Flowmeter

Abstract

A fluidic oscillator for a shunt flowmeter for measuring gas flow through a pipeline, comprises three sections arranged in series and providing a generally U-shaped flow path through the oscillator. The first section has an inlet end connectable to an outlet port in the pipeline and leading to a main fluid nozzle communicating with an interaction chamber, diverging sidewalls of the flow path extending downstream of the interaction chamber, and feedback loops extending from the diverging sidewalls to control nozzles at the interaction chamber. The second section is juxtaposed to the first section to return the flow to the pipeline and has an outlet end connectable to a return port in the pipeline. The second section includes diverging sidewalls terminating in a flow restriction adjacent the outlet end, and a flow-splitter body physically dividing the flow. Sensor ports are provided on opposite sides of the flow-splitting body for the connection of a flow sensor to detect oscillations in the gas flow through the second section. A third section interconnects the outlet end of the first section with the inlet end of the second section and includes a flow-splitting partition aligned with the flow-splitting body. A flow-splitting member is provided at and adjacent the outlet end of the first section for dividing the flow from the interaction chamber prior to entry into the third section.