Fish benefiting type axial-flow water turbine

Abstract

The invention discloses a fish benefiting type axial-flow water turbine. The fish benefiting type axial-flow water turbine comprises a volute, a fish benefiting type water guiding system, a fish benefiting type rotating wheel system and a tail water pipe. The fish benefiting type water guiding system comprises a pressure bearing shell which is connected with an inner edge water outlet of the volute, a fin type guide plate which is embedded into the pressure bearing shell and a transmission mechanism which controls rotation of the fin type guide plate. The fish benefiting type rotating wheel system comprises spiral blades and a hub which is in seamless connection with the spiral blades. According to the fish benefiting type axial-flow water turbine, a water guiding structure which easily causes extrusion or shearing force damage to fish bodies and a rotating wheel structure which easily causes mechanical, pressure, shearing, cavitation damage and other damage to the fish bodies of a traditional axial-flow water turbine are subjected to optimal design, the ecological benefits of hydraulic engineering are improved, and coordinated development of hydroelectric energy and fish resources is achieved.

Description

technical field [0001] The invention relates to the structural design of water turbines and the cross-technical field of water ecology, in particular to a fish-breeding axial-flow water turbine. Background technique [0002] In order to alleviate the blocking effect of dams on migratory fish and protect the biodiversity of fish, large-scale water conservancy projects have adopted corresponding compensation measures in the planning, design, construction and operation process. For example, the newly built fishways of more than 10 hydropower stations including Bonneville and John Day in the Columbia River Basin in the United States have successfully solved the migration problem of salmonids passing through 20-34m higher water head hubs. my country built the first fishway in 1960, and more than 30 fishways had been built by the end of the 20th century. At the same time, imitate natural fishways, fish lifts and fish gates, etc. will be built to help migratory fish go up and cros...

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Problems solved by technology

[0003] Although the above measures have certain effects, but the construction cost is high, the efficiency is low, and there will still be a large number of fish that will be injured when passing through the water turbine, which will not achieve the expected effect, and will also cause the consumption of water flow energy

As the most economical discharge channel of the dam, the water turbine flow channel not only maintains the continuity of the upstream and downstream water bodies of the dam but also brings huge power generation benefits. However, due to the complexity of the traditional water turbine flow channel and its hydraulic characteristics, fish rely on the turbine flow When the channel goes down and passes the dam, it will suffer from multiple damages such as mechanical, pressure, shear, cavitation, etc., resulting in low efficiency of the turbine channel passing fish

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