A reference Pelton turbine - High speed visualization in the rotating frame

28th IAHR symposium on Hydraulic Machinery and Systems

Solemslie, Bjørn W.^1 ; Dahlhaug, Ole G.^1

Waterpower Laboratory, Norwegian University of Science and Technology, Alfred Getz v. 4, Norway^1

关键词: Flow mechanisms;    Flow visualization systems;    High-speed visualization;    Optical arrangement;    Pelton turbines;    Rotating frame;    Rotational axis;    Turbine housings;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/49/2/022002/pdf
DOI  :  10.1088/1755-1315/49/2/022002

来源: IOP

【 摘 要 】

To enable a detailed study the flow mechanisms effecting the flow within the reference Pelton runner designed at the Waterpower Laboratory (NTNLT) a flow visualization system has been developed. The system enables high speed filming of the hydraulic surface of a single bucket in the rotating frame of reference. It is built with an angular borescopes adapter entering the turbine along the rotational axis and a borescope embedded within a bucket. A stationary high speed camera located outside the turbine housing has been connected to the optical arrangement by a non-contact coupling. The view point of the system includes the whole hydraulic surface of one half of a bucket. The system has been designed to minimize the amount of vibrations and to ensure that the vibrations felt by the borescope are the same as those affecting the camera. The preliminary results captured with the system are promising and enable a detailed study of the flow within the turbine.