Cavity Aeroacoustics
Abstract
Consider the retraction or hiding of items in a cavity that is closed and smooth to the flow over the body. At an appropriate time, doors or panels open as part of a desired operational sequence, and the storage volume, or cavity, together with the contents, are exposed to the external flow. Two important flow phenomena occur with exposure of a cavity in high speed aircraft: (1) development of a shear layer within which transition from the stagnant cavity environment to the active external flow occurs, and (2) the creation of a concomitant fluctuating pressure environment. A program of experiments has been undertaken since 1985 at Arnold AFB, TN to investigate these phenomena which have resulted in a rather large data base describing the aeroacoustic environment associated with cavities of three different length-to-height ratios, equipped with a variety of acoustic suppression devices and doors, and exposed to external flows of subsonic and supersonic speeds. This paper documents that series of experiments and the results therein. Keywords: Flow suppression devices; Shear layer; Aeroacoustic modulation; Store loads; Computational fluid dynamics; Schlieren evidence.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1990
- Accession Number
- ADA223853
Entities
People
- Carroll Butler
- Richard E. Dix
Organizations
- Arnold Engineering Development Complex