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Publications
2022
Lift-off heights of three well-studied reference jet fuels and three surrogate jet fuels with similar pre-vaporized combustion behavior are measured in a piloted spray burner using chemiluminescence imaging. The spray burner consists of a central tube of two-phase flow, resembling an open-pipe atomizer, and a surrounding hydrogen/air pilot flame to assist ignition of the liquid fuel. It is found that the lift-off behaviors of the reference jet fuels are generally comparable, with the main differences occurring for the most transient condition. However, the surrogate fuels do not reproduce the lift-off heights of the reference fuels due to discrepancies in the spray behaviors between the two. In particular, the differences in viscosity are inferred to be the primary reason for the variations in the flame heights. This investigation confirms that the physical properties of …
2021
Misty plasmas are typically defined as plasma containing small liquid droplets and therefore makes it a multiphase system. In an attempt to characterize an atmospheric pressure misty plasma discharge a flat plate dielectric barrier discharge (DBD) is designed that utilizes a stagnation flow field for the introduction of water droplet laden flow. The water droplets in the form of spray are introduced through an annulus from the bottom plate, which also acts as the grounded electrode. The interaction of the liquid spray and the DBD plasma discharge is characterized through measurements of the voltage-current characteristics, optical emission spectrum and discharge visualization. An AC driven power supply having a 22 KHz frequency was utilized to drive the DBD discharge and maintain a peak voltage and current of~ 8 kV and~ 100 mA respectively. Preliminary results show that the DBD discharge operates in the …
A dielectric barrier discharge system, employed to reform/remove organosilicon contaminants off a carrier stream to provide a sustainable, end-of-technology way of siloxane removal that will ensure siloxane does not re-enter the carrier stream, as well as generates useful end-products.
Misty plasmas are typically defined as plasma containing small liquid droplets and therefore makes it a multiphase system. In an attempt to characterize an atmospheric pressure misty plasma discharge, a flat plate dielectric barrier discharge (DBD) is designed that utilizes a stagnation flow field for the introduction of water droplet laden flow. The water droplets in the form of spray are introduced through an annulus from the bottom plate, which also acts as the grounded electrode. The interaction of the liquid spray and the DBD plasma discharge is characterized, and compared with glow discharge, through measurements of the voltagecurrent characteristics, optical emission spectrum and discharge visualization. The emissions Of radicals from H