Hydraulic investigation of a Y-bifurcator

n this paper the model test of a Y-bifurcator of a power plant will be introduced. The model test consists of a 42◦ bend, a straight pipe from the bend to the Y-branch and two branching pipes with a branching angle of 40◦. The secondary flow caused by the bend will be made visible by a Particle Image Velocimetry (PIV) and quantified with the velocity correction factor α. The downscaling of the hydraulic model test is based on the Reynolds law. This causes too high discharge rates in the model test and an extrapolation with a linear polynomial, based on the least square method, is used to get the discharge rate in respect to the head loss. The head losses and the corresponding local loss coefficient ζlocal will be presented and compared by either a linear or polynomial extrapolation.