device placed coaxial with the pipe, consisting of a semi-streamlined body and a disc placed downstream, causing the wake to oscillate alternately at a position between the streamlined body and the disc and a position downstream of the disc, toru teljega samatelgselt paigutatud seade, mis koosneb poolvoolukujulisest korpusest ja allavoolu paigutatud kettast, pannes voolaine vaheldumisi võnkuma voolujoonelise korpuse ja ketta vahel ning kettast allavoolu