DETERMINATION OF SOUND AND FLOW VELOCITY PROFILE IN GASES AND FLUIDS

摘要

FIELD: instrument making.;SUBSTANCE: four acoustic transducers arranged at one polar diagonal in horizontal plane, in first, second, third and fourth square vertices. Besides, it includes the chain of n acoustic reflectors arranged in series at holder on pin, perpendicular to square plate and extending through the square centre. Acoustic transducers are directed to said chain of reflectors so that all reflectors stay in the area of polar diagram of every acoustic transducers. Reflected opposite pulse acoustic signals are transmitted and received in alternating manner by pairs of acoustic transducers located in one square diagonal. Time of receipt of the trains of signals reflected from the chain of reflectors is registered to define the orthogonal components of horizontal flow velocity vector and sound velocity in aces xny in the ply between (i-1) and i reflectors by formula ; ; where τ_1(i-1), τ_1i are time arrival times of signal emitted by 1-st transducer. Signal reflected by (i-1) and i reflectors and received by 2-nd transducer; τ_2(i-1), τ_2i are time arrival times for 2-nd transducer, reflected by (i-l) and i reflectors and received by 1-st transducer. Note that τ_3(i-1), τ_3i are arrival times of signal emitted by 3-rd transducer reflected by (i-1) and i reflectors and received by 4-th transducer. Note that τ_4(i-1), τ_4i are arrival times of signal emitted by 4-th transducer reflected by (i-1) and i reflectors and received by 3-rd transducer. Note that α_i-1, α₁ are angles between horizontal and direction to (i-1) and i reflectors from every transducers; l₀ -is distance in axis x between 1-st and 2-nd transducers and in axis y between 3-rd and 4-th transducers;;EFFECT: simultaneous measurement, higher accuracy.;1 cl, 8 dwg