Extension of a Vortex flow transducerconcept to high pressure applications

University essay from KTH/Maskinkonstruktion (Inst.)

Abstract: This master thesis project has been carried out in cooperation with the Endress+Hauser Flowtec AG in Switzerland. The project was part of a bigger predevelopment project for a vortex flow meter in the research and development department of Endress+Hauser. Prowirl (vortex) flow meters are often used for measuring the volume flow in steam applications. This measurement method is based on the phenomena of vortices occurring behind obstacles in a stream which are registered by a sensor. Aim of the project was to develop and test a new vortex flow transducer concept for highest pressure applications (line pressure of 250 bars). Endress+Hauser already had a sensor for such applications which was outdated and not compatible to the newer generation of sensors. Two concepts with and without a temperature sensor option have been generated. The concepts have been modeled and verified via FE-analysis and analytical calculations according to the relevant standards (ASME Boiler and Pressure Vessel Code and EN 13445). After the calculations prototypes have been manufactured and tested. The conducted tests matched the simulations well and proved that the concept worked. More detailed tests after this thesis project are necessary to transfer the concept into a final product. However, it has been shown that the new concept has significant advantages over the existing highest pressure sensor. These are a bigger pressure range, the option of integrating a temperature sensor and a cost reduction for the flow meters compared to the existing design. Keywords: Vortex, Flow meter, Sensor, Water hammer

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