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Effect of Fuel Sensitization on NOx Emissions from a Synthetic Biofuel under Detonating Conditions

AIAA 2022-0518
Session: Parametric Effects on RDE Operation
Published Online:https://doi.org/10.2514/6.2022-0518
Abstract:

View Video Presentation: https://doi.org/10.2514/6.2022-0518.vid

Fuel-sensitization is one of the possible techniques that ensure the operation of a detonation-based combustor near its limits without the risk of failure or attenuation of a detonation wave. The primary effect of fuel sensitization is to alter the ignition chemistry of the fuel-air mixture without affecting the other thermodynamic and gas dynamic properties of gaseous detonation. The chemical kinetics of biofuels is relatively slow for their application in detonation-based engines. Ignition promoters like ozone and hydrogen peroxide could improve the ignition and combustion kinetics of synthetic biofuels tremendously for applications in ramjets and detonation-based engines. However, ignition promoters are strong oxidizing agents and could lead to larger NOx emissions. Therefore, the effect of fuel-sensitization on NOx emissions from a synthetic biofuel under detonation conditions is investigated in the present study. In the present study, one-dimensional ZND calculations are carried out for C1-air detonations with ozone and hydrogen peroxide as ignition promoters where C1 is an alcohol-to-jet synthetic biofuel. The effect of ignition promoters on the emission characteristics and the critical detonation parameters is studied over a range of equivalence ratios. It is observed that while ozone is a better ignition promoter and reduces the length and time scales drastically, it leads to larger NOx emissions when compared to hydrogen peroxide. Hydrogen peroxide exhibits a dual behavior. It acts both as an ignition promoter and a NOx mitigating agent. The dual nature of hydrogen peroxide can be harnessed for its practical application in detonation-based combustors. The results from the present study are promising and can be used as a starting point to efficiently utilize synthetic biofuels for detonation-based combustors.