Hydraulic machines. Francis turbine pressure fluctuation transposition
Hydraulic machines. Francis turbine pressure fluctuation transposition
1 Scope
IEC 62882 , which is a Technical Specification, provides pressure fluctuation transposition methods for Francis turbines and pump-turbines operating as turbines, including:
– description of pressure fluctuations, the phenomena causing them and the related problems;
– characterization of the phenomena covered by this document, including but not limited to inter-blade vortices, draft tube vortices rope and rotor-stator interaction;
– demonstration that both operating conditions and Thoma numbers (cavitation conditions) are primary parameters influencing pressure fluctuations;
– recommendation of ways to measure and analyse pressure fluctuations;
– identification of potential resonances in test rigs and prototypes;
– identification of methods, to transpose the measurement results from model to prototype or provide ways to predict pressure fluctuations in prototypes based on statistics or experience;
– recommendation of a data acquisition system, including the type and mounting position of model and prototype transducers...
Другие стандарты PD