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- Title
USING A PASSIVE FEEDBACK CONNECTION TO CONTROL LOW-FREQUENCY PRESSURE FLUCTUATIONS IN A WIND TUNNEL.
- Authors
Waudby-Smith, Peter; Joshi, Antrix; Sooriyakumaran, Christopher; Gabriel, Christoph; Grabenstein, Martin
- Abstract
Open jet wind tunnels often suffer from low-frequency, high-amplitude pressure fluctuations which are related to resonant modes within the circuit. Typically, these fluctuations are controlled using nozzle vortex generators, Helmholtz resonators, collector design, active noise cancellation, and various other methods. The goal of this paper is to evaluate a Passive Feedback Connection (PFC) 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. pressure fluctuations not associated with resonant modes. The PFC achieved these results without significantly altering the axial static pressure gradient in the wind tunnel.
- Subjects
WIND tunnels; WIND pressure; PRESSURE control; STATIC pressure; VORTEX generators; HELMHOLTZ resonators
- Publication
Canadian Acoustics, 2022, Vol 50, Issue 1, p11
- ISSN
0711-6659
- Publication type
Article