A helical blade counter-rotating double-runner water turbine

Abstract

A helical vane counter-rotating double-runner water turbine, including a diffuser section, a square-circle gradient section connected with the diffuser section, a casing connected with the square-circle gradient section, and a tailwater section connected with the casing, and a front section arranged in the casing The runner and the rear runner; wherein, the front runner and the rear runner respectively include an inner cylinder, a helical blade with a double helix structure arranged on the inner cylinder, and an outer cylinder provided with the outside of the helical blade, and the inner cylinder , the spiral blade, and the outer cylinder are of an integrated structure and jointly rotate around a fixed shaft arranged inside the shell, and the rotation direction of the front runner is opposite to that of the rear runner. The invention adopts a two-stage structure design, which has a longer flow channel to reduce the pressure gradient in the flow channel; the front and rear runners rotate in reverse to eliminate the rotational flow state; the inner cylinder, spiral blade, and outer cylinder are integrated structures Prevent cavitation between the blade and the outer cylinder, reducing the probability of mechanical damage to fish.

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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