Abstract
To ignite fuel spray with a laser beam directly, it is necessary to investigate the characteristics of laser-induced breakdown in fuel spray. In this present study, the effects of incident energy and spray characteristics on the breakdown and ignition characteristics were investigated experimentally. Laser-induced breakdown ignition experiments was conducted in ethanol spray by using the third harmonic of the Q-switched Nd:YAG laser (wavelength λ=355 nm, pulse width is about 6 ns and maximum output energy is about 375 mJ/pulse) as a laser source. Probability of breakdown occurrence and ignition for different incident energy and droplet number density were obtained. And to clarify the ignition mechanism, the Schlieren images of the plasma and flame propagation process were taken. It found that there is a large gap between the required incident energy for breakdown and ignition in ethanol spray. And plasma is generated by the multiple points in ethanol spray. In case of ignition success, flame kernels ware formed around each plasma.
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