The Journal of Engine Research

The Journal of Engine Research

Developing a reduced chemical kinetic mechanism for natural gas/biodiesel mixture ‎combustion

Document Type : Original Article

Authors
1 Department of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran
2 School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
Abstract
The use of natural gas-biodiesel in LTC engines, according to their characteristics, Recently, it has attracted the attention of combustion scientific circles. Natural gas abundance, clean combustion characteristics relatively low cost among various fuels, and the renewability of biodiesel make them attractive fuel in combustion engines. In this line, various experimental tests using natural gas-biodiesel fuels have been performed until now. So for further development, the use of numerical simulations can be effective. The main problem in this way is the lack of a precise combustion mechanism for biodiesel-natural gas. In this regard, an accurate mechanism which consists of 153 species and 727 reactions is developed from two up-to-date mechanisms. For natural gas, the Drost mechanism, which consists of 49 species and 332 reactions and is considered as 90% CH4, 9% C2H6, and 1% C3H8, and for biodiesel, the Zhang mechanism with 156 species and 589 reactions has been employed, which is considered as 25% MD, 25% MD9D and 50% n-Heptane. In the development process, DRG, DRGEP, sensitivity analysis, path flux analysis, and QSSA methods are used. Comparing ignition delay times of based and developed mechanisms revealed that arithmetical mean error (AME) is 10.77% for 0%-NG and 11.2% for 0%-biodiesel, respectively. In the 1-D simulation, flame speed is calculated and the AME for 0%-biodiesel and 0%-NG is 7% and 8.3%, respectively. In the end, the RCCI engine CFD simulation is verified again to the develop mechanism appropriately.
Keywords

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Volume 71, Issue 4 - Serial Number 77
English Paper
Winter 2025
Pages 15-32

  • Receive Date 16 July 2023
  • Revise Date 19 October 2023
  • Accept Date 06 January 2024