Seventh International Symposium on Turbulence and Shear Flow Phenomena
DOI: 10.1615/TSFP7
JET NOISE REDUCTION BY FLUIDIC INJECTION FROM A ROTATING PLUG
pages 1-6
DOI: 10.1615/TSFP7.2340
要約
We explore a novel jet noise reduction device involving the steady injection of fluid from two diametrically-opposed ports on a rotating centerbody. For the rotation speeds currently possible, noise reductions are observed over a low-frequency range, up to the rotation frequency. Preliminary results suggest that the noise reduction mechanism may be due to the most unstable flow modes (axisymmetric mode m = 0) being deprived of fluctuation energy due to an excitation of less unstable modes (azimuthal mode m = 2 driven at St = 0.23).