Emission characteristics of aviation kerosene combustion in aero-engine annular combustor with low temperature plasma assistance

Abstract

A plasma-assisted combustion test platform for annular combustor was developed to validate the feasibility of using plasma-assisted combustion actuation to reduce emission levels. Combustor outlet temperature and emission levels of O 2 , CO 2 , H 2 , CO, and NO x were measured by using a thermocouple and a Testo 350-Pro Flue Gas Analyzer, respectively. Combustor combustion efficiency was also calculated. The effects of duty ratio, feedstock air-flow rate, and actuator position on combustion efficiency and emission performance have been analyzed. The results show that the target of CO and NO x emissions reduction in plasma-assisted combustion could not be fully achieved for kerosene/air mixture with different combustor excessive air coefficients. It is also shown that plasma-assisted combustion with dilution air hole actuation is superior to that of secondary air hole actuation for the combustion of liquid-kerosene fuel. Besides, plasma-assisted combustion effect is more obvious with an increase of duty ratio or feedstock air--flow rate. These results are valuable for the future optimization of kerosene-fueled aero-engine when using plasma-assisted combustion devices to improve emission performance of annular combustor.unique capacity in producing reactive species and heat and modifying transport processes [2]. In the last two decades, great progress has been made in exploring the mechanisms of plasma chemistry interactions and energy distribution method in the discharge process.Non-equilibrium plasma is a type of plasma in which the electronic, vibrational, and rotational temperatures are very different and the electrons have significantly higher plasma temperature than the other gas components. Typical non-equilibrium plasma includes dielectric barrier discharge, gliding arc discharge, glow discharge, microwave discharge, streamer discharge, and corona discharge. Compared to equilibrium plasma, non-equilibrium plasma is more kinetically active, because it can rapidly produce active radicals and excite species through various plasma chemistry reactions, such as electron impact dissociation, excitation, and subsequent energy relaxation [1][2][3][4]. Productions of new species accelerate chain branching reactions and broaden the ignition kernel, while the elevated temperatures from the plasma reduce radical quenching caused by recombination and diffusion to the walls.Many impressive demonstrations of the advantages of plasma-assisted combustion (PAC) using non-equilibrium plasma discharge in emission control have been made. Dielectric barrier discharge, pulsed corona discharge, gliding arc discharge, and microwave discharge were used as plasma-assisted combustion actuation (PACA) method. These studies have shown that PAC has the prominent capacity to reduce NO x emission. Recently, by using PAC technology, SO x [5] and unburned hydrocarbons [5,6] in flue gas as well as soot formation in the exhausted gas of Diesel engines [7-9] have been successfully removed, which further demonstrate the strong capability of plas...

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