Search for Chaos in Free Shear Flows
Abstract
Theoretical studies on the temporal and spatial structure in blunt- body wakes have revealed the necessary conditions under which global, self- sustained oscillations appear and have provided firm criteria for specifying the frequency of these oscillations. The theory has also been employed to describe the preferred mode in jets. The two-dimensional structure of these modes provides a firm basis for describing the spatial structure of the vortex pattern observed in wakes. In addition, a theoretical description of the appearance of the spatial chaos in wake-shear layers, and its representation in terms of a one-dimensional map, has been provided. An experimental facility and necessary instrumentation have been assembled and experiments are in progress on spatial chaos in wake-shear layers. Experimental results have revealed a parameter domain where a temporal vacillation occurs between the Karman mode and the shear layer mode. Interesting results with possible application to thrust-vectoring of base flows have also been identified
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1992
- Accession Number
- ADA266245
Entities
People
- Chih-ming Ho
- Larry G. Redekopp
- Patrick Huerre
Organizations
- University of Southern California