Counterflow burner system

Photograph of a counterflow burner system and the nonreacting flow visualization using a laser sheet. 

Figure 4.1.2 is a photograph of a coimterflow burner assembly. The experimental particle paths in this cold, nonreacting, counterflow stagnation flow can be visualized by the illumination of a laser sheet. The flow is seeded by submicron droplets of a silicone fluid (poly-dimethylsiloxane) with a viscosity of 50 centistokes and density of 970 kg/m, produced by a nebulizer. The well-defined stagnation-point flow is quite evident. A direct photograph of the coimterflow, premixed, twin flames established in this burner system is shown in Figure 4.1.3. It can be observed that despite the edge effects.

Figure 11—14. Counterflow burner with integrated plasma system Magnetie gliding are discharge stimulation of eounterflow flame.

In the experiment parameters such as the equivalence ratio (velocity ratio, r = —U2/U1, between the mixture flow (Ui) and counterflow U2) are varied. For most of the experiments, the extension length (L) of the collar above the burner exit and the gap width (W) between the nozzle exit and the collar were kept constant as LjD = 1.0 and W/D = 0.23, respectively. However, these parameters can be easily varied, and their influence on the total performance of the system is also evaluated. Experimental results show that the nozzle exit velocity varies from 3.9 to 30 m/s corresponding to the Reynolds number of 2.610 to 210, based on the nozzle diameter and the exit velocity. 

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