Inspection of Large Droplets in Fuel Sprays Using a Gaussian Laser-Sheet: An Experimental Approach

Figure 4

Image of JP8 fuel droplets, showing the process of a large droplet formation (laser pulse duration 5 ns) during the resting phase of the injection incident (1.2 ms). (1) A droplet attached to the heating matrix located at the saturation region (in the middle) of the laser sheet. (2) A developing droplet (ligament) at the side of the laser sheet; this part is affected by the secondary reflections from back droplets. (3) A completely developed droplet (around 2.51 mm in diameter) at the side laser sheet. (4) The main reflection on the surface where the laser rays strike the droplet. (5) Interreflection where the light rays leave the droplet after being deflected inside the droplet. (6) The direction of the incident laser beams. (7) The body of the injector and the heating matrix.