Research Article

Numerical Investigation of an Unsteady Blade Surface Blowing Method to Reduce Rotor Blade-Vortex Interaction Noise

Table 3

Comparisons of the thrust coefficient and SPL for the baseline case and the steady/unsteady blowing cases.

CaseThrust coefficientSPL (dB)
Mic 1236789

Baseline0.00539101.622107.506110.326107.701106.535104.680110.373
Steady blowing0.00505101.559107.409108.534107.754106.790104.561106.733
Unsteady blowing0.00521101.523107.355108.378107.787106.596104.455106.964

Notes: The decrease in SPLs at the microphones compared with the baseline case is shown in bold.