Using a Passive Feedback Connection to Control Low-Frequency Pressure Fluctuations in a Wind Tunnel
Keywords:Wind tunnel pressure fluctuations, Passive Feedback Connection, Model Wind Tunnel
A Passive Feedback Connection (PFC) was evaluated for use in an aero-acoustic wind tunnel. The PFC can reduce the high-amplitude low-frequency pressure fluctuations in the wind tunnel circuit. In addition, the PFC can also reduce non-periodic fluctuations in wind speeds, i.e., not just fluctuations associated with resonances arising from the coupling of open jet pressure instabilities with circuit modes. The PFC achieved these results without significantly altering the axial static pressure gradient in the wind tunnel.
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