This paper compares the effectiveness of zero- low- and high-frequency flow control methodologies when applied to a generic weapons bay cavity. Using the High Frequency Excitation Active Flow Control for Supersonic Weapons Release (HIFEX) generic weapons bay model the actuators were tested at Mach 0.85 and 1.19. The zero-frequency actuator tested was a conventional one-delta “sawtooth” spoiler, while the low-frequency device was a pulse-blowing actuator. The sawtooth spoiler performed as expected by reducing the Overall Spectrum Level (OASL) slightly in both the subsonic and supersonic cases. The pulsed-blowing actuator reduced the OASL as much as 9.6dB for both the subsonic and supersonic cases. The high-frequency devices tested were the Powered Resonance Tube (PRT) and a Splash Jet actuator. The PRT and Splash Jet reduced the (OASL) equally well at Mach 0.85 for all the mass flow rates tested. The PRT outperformed all other actuators at Mach 1.19 except for the highest mass flow rate of 0.227 kg/s, where the Splash Jet performed equally as well the PRT.
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