Ignition and §ame anchoring of a coaxial gaseous methane oxygen jet have been studied using high-speed visualization techniques. Several ignition scenarios (¤blowout,¥ ¤smooth,¥ and ¤strong ignition¥) have been found with speci¦c phenomenology depending, mainly, on the time delay between propellant valve opening and ignition. The time necessary for §ame anchoring is shown to depend on the mass §ow rate. Attached and detached §ames are observed and it is found that high momentum §ux ratios

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... the establishment of a §ame attached to the injector. For detached §ames, higher chamber pressures result in smaller liftod istances. NOMENCLATURE CC combustion chamber d, D inner diameter, outer diameter fps frames per second GO 2 gaseous oxygen GCH 4 gaseous methane J momentum §ux ratio, J = (ρu 2 ) CH 4 /(ρu 2 ) O2 ' m mass §ow rate p, P pressure R of mixture ratio, injection velocity V ratio velocity ratio, V ratio = u CH4 /u O2 ρ density equivalence ratio