustion simulations. The reduction starts from the most recent detailed mechanism for n-alkanes consisting of 2755 species and 11,173 reactions developed by the Lawrence Livermore National Laboratory. An algorithm combining direct relation graph with expert knowledge (DRGX) and sensitivity analysis was employed for the present skeletal reduction. The skeletal mechanism was first extensively validated in 0-D and 1-D combustion systems, including auto-ignition, jet stirred reactor (JSR), laminar premixed flame and counter flow diffusion flame. Then it was coupled with well-established spray models and further validated in 3-D turbulent spray combustion simulations under engine-like conditions. These simulations were compared with the recent experiments with n-dodecane as a surrogate for diesel fuels. It can be seen that combustion characteristics such as ignition delay and flame lift-off length were well captured by the skeletal mechanism, particularly under conditions with high ambient temperatures. Simulations also captured the transient flame development phenomenon fairly well. The results further show that ignition delay may not be the only factor controlling the stabilisation of the present flames since a good match in ignition delay does not necessarily result in improved flame lift-off length prediction.

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