Acta Mechanica Sinica

, Volume 31, Issue 5, pp 732–740 | Cite as

Development of efficient and accurate skeletal mechanisms for hydrocarbon fuels and kerosene surrogate

  • Fengquan Zhong
  • Sugang Ma
  • Xinyu Zhang
  • Chih-Jen Sung
  • Kyle E. Niemeyer
Research Paper
  • 144 Downloads

Abstract

In this paper, the methodology of the directed relation graph with error propagation and sensitivity analysis (DRGEPSA), proposed by Niemeyer et al. (Combust Flame 157:1760–1770, 2010), and its differences to the original directed relation graph method are described. Using DRGEPSA, the detailed mechanism of ethylene containing 71 species and 395 reaction steps is reduced to several skeletal mechanisms with different error thresholds. The 25-species and 131-step mechanism and the 24-species and 115-step mechanism are found to be accurate for the predictions of ignition delay time and laminar flame speed. Although further reduction leads to a smaller skeletal mechanism with 19 species and 68 steps, it is no longer able to represent the correct reaction processes. With the DRGEPSA method, a detailed mechanism for n-dodecane considering low-temperature chemistry and containing 2115 species and 8157 steps is reduced to a much smaller mechanism with 249 species and 910 steps while retaining good accuracy. If considering only high-temperature (higher than 1000 K) applications, the detailed mechanism can be simplified to even smaller mechanisms with 65 species and 340 steps or 48 species and 220 steps. Furthermore, a detailed mechanism for a kerosene surrogate having 207 species and 1592 steps is reduced with various error thresholds and the results show that the 72-species and 429-step mechanism and the 66-species and 392-step mechanism are capable of predicting correct combustion properties compared to those of the detailed mechanism. It is well recognized that kinetic mechanisms can be effectively used in computations only after they are reduced to an acceptable size level for computation capacity and at the same time retaining accuracy. Thus, the skeletal mechanisms generated from the present work are expected to be useful for the application of kinetic mechanisms of hydrocarbons to numerical simulations of turbulent or supersonic combustion.

Keywords

Reduced chemistry Hydrocarbons  Directed relation graph Ignition delay time 

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Copyright information

© The Chinese Society of Theoretical and Applied Mechanics; Institute of Mechanics, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Fengquan Zhong
    • 1
  • Sugang Ma
    • 1
  • Xinyu Zhang
    • 1
  • Chih-Jen Sung
    • 2
  • Kyle E. Niemeyer
    • 3
  1. 1.State Key Laboratory of High Temperature Gas Dynamics, Institute of MechanicsChinese Academy of SciencesBeijingChina
  2. 2.Department of Mechanical EngineeringUniversity of ConnecticutStorrsUSA
  3. 3.School of Mechanical, Industrial, and Manufacturing EngineeringOregon State UniversityCorvallisUSA

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