FIELD: measurement technology, measurement of volumetric flow rate of liquid in operational hydraulic installations. SUBSTANCE: method is concerned with operation of turbines, pumps-turbines or pumps with spiral chambers housing stator columns. Average speed of flow by which flow rate is established is measured with the use of acoustic beam formed between two acoustic converters. One converter is located on wall of spiral chamber, the other converter is positioned on one of stator columns. Acoustic beam is formed at angle with tangent to circle circumscribed over inlet edges of stator columns in range from 0 to angle of setting of stator columns +(15-20 deg ). EFFECT: enhanced reliability and measurement accuracy. 2 cl, 12 dwg
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