Francis-type hydraulic machine

A hydraulic machine of the Francis-type, the hydraulic machine comprising:

• an impeller, which includes a plurality of impeller blades;
• a guide vane assembly, which includes at least one ring of guide vanes, a vane-free space of the hydraulic machine extending between the impeller and the guide vane assembly;
• and
• at least three resonators configured for suppressing a plurality of pressure fluctuations which may occur during an operation of the hydraulic machine, each one of the at least three resonators respectively including a chamber and a tube connector, in each case of the at least three resonators the tube connector being connected to the chamber, in each case of the at least three resonators the tube connector including an end that faces away from the chamber and that opens into the vane-free space, the at least three resonators being configured for suppressing the plurality of pressure fluctuations occurring during the operation of the hydraulic machine, the at least three resonators being arranged at a uniform distance respectively from each other in a circumferential direction around the impeller, and the at least three resonators being adjusted to a resonant frequency which is one and the same relative to one another.