Abstract
Interest in alternative and renewable energy sources has risen significantly in recent years. Biogas is a prime example of a promising, alternative fuel that might be a possible replacement for fossil fuels. It is a mixture consisting mainly of CH4 and CO2 with various additions. Biogas is easily storable and as such is a more reliable and stable source of energy than solar and wind sources, which suffer from unreliability due to their dependence on weather conditions. In this paper, the authors report experimental results of detonation of a biogas-oxygen mixture. The composition of the biogas was 70% CH4 + 30% CO2 and the experiments were carried out for a range of equivalence ratios (Φ = 0.5 ÷ 1.5) and initial pressures (0.6 ÷ 1.6 bar). The aim of the research was to analyze the cellular structure of detonation. The soot foil technique was used to determine the width of the detonation cells (λ). The conducted experiments and subsequent analysis of the detonation cell size confirm that both the increase in the initial pressure of the mixture or move away from stoichiometric (Φ = 1) composition is accompanied by a decrease in the width of the detonation cell. The authors also argue that due to the unstable cellular structure of the detonation, it is insufficient to report only the average cell size. Instead, the researchers propose more detailed statistical description assured values.
Highlights
Climate change concerns have been very much in the forefront in the international scientific community for a number of years
Detonation velocity increases with the increasing initial pressure of the combustible mixture and equivalence ratio
From all experiments was 0.191, and the standard deviation was 0.027. These results indicate that absolute variation increases with increasing cell size, the relative variation stays roughly the same throughout the different cases, meaning that the increase in variation comes only from the increase in detonation cell and it is not caused by any kind of methodological error or interaction between experiment’s parameters
Summary
Climate change concerns have been very much in the forefront in the international scientific community for a number of years. This is reflected in growing research efforts in the field of alternative and renewable fuels and energy production with low or no impact on the environment. It is well known that living standards are high in countries with high industrial output and intense energy use, but for this to happen energy is needed, and most of it is obtained from fossil fuels (coal, oil and natural gas) [4].
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