Abstract
Experimental results are reported for flows in a ramp-type, external compression inlet with a large-aspectratio, rectangular cross section. The inlet was operated at a freestream Mach number of 1.84 with mechanically generated downstream perturbations. High-speed schlieren and time-dependent pressure measurements were employed extensively. In supercritical operation, pressure fluctuations throughout the inlet caused by the excitation varied linearly with the fluctuations at the exit station, even for large exit station amplitudes. In subcritical operation (buzz), the excitation interacted nonlinearly with the naturally present, highly periodic oscillations by either modifying the natural frequency, if the excitation was near a natural harmonic, or by having the excitation modulate the naturally occurring oscillation. In addition, the conditions at the two criticality boundaries were determined as a function of excitation amplitude and frequency.
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