Flow control using synthetic jet injection has been applied in a
low speed axial compressor. The synthetic jets were applied from
the suction surface of a stator vane via a span-wise row of slots
pitched in the streamwise direction. Actuation was provided
externally from acoustic drivers coupled to the vane tip via
flexible tubing. The acoustic resonance characteristics of the
system, and the resultant jet velocities were obtained. The effects
on the separated flow field for various jet velocities and
frequencies were explored. Total pressure loss reductions across
the vane passage were measured. The effect of synthetic jet
injection was shown to be comparable to that of pulsatory injection
with mass addition for stator vanes which had separated flow. While
only a weak dependence of the beneficial effect was noted based on
the excitation frequency, a strong dependence on the amplitude was
observed at all frequencies.
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