Fluid Dynamics of Unsteady Cavity Flow

Unsteady, hypersonic flow over the nose of a blunt body with a forward-facing cavity is studied. A parameter study is conducted using a commercial finite-volume computer code to study the mechanisms of resonance. Numerical simulation results are often directly compared to recent experiments. Resonan...

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Bibliographic Details
Main Authors: Engblom, W. A, Goldstein, D
Format: Report
Language:English
Subjects:
ACOUSTIC RESONANCE
Aerodynamics
AEROTHERMODYNAMICS
CAVITATION
COMPUTATIONAL FLUID DYNAMICS
COMPUTERIZED SIMULATION
FINITE VOLUME METHOD
FLOW NOISE
Fluid Mechanics
FREE STREAM
HYDRODYNAMIC CODES
HYPERSONIC CHARACTERISTICS
HYPERSONIC FLOW
HYPERVELOCITY PROJECTILES
MACH NUMBER
PRESSURE DISTRIBUTION
UNSTEADY FLOW
VARIABLE PRESSURE
VISCOUS FLOW
WHITE NOISE
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Summary:Unsteady, hypersonic flow over the nose of a blunt body with a forward-facing cavity is studied. A parameter study is conducted using a commercial finite-volume computer code to study the mechanisms of resonance. Numerical simulation results are often directly compared to recent experiments. Resonant pressure oscillations within the cavity occur for relatively shallow cavities provided freestream noise is present. However, deeper cavities self-sustain strong resonance. A spring-mass-damper model is described which emulates noise-driven, relatively shallow cavity acoustic behavior. Original contains color plates; All DTIC/NTIS reproductions will be in black and white.