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Title: Measurement Of Two Phase Hydrocarbon Spray Flows Using Laser Plasma Spectroscopy
Author: S.H. Lee J.J. Yoh
Source: Flomeko 2016
Year Published: 2016
Abstract: Performance and emission characteristics of direct injection (DI) engines are greatly influenced by many factors such as the local fuel/air equivalence ratio and condensed - fuel concentration. Picturing the inhomogeneous distributions of the flow properties is essential in understanding the ignition processes in two phase hydrocarbon spray flows. Simultaneous laser ignition and spectroscopy is a scheme that enables rapid determina tion of the local equivalence ratio and condensed fuel concentration during a reaction in two phase spray flows. In parallel with laser ignition, the equivalence ratio and droplet characteristics such as the concentration, size, and distribution of hydroca rbon spray flows are simultaneously obtained for a feedback control system. The plasma characteristics of fuel droplets are evaluated initially by shadowgraph, and the high - speed imaging of air and spray breakdown provides visualization of the transition f rom the plasma to a flame kernel. The flow fields of the spray are obtained using the time - resolved PIV (Particle Image Velocimetry) method during the laser ignition.

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