Skip to main content

Flow modelling for metering purposes

Objective



Two flow rigs, one for water and one for air, were circulated in an intercomparison of laser doppler and hot wire anemometry measurements. Complex systematic differences in results were observed for not only the two types of measuring system but also between instruments of different design based on the same principle. Additionally, the inability to measure sufficiently close to the wall led to unacceptable differences between the integrated flow and that measured by an accompanying flow meter.

RESULTS

Using the measured inlet flow profiles and the geometries of the flow rigs, and intercomparison of flow computations was made using different computer codes for the same two down stream planes measured in the experimental programme. The results showed considerable dispersion particularly in the turbulence parameters. Even when two models used nominally identical computer codes there were significant differences in results beacuse of grid size effects, especially near the walls. Moreover, the integrated flow varied by up to 18%.

A comparison of the theoretical and experimental results suggested that on average the former differed from the latter by about 4%. It is therefore unlikely that current flow computations can be used to limit the need for experimentation.

Coordinator

CRANFIELD UNIVERSITY
Address
Road Wharley End
MK43 0AL Cranfield,bedford
United Kingdom

Participants (10)

AACHEN UNIVERSITY OF TECHNOLOGY
Germany
Address
Templergraben 55
52056 Aachen
Delft Hydraulic
Netherlands
IST Lisbon
Portugal
NATIONAL ENGINEERING LABORATORY (NEL)
United Kingdom
Address
East Kilbride
G75 0QU Glasgow
Office National d'Etudes et de Recherches Aerospatiales - ONERA
France
Address
29, Avenue De La Division Leclerc
2320 Chatillon
Technical University Eindhoven
Netherlands
UNIVERSITAET BREMEN
Germany
Address
Bibliothekstrasse 1
28334 Bremen
University College Dublin
Ireland
University of Thessaloniki
Greece
Università degli Studi di Ancona
Italy
Address

Ancona