A hydro turbine of a hydroelectric power plant operates with reduced cavitation. At least one motion sensor coupled to a rotor of the hydro turbine measures motion of the rotor during operation of the hydro turbine and generates measurement data. The measurement data and one or more operational parameters of the hydro turbine employed during the measuring are acquired. The operational parameter(s) is/are indicative of power supply of the hydro turbine. Based on the measurement data and the operational parameters, at least one metric indicative of an effect of the cavitation on the hydro turbine is computed. The at least one metric is compared with at least one threshold. Based on the comparison, a determination is made that the effect of the cavitation is too high. Based on the determining, information indicating unsuitability of the one or more operational parameters is output.

A hydro turbine of a hydroelectric power plant operates with reduced cavitation. At least one motion sensor coupled to a rotor of the hydro turbine measures motion of the rotor during operation of the hydro turbine and generates measurement data. The measurement data and one or more operational parameters of the hydro turbine employed during the measuring are acquired. The operational parameter(s) is/are indicative of power supply of the hydro turbine. Based on the measurement data and the operational parameters, at least one metric indicative of an effect of the cavitation on the hydro turbine is computed. The at least one metric is compared with at least one threshold. Based on the comparison, a determination is made that the effect of the cavitation is too high. Based on the determining, information indicating unsuitability of the one or more operational parameters is output.

A hydrofoil cavitating flow control structure includes a hydrofoil. A primary protuberant stripe is disposed in a middle position of a suction side of the hydrofoil, a plurality of symmetrically-distributed secondary protuberant stripes are disposed obliquely at both sides of the primary protuberant stripe, and the plurality of secondary protuberant stripes are uniformly and equidistantly distributed along the length direction of the primary protuberant stripe. By changing geometric parameters such as an included angle between the primary protuberant stripe and the second protuberant stripe, a ratio of cross section diameters and a distribution spacing of the second protuberant stripes along a chord length direction of the hydrofoil and the like, the shedding of cloud cavitation on a hydrofoil surface is effectively suppressed, and cavitation erosion and pressure pulsation generated by cavitation collapse is reduced, thus improving the operation efficiency and the service life of hydraulic machinery.

A hydrofoil cavitating flow control structure includes a hydrofoil. A primary protuberant stripe is disposed in a middle position of a suction side of the hydrofoil, a plurality of symmetrically-distributed secondary protuberant stripes are disposed obliquely at both sides of the primary protuberant stripe, and the plurality of secondary protuberant stripes are uniformly and equidistantly distributed along the length direction of the primary protuberant stripe. By changing geometric parameters such as an included angle between the primary protuberant stripe and the second protuberant stripe, a ratio of cross section diameters and a distribution spacing of the second protuberant stripes along a chord length direction of the hydrofoil and the like, the shedding of cloud cavitation on a hydrofoil surface is effectively suppressed, and cavitation erosion and pressure pulsation generated by cavitation collapse is reduced, thus improving the operation efficiency and the service life of hydraulic machinery.

A method of refurbishing a facility for converting hydraulic energy into electrical energy including the following steps: providing a first cover plate, a second cover plate, a first opening located at an inner head cover, a second opening located at a hub, a third opening located at a runner; connecting the first cover plate to the inner head cover; connecting the second cover plate to the hub, wherein the first cover plate and the second cover plate surround an axis, and a part of an outer surface of the inner head cover, a part of an outer surface of the hub, an inner surface of the first cover plate, and an inner surface of the second cover plate are confining an annular shaped space.