Internal and external jet modes of an over-expanded tic nozzle

Abstract eng:
Experiments at different pressure ratios are conducted on a Truncated Ideal Contour nozzle operating under over-expanded conditions. A system permitting synchronised data acquisition of internal pressure signals and external velocity fields is implemented. Preliminary results display a strong flapping motion of the external jet. This motion is seen to be maximised for a specific nozzle pressure ratio. On the other hand, internal pressure signals reveal the existence of highly organised pressure fluctuations of great amplitude in the separation region which are linked to specific azimuthal modes. Furthermore, the first azimuthal mode has been associated with the generation of side-loads. The characteristic dynamics of the external jet are linked to the dominant modes observed inside the nozzle to try to unravel its connection with the generation of side-loads.

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