A comprehensive experimental and modeling study of the ignition delay time characteristics of ternary and quaternary blends of methane, ethane, ethylene, and propane over a wide range of temperature, pressure, equivalence ratio, and dilution

The ignition delay time (IDT) characteristics of new ternary and quaternary blended C-1 - C-3 gaseous hydrocarbons, including methane/ethane/ethylene and methane/ethane/ethylene/propane, are studied over a wide range of mixture composition, temperature (similar to 800 - 2000 K), pressure (similar to 1 - 135 bar), equivalence ratio (similar to 0.5 - 2.0), and dilution (similar to 75 - 90%) using both experimental data and kinetic modeling tools. In this regard, all of the experimental tests were designed using the Taguchi approach (L-9) to fulfill the experimental matrix required to generate a comprehensive set necessary to validate a detailed chemical kinetic model. High- and low-temperature IDTs were recorded using low/high-pressure shock tubes (L/HPST) and rapid compression machines (RCM), respectively. The model predictions using NUIGMech1.2 are evaluated versus all of the newly recorded experimental data. Moreover, the individual effects on IDT predictions of the parameters studied, including mixture composition and pressure, are investigated over the temperature range. The results show that NUIGMech1.2 can reasonably reproduce the experimental IDTs over the wide range of the conditions studied. The constant-volume simulations using the chemical kinetic mechanism reveal the synergistic/antagonistic effect of blending on IDTs over the studied temperature range so that IDTs in certain temperature ranges are very sensitive to even small changes in mixture composition. (C) 2021 The Authors. Published by Elsevier Inc. on behalf of The Combustion Institute.

Automated summary

The ignition delay time (IDT) characteristics of new ternary and quaternary blended C-1 - C-3 gaseous hydrocarbons were studied over a wide range of conditions using experimental data and kinetic modeling tools. The results showed that the NUIGMech1.2 model could reasonably reproduce experimental IDTs and revealed the synergistic/antagonistic effect of blending on IDTs over different temperature ranges. The study was published by Elsevier Inc. on behalf of The Combustion Institute in 2021.