A hydraulic turbine includes a rotor with a runner, which is concentrically surrounded by a stator, whereby the runner comprises a plurality of runner blades arranged and distributed in a ring around a rotor axis, and each runner blade extends between a runner crown and a runner band; whereby the stator comprises a plurality of guide vanes arranged and distributed in a ring around the rotor axis, and each guide vane extends between an upper stator ring and a lower stator ring; and whereby a predetermined clearance is provided at least between the runner band and the lower stator ring. A substantial reduction of pressure pulsations in the vane-less gap between said runner blades of said runner is achieved by substantially increasing said predetermined clearance.

A hydroelectric power generation system includes: a generator driven by the hydraulic turbine; a head adjuster adjusting an effective head of the hydraulic turbine; and a controller cooperatively executing: flow rate control for controlling the generator such that a flow rate in the hydraulic turbine is brought close to a target flow rate; and head adjusting control for adjusting the effective head of the hydraulic turbine using the head adjuster such that the effective head of the hydraulic turbine falls within a first range.

A hydroelectric power generation device is structure to utilize water flowing to generate electrical power that could be supplied to a bathroom installation and is generally made up of a functional main body, a battery assembly, and a power generation module. The functional main body has two opposite sides each including a mounting end formed thereon. The functional main body forms therein a receiving chamber. The power generation module includes a stator and a rotor. The rotor is coupled, in a manner of being rotatable, to an axle, which is coupled to a vane wheel. Water flowing into the device drives the vane wheel and the rotor to rotate simultaneously so that magnetic interaction between the rotor and the stator generates electrical power that is supplied to a sensor controlling supply of water flow. A sleeve is fit over the axle for correcting and stably supporting the axle in rotation.

A runner for a Pelton turbine having a runner hub and a plurality of buckets which in each case have one bucket root. Each bucket is mounted on the runner hub with the bucket root and each bucket includes a cavity which encloses an area configured in such a manner that they passively counteract an occurring bucket oscillation. Where at least one body is movable in respect to cavity.

A wave energy absorption and conversion device and a power generation system includes a floating body, a guiding shaft, a damping plate and a counteracting mechanism placed in a movement range of the damping plate. The guiding shaft is connected to the bottom of the floating body and passes through the center of the damping plate. The damping plate may slide on the guiding shaft. A counterforce generated by the counteracting mechanism is opposite to a natural moving direction of the damping plate, so that the damping plate can be kept in a relatively static state under a synergistic effect of the counteracting mechanism, and thereby, colliding of damping plate with constraint structures above and below can be prevented when floating body is moving up and down following waves. The power generation system includes the wave energy absorption and conversion device and a power generation system.

A wave energy absorption and conversion device and a power generation system includes a floating body, a guiding shaft, a damping plate and a counteracting mechanism placed in a movement range of the damping plate. The guiding shaft is connected to the bottom of the floating body and passes through the center of the damping plate. The damping plate may slide on the guiding shaft. A counterforce generated by the counteracting mechanism is opposite to a natural moving direction of the damping plate, so that the damping plate can be kept in a relatively static state under a synergistic effect of the counteracting mechanism, and thereby, colliding of damping plate with constraint structures above and below can be prevented when floating body is moving up and down following waves. The power generation system includes the wave energy absorption and conversion device and a power generation system.

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

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

A method and device for determining a suction height of a variable speed unit is provided. The method includes: acquiring a reference cavitation coefficient and a reference specific rotation speed parameter corresponding to a target water head section in a preset number of power stations; conducting calculations on the reference cavitation coefficient and the reference specific rotation speed parameter by utilizing a target scheme to obtain a target formula; acquiring a maximum lift, a minimum lift, a speed variation range and a synchronous rotation speed value of a current target variable speed unit and input force values of the target variable speed unit at a plurality of key working condition points; and determining a target suction height of the target variable speed unit.

A method and device for determining a suction height of a variable speed unit is provided. The method includes: acquiring a reference cavitation coefficient and a reference specific rotation speed parameter corresponding to a target water head section in a preset number of power stations; conducting calculations on the reference cavitation coefficient and the reference specific rotation speed parameter by utilizing a target scheme to obtain a target formula; acquiring a maximum lift, a minimum lift, a speed variation range and a synchronous rotation speed value of a current target variable speed unit and input force values of the target variable speed unit at a plurality of key working condition points; and determining a target suction height of the target variable speed unit.