Spiral-blade opposite-rotation type double-runner water turbine

Abstract

The invention provides a spiral-blade opposite-rotation type double-runner water turbine. The water turbine comprises a diffusion section, a square-circle transition section connected with the diffusion section, a shell connected with the square-circle transition section, and a tail water section connected with the shell, and further comprises a front-section runner and a rear-section runner whichare arranged in the shell; and each of the front-section runner and the rear-section runner comprises an inner cylinder, a spiral blade with a double-helix structure arranged on the inner cylinder and an outer cylinder arranged outside the spiral blade, the inner cylinders, the spiral blades and the outer cylinders are in an integrated structures correspondingly and rotate around a fixed shaft arranged in the shell, and the rotating directions of the front-section runner and the rear-section runner are opposite. According to the water turbine, the two-section structure design is adopted, so that a long flow channel can reduce the pressure gradient in the flow channel; the front-section runner and the rear-section runner rotate reversely, so that a rotating flow state can be eliminated; and the inner cylinders, the spiral blades and the outer cylinders integrated structures prevent cavitation between the blades and the outer cylinders correspondingly, so that the probability of mechanical damage of fishes is reduced.

Description

technical field [0001] The invention belongs to the technical field of river energy power generation, and in particular relates to a helical blade counter-rotating double-runner water turbine. Background technique [0002] In traditional hydropower stations, there are two main channels for fish to go down. One is that smaller fish enter the turbine through the trash rack in front of the dam, and the other is that fish enter the downstream through the spillway. In fact, when fish swim through the turbine or pass through the spillway, the water flow inside the turbine is complex and changeable and the mechanical structure is complex, while the water flow in the spillway is very fast, both of which will cause damage to the fish body. [0003] The ability of water turbines to reduce or eliminate damage to fish has become an important indicator of environmental friendliness, and even the key to whether the project can start. Therefore, the design of the turbine should consider i...

AI Technical Summary

Problems solved by technology

[0007] However, domestic research on fish-friendly water turbines is still in its infancy, and the ever-increasing demand for ecological civilization construction has become a new opportunity for the development of the water conservancy industry

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