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.
Highlights
According to the U.S Energy Information Administration (EIA) report 2019 [1], it is projected that global energy consumption will increase by approximately 28% in 2050 compared to 2018 levels, with fossil fuels providing approximately 77% of the total energy demand
The current study aims to address the lack of data for mixtures by providing ignition delay time (IDT) data for binary C2H4/C3H8 and C2H6/C3H8 blends over a wide range of temperatures, pressures, equivalence ratios, and dilutions relevant to engine and gas turbine conditions
All of the experimental results for the ethane/propane (C2H6/C3H8) and ethylene/propane (C2H4/C3H8) blends are presented in Section 4.1 together with simulations using NUIGMech1.1 and AramcoMech3.0 [52]
Summary
According to the U.S Energy Information Administration (EIA) report 2019 [1], it is projected that global energy consumption will increase by approximately 28% in 2050 compared to 2018 levels, with fossil fuels providing approximately 77% of the total energy demand. Natural gas, and coal are the most important sources amongst all fossil fuels. Liquid fuels, such as gasoline, diesel, etc. It is necessary to improve the efficiency of combustion systems for which a detailed understanding of the controlling chemistry is essential. The oxidation kinetics of small hydrocarbons plays an important role as the base of any mechanism for alternative fuels. For these reasons, the combustion community is interested in enhancing our understanding of the chemistry controlling the oxidation of hydrocarbons to increase the efficiency of engines and to reduce emissions of pollutants such as soot, NOx, UHCs (unburned hydrocarbons), and greenhouse gases in general. A hierarchical [3,4,5,6] (bottom-up) strategy has proven to be a good way to develop reliable chemical kinetic mechanisms and improve our understanding of the chemistry controlling pyrolysis and oxidation
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