Stabilization of a premixed methane-air flame with a high repetition nanosecond laser-induced plasma

Yu, Yang; Li, Xiaohui; An, Xiaokang; Yu, Xin; Fan, Rongwei; Chen, Deying; Sun, Rui

doi:10.1016/j.optlastec.2017.01.001

Cited by 9 publications

(3 citation statements)

References 39 publications

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“…The surge in OH fluorescence intensity from misfire to fire in filament-induced ignition is strikingly different from that in ns-LISI, where the signal intensity linearly increases as the laser energy increases around the threshold 25 . The significant increase in OH radicals around the ignition threshold in the filament case shows a clear boundary between successful and failed ignition events.…”

Section: Discussionmentioning

confidence: 61%

“…It can also be seen from Fig. 4b that all the measured energy deposition efficiencies are <30%, which are much lower than those (40–60%) of ns-LISI 25 . Clearly, the minimum ignition energy can decrease to the sub-mJ level (<0.4 mJ), which is approximately one order of magnitude smaller than the reported values in ns-LISI 6 .…”

Section: Energy Deposition Measurementmentioning

confidence: 77%

“…When the delay time increases, the laser-induced flame appears clearly, which further evolves to a large size. In addition, as combustion develops, the upper and lower fronts of the flame behave differently, having cone-shaped and nearly flat structures, respectively, similar to those in ns-LISI 25 .

Fig.…”

Section: Dynamic Evolution Of the Flame Kernelmentioning

confidence: 93%

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Robust and ultralow-energy-threshold ignition of a lean mixture by an ultrashort-pulsed laser in the filamentation regime

Zang

Zhang

et al. 2021

Light Sci Appl

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Laser ignition (LI) allows for precise manipulation of ignition timing and location and is promising for green combustion of automobile and rocket engines and aero-turbines under lean-fuel conditions with improved emission efficiency; however, achieving completely effective and reliable ignition is still a challenge. Here, we report the realization of igniting a lean methane/air mixture with a 100% success rate by an ultrashort femtosecond laser, which has long been regarded as an unsuitable fuel ignition source. We demonstrate that the minimum ignition energy can decrease to the sub-mJ level depending on the laser filamentation formation, and reveal that the resultant early OH radical yield significantly increases as the laser energy reaches the ignition threshold, showing a clear boundary for misfire and fire cases. Potential mechanisms for robust ultrashort LI are the filamentation-induced heating effect followed by exothermal chemical reactions, in combination with the line ignition effect along the filament. Our results pave the way toward robust and efficient ignition of lean-fuel engines by ultrashort-pulsed lasers.

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Section: Discussionmentioning

confidence: 61%

Section: Energy Deposition Measurementmentioning

confidence: 77%