Active control of pressure oscillations in deep cavities excited by a grazing flow
PubblicoGrazing flow over a deep cavity can result in resonance characterized by a standing wave/vortex feedback loop. Control of cavity resonance has potential impact in stealth aircraft and aircraft wheel well/weapons bay applications, where periodic stress loading can cause material fatigue failure or destruction of instrumentation. A perturbation analysis of the fundamental equations of motion for a fluid system motivates control methods based on interactions of external sources of mass, momentum, and energy with cavity fluctuations. Through proper placement of a screen (drag force) supported by springs in wind tunnel laboratory experiments, the rms pressure level in the cavity was significantly reduced without interacting with the approaching boundary/shear layer. Further reductions were observed when a piezoelectric actuator, a ceramic capable of vibration when alternating current is passed through it, is used to actively vibrate the screen.
- This report represents the work of one or more WPI undergraduate students submitted to the faculty as evidence of completion of a degree requirement. WPI routinely publishes these reports on its website without editorial or peer review.
- Creator
- Publisher
- Identifier
- 01D267M
- Advisor
- Year
- 2001
- Date created
- 2001-01-01
- Resource type
- Major
- Rights statement
- Ultima modifica
- 2022-11-30
Relazioni
- In Collection:
Articoli
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