An experimental and kinetic modeling study of the ignition delay characteristics of binary blends of ethane/propane and ethylene/propane in multiple shock tubes and rapid compression machines over a wide range of temperature, pressure, equivalence ratio, and dilution

Sergio Martinez, Mohammadreza Baigmohammadi, Vaibhav Patel, Snehasish Panigrahy (Corresponding author), Amrit B. Sahu, Shashank S. Nagaraja, Ajoy Ramalingam, A. Abd El Sabor Mohamed, Kieran P. Somers, Karl A. Heufer, Andrzej Pekalski, Henry J. Curran

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Abstract

In this work, the ignition delay time characteristics of C2 – C3 binary blends of gaseous hydrocarbons including ethylene/propane and ethane/propane are studied over a wide range of temperatures (750 – 2000 K), pressures (1 – 135 bar), equivalence ratios (φ = 0.5 – 2.0) and dilutions (75 – 90%). A matrix of experimental conditions is generated using the Taguchi (L9) approach to cover the range of conditions for the validation of a chemical kinetic model. The experimental ignition delay time data are recorded using low- and high-pressure shock tubes and two rapid compression machines (RCM) to include all of the designed conditions. These novel experiments provide a direct validation of the chemical kinetic model, NUIGMech1.1, and its performance is characterized via statistical analysis, with the agreement between experiments and model being within ~ 26.4% over all of the conditions studied, which is comparable with a general absolute uncertainty of the applied facilities (~ 20%). Sensitivity and flux analyses allow for the key reactions controlling the ignition behavior of the blends to be identified. Subsequent analyses are performed to identify those reactions which are important for the pure fuel components and for the blended fuels, and synergistic/antagonistic blending effects are therefore identified over the wide range of conditions. The overall performance of NUIGMech1.1 and the correlations generated are in good agreement with the experimental data.

Original languageEnglish
Pages (from-to)401-414
Number of pages14
JournalCombustion and Flame
Volume228
DOIs
Publication statusPublished - Jun 2021

Bibliographical note

Funding Information:
The authors would like to express their gratitude to Science Foundation Ireland (SFI) via their Research Centre Program through project numbers 15/IA/3177 and 16/SP/3829, KAY-ICHEC via the project ngche079c, and to Shell Research Ltd. The authors from PCFC RWTH Aachen University would like to recognize the funding support from the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) through the project number – 322460823 (HE7599/2–1).

Keywords

  • Ethane
  • Ethylene
  • Ignition delay time
  • Propane
  • Rapid compression machine
  • Shock-tube

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