Merjenje turbulentnega toka v kanalu s stopnico z metodo slikanja delcev

Kosanič, Nejc (author), Tiselj, Iztok (mentor)

Izvajali smo meritve hitrostnih polj v toku vode skozi kanal s stopnico. Pri temsmo uporabili metodo slikanja delcev (angleško: Particle Image Velocimetry - PIV).Meritve smo opravljali v prozorni testni sekciji z geometrijskim presekom pravoko-tnika, ki se po stopnici razširi v kvadratni presek. Testna sekcija je bila dolžine1.2 metra, omenjeni eksperiment pa smo izvajali pri toku z Reynoldsovim številomokrog 7100. Za snemanje eksperimenta smo uporabili hitro kamero, sinhroniziranoz laserjem, nato pa smo s komercialnim programom LaVision pognali obdelavo po-snetkov, kjer smo na podlagi dveh zaporednih slik pripravili hitrostne profile toka vrazličnih ravninah z dveh zornih kotov, in jih nato povprečili. Rezultati opravljeniv tem delu so uporabni za primerjavo z direktno numerično simulacijo opravljeno venaki geometriji

• Language: Slovenian
• Keywords: PIV - turbulentni tok - tok čez stopnico
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FMF - Faculty of Mathematics and Physics
• Year: 2021
• PID: 20.500.12556/RUL-124525
• COBISS.SI-ID: 52586243
• Publication date in RUL: 29.01.2021

Secondary language

• Language: English
• Title: Measurement of turbulent flow over backward facing step with Particle Image Velocimetry

Abstract

Liquid velocity fields in the flow over the backward facing step were measured withthe Particle Image Velocimetry (PIV) technique. A transparent experiment test sec-tion with the geometry of backward facing step flow and the length of 1.2 meter wasdesigned. The experimental campaign described in the present work was performedin turbulent flow with Reynolds numbers 7100. LaVision system with a single highspeed camera and a pulse laser was used for a series of two-dimensional measure-ments of the velocity field at several cross-sections from two different perspectives.The experimental setup and the results presented in this work are expected to beuseful for comparison with accurate numerical simulations.

• Keywords: particle image velocimetry - backward facing step - turbulentflow