2020
DOI: 10.1088/1361-6463/abadc1
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A comparative study of laser-induced gas breakdown ignition and laser ablation ignition in a supersonic combustor

Abstract: Cavity ignition was achieved in a supersonic combustor by laser-induced gas breakdown (LIGB) and laser ablation (LA). High-speed photography and schlieren imaging were employed to characterize the ignition processes. schlieren imaging was also applied to visualize LIGB and LA in quiescent air. The input energy was approximately 200 mJ. The distance between the focal point of the convex lens and the target plate (d) varied from 10 mm above the target plate (d = 10 mm) to 5 mm below the target plate (d = −5 mm).… Show more

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Cited by 5 publications
(1 citation statement)
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“…The time interval between the dual-optical pulses during laser ablation plays an important role in determining the degree of physical phenomena in target materials, such as environmental gas density, temperature, and shockwave [30,31]. In the case of intervals shorter than 20 μs, the first pulse typically generates and expands laser-induced plasma after the optical breakdown over the target surface, thus resulting in shockwave propagation [30][31][32]. As the gas density at the laser-irradiated spot is reduced, no additional pulse energy is delivered; in turn, this did not lead to ablation in the target (plasma shielding) [30,31].…”
Section: Discussionmentioning
confidence: 99%
“…The time interval between the dual-optical pulses during laser ablation plays an important role in determining the degree of physical phenomena in target materials, such as environmental gas density, temperature, and shockwave [30,31]. In the case of intervals shorter than 20 μs, the first pulse typically generates and expands laser-induced plasma after the optical breakdown over the target surface, thus resulting in shockwave propagation [30][31][32]. As the gas density at the laser-irradiated spot is reduced, no additional pulse energy is delivered; in turn, this did not lead to ablation in the target (plasma shielding) [30,31].…”
Section: Discussionmentioning
confidence: 99%