This article presents experimental and computational results on ignition of nonpremixed, counterflowing jets of nitrogen-diluted methane versus heated air within a wide range of pressures, fuel concentrations, and flow strain rates.
The motion of the film through the liquid can be sufficient for proper contact of the film with the solutions, but sometimes submerged sprays with small jets of fine nitrogen bubbles are provided to increase the agitation.
These plumes represent invisible jets of gaseous nitrogen, together with dust.
This was achieved with a technique called 'high pressure freezing' that combines jets of liquid nitrogen with very high pressures to instantaneously preserve small samples without causing damage through the formation of ice crystals, or any shrinkage and distortion.
The experimental methodology implements jet diffusion flames of nitrogen-diluted acetylene fuel burning in quiescent air at atmospheric pressure.
The methodology deploys round jet diffusion flames of nitrogen-diluted acetylene fuel burning in quiescent air at atmospheric pressure.
Figure 5 shows the overexpanded PLIF image of the nitrogen jet of Mach 2.5 for four different tank pressures.
