Low-water-head large-flow axial flow water turbine with double-inlet volute

Abstract

The invention discloses a low-water-head large-flow axial flow water turbine with a double-inlet volute. According to the water turbine, a socket ring is arranged at an annular opening in the inner side of the double-inlet volute, a circle of movable guide vanes are arranged in the socket ring, a rotating wheel is arranged at the bottom of the socket ring, the bottom of a runner cone penetrates through the rotating wheel, the top of the runner cone is connected to the inner side of the seat ring in a sleeved mode, a draft tube is arranged at the bottom of the rotating wheel, two water inlet pipes are arranged in the circumferential direction of a volute structure section, a corresponding downward slope section is arranged at the tail end of each water inlet pipe, a plurality of water outlet pipes are arranged at the tail end of the draft tube, and front surfaces and back surfaces of blades are smoothly connected through curved faces with different curvatures from top to bottom correspondingly. According to the water turbine, two-way water inflow is achieved through two water inlets, uniformity of water flow in the volute in the circumferential direction is improved, the speed component of the water flow in the circumferential direction is enhanced, the water flow circulation of incoming flow is effectively increased, the condition of the water flow entering a water guide mechanism is improved, the hydraulic loss of the water guide mechanism is reduced, and the advantages of being good in hydraulic performance, high in operation efficiency and the like are achieved.

Description

technical field [0001] The invention relates to a low-head and high-flow axial-flow water turbine with a double-inlet volute, which belongs to the technical field of water turbines. Background technique [0002] In recent years, water turbines have become an indispensable part of the hydropower industry. At present, there are a large number of installed water turbines in my country, among which the mixed-flow, axial-flow and tubular water turbines are widely used. The axial flow turbine is also called the Kaplan type. The water flow changes from a radial flow to an axial flow between the guide vane and the runner, and the water flow maintains an axial flow in the runner area. The applied water head of the axial flow turbine is lower than that of the mixed flow type, but at the same diameter and head, its flow capacity is larger than that of the mixed flow type, and it is widely used in medium and low head and large flow hydropower stations. The runner of the axial flow turb...

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Problems solved by technology

However, it only changes the cross-sectional shape of the volute, and does not optimize the water inlet conditions

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