Combustion of N-Decane+air Mixtures To Investigate Laminar Burning Velocity Measurements At Elevated Temperatures

ABSTRACT

The combustion characteristics of n-decane+air mixtures are experimentally investigated through laminar burning velocity measurements at 1 atm pressure and higher initial temperatures using an externally heated diverging channel (EHDC) method. Up to 610 K mixture temperature over an equivalence ratio range of 0.7–1.4, laminar burning velocities are reported with an accuracy of ± 5%. The current measurements exhibit a good match with existing experimental measurements, and agree closely with the predictions of Zhao, LLNL and PoliMi mechanisms at different mixture temperatures. The present measurements show an excellent match of temperature exponent (α) variation with equivalence ratio (ϕ) with the predictions of distinct kinetic models as well as experimental measurements. This study reveals that a substantial scatter exists among the predictions of different kinetic models. A variation of 20–30 cm/s in the burning velocity is observed at 610 K mixture temperature. Reaction R16 (H + HO₂ = H₂ + O₂), which inherently reduces the burning velocity becomes insignificant at an elevated mixture temperature of 610 K, and the reaction R15 (H + HO₂ = 2OH) plays a dominant role in accelerating the flame propagation. From reaction pathway diagrams, it is clear that a higher burning velocity at 610 K is associated with the increased reaction rate. The elemental-flux value associated with the formation of C₂H₃ from C₂H₄ at 610 K mixture temperature is ≅34% higher in comparison to the 470 K mixture temperature.

KEYWORDS:

• Surrogate fuel
• n-decane
• laminar burning velocity
• elevated temperatures

Disclosure statement

No potential conflict of interest was reported by the author(s).

Supplementary material

Supplemental data for this article can be accessed online at https://doi.org/10.1080/00102202.2022.2119083