Accession Number : ADA259715


Title :   Unsteady Flow Distortion Past Blades: Sources of Noise Generation in Rotating Flows


Descriptive Note : Technical rept.


Corporate Author : LEHIGH UNIV BETHLEHEM PA DEPT OF MECHANICAL ENGINEERING AND MECHANICS


Personal Author(s) : Rockwell, D O ; Akin, O ; Kim, J H ; Konak, S ; Kuryla, J ; Magness, C ; Robinson, O ; Takmaz, L ; Towfighi, J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a259715.pdf


Report Date : Dec 1991


Pagination or Media Count : 56


Abstract : General objectives include determination of flow structure at leading- and trailing-edges of blading in terms of velocity gradients representing pressure sources and employment of active and passive control techniques to manipulate crucial phase shifts of vorticity fields past blading. Design and implementation of experimental systems include generic, controlled systems for study of basic classes of leading- and trailing-edge interactions and a unique radial flow machine for simultaneous active control and flow visualization. Techniques for quantitative bubble and particle tracking via laser diagnostics were developed. Methods of evaluation of images via laser interrogation and approaches to two- and three-dimensional image construction are presented.


Descriptors :   *BLADES , *LASERS , *WAKE , *UNSTEADY FLOW , VELOCITY , IMAGE PROCESSING , DISTORTION , TRAILING EDGES , DIFFUSERS , IMPELLERS , NOISE GENERATORS , RADIAL FLOW , BOUNDARY LAYER FLOW , LEADING EDGES , BUBBLES , DENSITY , VIBRATION , DISPLACEMENT


Subject Categories : Lasers and Masers
      Machinery and Tools
      Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE