Perspective of laser-induced plasma ignition of hydrocarbon fuel in Scramjet engine

Leichao Yang; Xiaohui Li; Jianhan Liang; Xin Yu; Xipeng Li

doi:10.1117/12.2230904

26 January 2016 Perspective of laser-induced plasma ignition of hydrocarbon fuel in Scramjet engine

Leichao Yang, Xiaohui Li, Jianhan Liang, Xin Yu, Xipeng Li

Proceedings Volume 9796, Selected Papers of the Photoelectronic Technology Committee Conferences held November 2015; 97962I (2016) https://doi.org/10.1117/12.2230904
Event: Selected Proceedings of the Chinese Society for Optical Engineering Conferences held November 2015, 2015, Various, China

Abstract

Laser-induced plasma ignition of an ethylene fuelled cavity was successfully conducted in a model scramjet engine combustor. The ethylene was injected 10mm upstream of cavity flameholder from 3 orifices 60 degree inclined relative to freestream direction. The 1064nm laser beam, from a Q-switched Nd:YAG laser source running at 3Hz and 200mJ per pulse, was focused into cavity for ignition. High speed photography was used to capture the transient ignition process. The laser-induced gas breakdown, flame kernel generation and propagation were all recorded and ensuing stable supersonic combustion was established in cavity. The flame kernel is found rotating anti-clockwise and gradually moves upwards as the entrainment of circulation flow in cavity. The flame is then stretched from leading edge to trailing edge to fully fill the entire cavity. Eventually, a stable combustion is achieved roughly 900μs after the laser pulse. The results show promising potentials for practical application. The perspective of laser-induced plasma ignition of hydrocarbon fuel in scramjet engine is outlined.

Citation Download Citation

Leichao Yang, Xiaohui Li, Jianhan Liang, Xin Yu, and Xipeng Li "Perspective of laser-induced plasma ignition of hydrocarbon fuel in Scramjet engine", Proc. SPIE 9796, Selected Papers of the Photoelectronic Technology Committee Conferences held November 2015, 97962I (26 January 2016); https://doi.org/10.1117/12.2230904

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