Accession Number : ADA195997

Title :   Volumetric Measurement of Vorticity Vectors by Optical Probe.

Descriptive Note : Final rept. Sep 87-Mar 88,

Corporate Author : PHYSICAL SCIENCES INC ANDOVER MA

Personal Author(s) : Ferguson, R D ; Frish, Michael B

PDF Url : ADA195997

Report Date : 27 May 1988

Pagination or Media Count : 79

Abstract : The general goal of the program was to demonstrate that the fluid flow measurement technique known as the Vorticity Optical Probe (VOP) could be used to measure the vorticity vectors within a volume of a flow field at many distinguishable locations simultaneously. The spatial resolution of the measurements would be small enough for them to be sensitive to the fine-scale fluctuations of the flow, yet the overall sampling volume large enough to enable study of the interactions between fine-scale features and large-scale structures. The specific objectives of the program were to demonstrate that: 1) The VOP provides sufficient information to allow rapid measurement of all three components of the vorticity vector at a single well-defined point within the flow field; 2) The vorticity vectors at several spatially distinct but unknown positions can be measured concurrently; and 3) A method could be developed for determining where in the sampling volume the vorticity is being measured. These three specific goals have been met using simulations of both the VOP and rotational flow. A data analysis technique has been developed which demonstrates the three-component measurement capability and indicates the inherent limits on its precision. (JHD)

Descriptors :   *VORTICES, *OPTICAL DETECTION, DATA PROCESSING, FLOW, FLOW FIELDS, FLUID FLOW, INTERACTIONS, MEASUREMENT, METHODOLOGY, OPTICAL EQUIPMENT, PROBES, RESOLUTION, ROTATION, SAMPLING, SPATIAL DISTRIBUTION, STRUCTURES, VOLUME, VOLUMETRIC ANALYSIS

Subject Categories : Test Facilities, Equipment and Methods
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE