Abstract
Schlieren photography is one of the most popular visualization techniques. Although it has been used in variety of fields, all of the applications are quanitative analysis. The objective of this research is to develop a measurement technique for quantitative analysis using Schlieren photography for diagnostics of internal combustion engines. One important parameter in engine research, for example, is the air entrainment in the fuel jets. Its measurement has been possible only with by point scanning probes. With this photographic technique it will be possible to measure instantaneously the whole space of the density field. This paper describes the theoretical background, the execution problems, and the necessary correction techniques. The experiment was made for a two dimensional and circular CO2 jet injected into air. The results show that density profile and air entrainment can be quantitatively analyzed with a certain measure of accuracy. The results indicate this technique is applicable for approximate diagnostics of internal combustion engines.
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