Accession Number : ADP008940

Title :   Triple Velocity Correlations and Other Turbulence Quantities from 3-D LDV Measurements of the Flow in an Orifice Meter,

Corporate Author : TEXAS A AND M UNIV COLLEGE STATION DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Panak, David L. ; Morrison, Gerald L. ; DeOtte, Robert E., Jr. ; Nail, Gregory H.

Report Date : 23 JUL 1992

Pagination or Media Count : 6

Abstract : The flow of air passing through an orifice meter with a beat ratio (beta) of 0.75 and a Reynolds number of 54.700 has been examined using a 3-D laser Doppler velocimeter. The quantities derived from the 4096 simultaneous measurements of three velocity components at each of 670 locations in the flow field include the mean velocity vector, rms fluctuating components, the Reynolds stress tensor, and the entire triple correlation third order tensor. The mean velocity vector field shows the characteristics of flow associated with an orifice meter: fully developed axisymmetric flow undergoe, a large inward radial velocity gradient upstream of the plate. separates from the lip of the plate to form the vena contracts then spreads to the reattachment point at 2.5 pipe radii (10 step heights) downstream. The contour plots of the Reynolds stresses show the anisotropic nature of the flow field in the orifice plate region, and the triple velocity correlations indicate how rapidly the normal and shear stresses return to isotropic conditions. (Author)

Descriptors :   *LASER VELOCIMETERS, DOPPLER EFFECT, THREE DIMENSIONAL FLOW, REYNOLDS NUMBER, SHEAR STRESSES, AXISYMMETRIC FLOW.

Subject Categories : Test Facilities, Equipment and Methods
      Fluid Mechanics
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE