Abstract
Tomographic Background Oriented Schlieren (BOS) is a fast and non-intrusive measurement technique to reconstruct three-dimensional density fields. An overview is given of the application of tomographic BOS to turbomachinery. Measurements taken from a double free jet of air, the flow behind turbine blades in a linear cascade wind tunnel, and the exhaust jet of a helicopter engine are summarized. The scope of BOS is extended in the present paper by performing non-tomographic BOS measurements on different turbofan engine exhaust jets using one camera. The three-dimensional BOS measurements are analyzed by means of a tomographic algorithm, based on the filtered back-projection. The results of the two-dimensional BOS measurements of turbofan engines show a potential for identifying differences in the condition of the engines by measuring their exhaust jet. Based on the results of the tomographic measurements and the results of the turbofan engine measurements, tomographic BOS measurements are shown to be a promising method for detecting and locating defects in jet engines by measuring their exhaust jet.
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