A SWIRL-TYPE FLOWMETER WHOSE OUTPUT FREQUENCY IS A FUNCTION OF FLUID-FLOW RATE, THE FREQUENCY BEING SUBSTANTIALLY LINEAR THROUGHOUT A BOARD REYNOLDS NUMBER RANGE. THE METER INCLUDES A FLOW TUBE WHOSE INLET SECTION HAS A SET OF FIXED SWIRL BLADE THEREIN WHICH IMPART A SWIRLING MOTION TO INCOMING FLUID, THE SWIRLING FLOW BEING CAUSED TO PRECESS IN AN ENLARGING SECTION OF THE TUBE. THE PRESESSIONAL MOTION IS DETECTED TO PRODUCE VOLAGE PULSES WHOSE FREQUENCY DEPENDS ON FLOW RATE. TO MAINTAIN THE DESIRED LINEAR RELATIONSHIP BETWEEN FLOW RATE AND FREQUENCY, THE GEOMETRY OF THE SWIRL BLADES AND THE INLET SECTION ASSOCIATED THEREWITH IS MADE SUCH AS TO ACCELARATE FLOW THERETHROUGH TO MINIMIZE BOUNDARY-LAYER SEPARATION ALONG THE SURFACE OF THE BLADES.