Problem

• Incompressible case characterized by single peak in unsteady pressure power spectrum

M¥ = 0.13, L/D = 0.5

• Compressible case characterized by multiple peaks, low frequency peak, and sum/difference frequencies

M¥ = 0.4, L/D = 2

SPL = 157 dB

• Lead to large amplitude oscillations ® structural failure

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