Numerical Study of Hydraulic Excitation Modes Caused by Rotor-stator Interaction of a Runner with Splitters
In this paper,the hydraulic excitation modes caused by rotor-stator interaction of the runner with 5 main blades and 5 split blades(the number of guide vanes is 16)are studied by numerical method.The results show that the hydraulic excitation modes of the type of runner are complicated.In the vaneless zone,the number of the diametrical"node"of the excitation mode of the frequency is the same with the multiple of the rotating frequency,e.g.,5 times the rotating frequency corresponds to 5 diametrical"node",etc.In the flow passage of the guide vanes and stay vanes,the excitation modes are characterized by both the number of main(or splitter)blades and the number of total blades,such as a one-nodal diametrical mode shape is found for the 15 times the rotating frequency,and the node number of diametrical model of the 20 times the rotating frequency is 4 with the rotational direction of the mode being the same as the direction of rotation of the runner.The study here will be beneficial to assess the structural vibration of the pump turbine whose runner is with split blades.
pump turbinerunner with split bladesrotor-stator interactionhydraulic excitation modenumerical study
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