Faculty Advisor

Demetriou, Michael A.

Faculty Advisor

Olinger, David J.

Abstract

Grazing 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.

Publisher

Worcester Polytechnic Institute

Date Accepted

January 2001

Major

Mechanical Engineering

Project Type

Major Qualifying Project

Accessibility

Restricted-WPI community only

Advisor Department

Mechanical Engineering

Advisor Program

Mechanical Engineering

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