INSTRUMENT FOR MEASURING PULSATION CHARACTERISTICS IN TURBULENT FLOWS

The paper considers the design of a two-component strain gauge construction for measuring pulsation characteristics in turbulent flows.
 analysis is carried out and shortcomings existing sensor models their influence on reliability accuracy experimental results are shown. limited frequency range such sensors also emphasized.
 previous types based plate which wire or film gauges glued. In models, main part perceiving hydrodynamic pressure goes to formation stresses elastic plate, only small (up 4%) - create strain-sensitive elements. Such require an increase size sensitive elements, this causes additional disturbance flow, turn reduces measurement.
 use glue associated with adverse effects as creep aging glue.
 proposed used form constantan wires stretched parallel each other, helped get rid plates glue, reduced sensing element.
 A shown its described.
 has free vibration water more than 300 Hz, order magnitude higher flow oscillations. This allows accurate measurement characteristics.
 principle operation considered.
 presence four correspondingly located tensile strands made it possible measure longitudinal transverse components velocities flows.