High-specific-speed axial flow water turbine with double-inlet volute

Abstract

The invention discloses a high-specific-speed axial flow water turbine with a double-inlet volute. A seat ring is arranged in an annular opening in the inner side of the double-inlet volute, a circleof movable guide vanes are arranged in the seat ring, a rotating wheel is arranged at the bottom of the seat ring, the bottom of a drain cone penetrates through a rotating wheel, and the top of the drain cone is connected with the inner side of the seat ring in a sleeved mode; and a tail water pipe is arranged at the bottom of the rotating wheel, the rotating wheel comprises a rotating hub, a plurality of blades are uniformly arranged on the rotating hub, the tail end of the drain cone penetrates through the rotating hub, each blade is of a non-uniform-thickness twisted structure, and the front surface and the back surface of each blade are smoothly connected through curved surfaces with different curvatures from top to bottom. According to the high-specific-speed axial flow water turbine,double-direction water incoming is achieved through two water inlets, the uniformity of water flow in the volute in the circumferential direction is improved, and the velocity component of the waterflow in the circumferential direction is improved, so that the water flow circulation of the incoming flow is effectively improved, the water flow condition entering a water distributor is improved, the hydraulic loss of the water distributor is reduced, and the advantages of being high in hydraulic performance and high in operation efficiency and the like are achieved.

Description

technical field [0001] The invention relates to a high-specific-speed 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 turbine...

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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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