Ignition of a gaseous methane/oxygen coaxial jet

Abstract

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 favour 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, Dinner diameter, outer diameter fps frames per second GO 2 gaseous oxygen GCH 4 gaseous methane J momentum §ux ratio,velocity ratio, V ratio = u CH4 /u O2 ρ density equivalence ratio

CARS temperature measurement in a LOX/CH4 spray flame

“…The micro-combustor M3 is a test facility designed for the basic phenomenological analysis of cryogenic injection and combustion. [15,16] The propellant combinations used up to now were mainly hydrogen and oxygen. The propellant supply system has been extended, and several hydrocarbons, among them methane, propane, and propene, can be used for the injection of cryogenic LOX/HC spray combustion.…”

Oxygen–Methane Torch Ignition System for Aerospace Applications

“…The work of Ellis [11] describes a background of a LOX/CH 4 swirled torch ignition system for a rocket engine and shows the flammability maps for various combinations of propellants. Pauly et al [12] show conditions of the flame attachment to the injector when applied to coaxial jets, flame stabilization in time and its liftoff distance during the flame stabilization.…”

Cars measurements at high pressure in a CH4/O2Jet flame

“…The present authors concentrated their e¨orts on simultaneous and synchronous CARS of H 2 and H 2 O because this gives valuable information on the mixing processes in the turbulent reacting §ow. H 2 and H 2 O were already widely used as probed molecules in the past for CARS temperature measurements in sub-and supercritical LOx/GH 2 cryogenic combustors because of their abundance [3,5,6]. In the current experiment, the same molecules were probed using a laser system composed of two separate optical benches producing the pump and Stokes beams required for H 2 and H 2 O Figure 5 The CARS experimental setup.…”

“…Among hydrocarbons, methane is one of the best suitable candidates because of its high speci¦c impulse. Moreover, it represents the simplest hydrocarbon fuel for investigating various physical processes related to rocket combustor technology such as regenerative cooling [3], kinetics of LOx/CH 4 [4], propellant injection [5], and ignition [6].…”