Cavitating Herschel Venturi nozzle test rig

H. Warnecke, C. Kroner, D. Schumann, J. Tränckner

Abstract

Cavitation is a phenomenon, which is typically associated with negative effects, for example damage at propellers in water. However, there are various applications in which cavitation is exploited advantageously such as injection nozzles in diesel engines or cleaning with an ultrasonic bath. A new application is the deployment of cavitating nozzles in liquid flow measurements. The novelty of the application means from a metrological point of view the requirement to analyse potential influencing factors on the measurement quality in-depth. These comprise among others the installation conditions of the nozzles in a test rig or the additivity of flows when more than one nozzle is used. Furthermore, comprehensive insights into cavitation processes for different liquids are desirable with the view on a broad range of cavitation nozzle applications in liquid flow measurements.<BR />First investigations are carried out for different fluids including liquid mixtures such as white spirits. A detailed analysis of the pressure measurement in front and at the back of the nozzles gives further information about how fast the flow rate changes and about the cavitation process itself. This is of relevance for a possible application, in which flow rate profiles are used to assess flow meter performance under dynamic loads. Such load profiles e.g. serve as input for a test rig with cavitation nozzles to assess the performance of domestic water meters.

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IMEKO TC

TC9 - Flow Measurement

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