The structure and development of streamwise vortex arrays embedded in a turbulent boundary layerThe results of an experimental investigation of the structure and development of streamwise vortices embedded in a turbulent boundary layer are presented. Measurements of secondary velocity in the crossplane are used to characterize the vortex array structure. Measurements in the crossplane at two streamwise locations characterize the influence of interactions among the vortices on the array structure when the initial spacing between vortices is varied. Evidence of the merging of counter-rotating cores is found in embedded arrays of closely spaced vortices. A model of vortex interaction and development is constructed from the experimental results. This model is based on the structure of the two dimensional Ossen vortex. The decay of vortex circulation due to the merging of the cores is correlated with the crossplane gradient in streamwise vorticity occurring between an embedded vortex and its adjacent counter-rotating neighbors.
Document ID
19920045580
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Wendt, Bruce J. (NASA Lewis Research Center Cleveland, OH, United States)
Greber, Isaac (Case Western Reserve University Cleveland, OH, United States)
Hingst, Warren R. (NASA Lewis Research Center Cleveland, OH, United States)