Basic Study of Flow Metering of Fluids in Piping Containing an Orifice Plate. Annual Report May 1987-April 1988

摘要

The experimental and numerical investigation of the flow through an orifice plate of beta ratio 0.7 is presented. The experimental approach consists in mean velocity measurements by LDA and by flow visualization linked with an image processing technique. The numerical approach is made using the Random Vortex Method. From these studies, steady and unsteady flow characteristics have been determined. Important parameters studied include the location of the reattachment point and its fluctuation, the location of the 'Vena contracta' and the frequencies of the shear layer movement. Influence of the Reynolds number on the parameters has also been investigated. These tests, performed with an orifice plate of large beta ratio with fully developed upstream flow conditions, will be extended to lower beta ratios and perturbed upstream flow conditions.