AN OPTICAL ANALYSIS OF AN INDUCED FLOW EJECTOR USING LIGHT POLARIZATION PROPERTIES

This paper presents an optical analysis of an induced flow ejector by means of plane laser sheets. The visualization method, which is develo ped here, takes advantage of the polarization properties of the light scattered by the fine droplets produced by condensation within the flo w. This optical analysis shows that the droplets scatter near the Rayl eigh scattering regime, thereby proving that their mean radius does no t exceed 0.05 mum. Furthermore, the injection of depolarizing tracers into the induced stream makes it is possible to distinguish visually b etween the supersonic primary jet and the subsonic induced stream, and to obtain information about the mixing of the two streams.