Simulation of DC gliding arcs for supersonic combustion: influence on O2/H2 ignition
Résumé
The scramjet engine has been developed to reach high Mach number flight. However, supersonic combustion is difficult to initiate and strengthen in a reasonable engine size. In addition to the cavity, strut or step flame holders, PAC (Plasma Assisted Combustion) is another possibility to stabilize the combustion. This article is dedicated to a particular plasma technology: the Q-DC (Quasi-Direct Current) gilding arc. It enables a temperature deposit of about 10 000 K in the fuel mixing zone. The study is based on an adaptation of S. B. Leonov's PIM (Plasma Injector Module) in a Mach 2 flow. To model PAC, the Navier-Stokes equations with Joule heating and the electric-field are solved by two coupled codes. The restrike phenomenon is taken into account, thanks to a plasma discharge macromodel. The combustion of H2/O2 is modeled by a skeletal kinetic scheme of 9 species. This paper demonstrates the capacity of the electric arc to ignite and maintain combustion in unfavourable conditions.
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