With this method the liquid in the spray needs to be completely transparent for the laser light to avoid absorption and additional attenuation of the light. Overview of experimental setup. The wavelength of the laser light was 532 nm in comparison with 308 nm light used in the earlier work. Examples of images recorded for different pressures in the cell at a temperature of 295 K are shown in Figure 10. We notice how the spray plume breaks up from an elongated shape to a compressed part with evaporation of big volume with small droplets.
Work is now in progress to apply the earlier developed post-processing technique.
The laser measurements will in the near future continue with systemic experiments in the high pressure cell for systematic studies of different sprays, injectors, temperatures and pressures in the cell to determine the optimum conditions for spray formation. Figure 11, shows measurements on a running direct injected two-stroke engine.