In this section, you can access to the latest technical information related to the FUTURE project topic.

Experimental investigation on the impacts of ignition energy and position on ignition processes in supersonic flows by laser induced plasma

Cavity ignition of a model scramjet combustor fueled by ethylene was achieved through laser induced plasma, with inflow conditions of Ma = 2.92, total temperature T 0  = 1650 K and stagnation pressure P 0  = 2.6 MPa. The overall equivalent ratio was kept at 0.152 for all the tests. The ignition processes at different ignition energies and various ignition positions were captured by CH? and OH? chemiluminescence imaging. The results reveal that the initial flame kernel is carried to the cavity leading edge by the recirculation flow, and resides there for ?100 ?s before spreading downstream. The ignition time can be reduced, and the possibility of successful ignition for single laser pulse can be promoted by enhancing ignition energy. The scale and strength of the initial flame kernel is influenced by both the ignition energy and position. In present study, the middle part of the cavity is the best position for ignition, as it keeps a good balance between the strength of initial flame kernel and the impacts of strain rate in recirculation flow.

» Author: Bin An, Zhenguo Wang, Leichao Yang, Xipeng Li, Jiajian Zhu

» Reference: Acta Astronautica, Volume 137

» Publication Date: 01/08/2017

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