Experimental investigation on a high head model Francis turbine during load rejection

28th IAHR symposium on Hydraulic Machinery and Systems

Goyal, R.^1,3 ; Bergan, C.^2 ; Cervantes, M.J.^2,3 ; Gandhi, B.K.^1 ; Dahlhaug, O.G.^2

Indian Institute of Technology Roorkee, Roorkee

247667, India^1

Waterpower Laboratory, Norwegian University of Science and Technology, Alfred Getz vei 4, Trondheim

7034, Norway^2

Department of Eng. Sci. and Math, Lulea University of Technology, Luleå

97187, Sweden^3

关键词: Best efficiency point;    Experimental investigations;    Instantaneous pressures;    Knowledge dissemination;    Particle image velocimetries;    Steady and transient;    Steady-state operation;    Transient operation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/49/8/082004/pdf
DOI  :  10.1088/1755-1315/49/8/082004

来源: IOP

【 摘 要 】

Francis-99 is a set of workshop aiming to determine the state of the art of high head model Francis turbine simulations (flow and structure) under steady and transient operating conditions as well as to promote their development and knowledge dissemination openly. The first workshop (Trondheim, 2014) was concerned with steady state operation. The second workshop will focus on transient operations such as load variation and start-stop. In the present work, 2-D particle image velocimetry (PIV) with synchronized pressure measurements performed in the draft tube cone of the Francis-99 test case during load rejection is presented. Pressure sensors were mounted in the vaneless space and draft tube cone to estimate the instantaneous pressure fluctuations while operating the turbine from the best efficiency point (9.8°) to part load (6.7°) with the presence of a rotating vortex rope (RVR). The time-resolved velocity and pressure data are presented in this paper showing the transition in the turbine from one state to another.