Study on phase resonance of long and short blades pumped storage unit

Based on the theory of dynamic-static interference and the phase resonance risk coefficient caused by pressure wave propagation in the volutes of the units, this paper takes ten long and short blades pumped storage units which have been put into operation or are under construction in China as the research objects and obtained that the Mach number of the units has a linear relationship with the rated water head. Then this paper takes Luoning pumped storage units as an example to carry out phase resonance theoretical analysis and calculation. It provides reference for hydraulic design and structural design of long and short blade storage units.