Triple Velocity Correlations and Other Turbulence Quantities from 3-D LDV Measurements of the Flow in an Orifice Meter,
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 23, 1992
- Accession Number
- ADP008940
Entities
People
- David L. Panak
- Gerald L. Morrison
- Gregory H. Nail
- Robert E. Deotte Jr.
Organizations
- Texas A&M University