Bidirectional through-flow turbine for generating power by tide

Abstract

The invention relates to a bidirectional through-flow turbine for generating power by tide. The bidirectional through-flow turbine comprises a forward inflow runner, a vertical shaft, a supporting frame, a bidirectional power generation rotating wheel, a reverse inflow runner, a generator and a speed increaser. The bidirectional through-flow turbine is characterized by further comprising front equal-width movable guide vanes and rear equal-width movable guide vanes, the front equal-width movable guide vanes are arranged between the forward inflow runner and the bidirectional power generation rotating wheel, the rear equal-width movable guide vanes are arranged between the bidirectional power generation rotating wheel and a reverse inflow runner, the forward inflow runner has a forward elliptical section, the ratio of the short axis to the long axis of the forward inflow runner is a golden division ratio, the reverse inflow runner has a reverse elliptical section, and the ratio of the short axis to the long axis of the reverse inflow runner is a golden division ratio. By taking double measures of the elliptical runners and the front and rear symmetric equal-width movable guide vanes, the composite effect of the operation efficiency of the turbine is greatly improved, the overall power generation efficiency of a generator set is remarkably improved, and the bidirectional through-flow turbine is applicable to replacing various through-flow turbines of low-head tidal power stations.

Description

[0001] technical field [0002] The invention belongs to the technical field of fluid machinery and hydropower engineering equipment, in particular to a bidirectional tubular water turbine utilizing tidal power generation. [0003] Background technique [0004] With the large-scale development of my country's hydropower resources, there are fewer and fewer medium and high head sites with good economic indicators, and the development of low head runoff power stations, especially the development and utilization of tidal energy, has become a research hotspot and has entered practical use. sexual stage. The known tubular turbine has become the most economical and suitable turbine type in the development of low-head hydropower resources because of its large flow rate, high speed and high efficiency, wide high-efficiency zone, compact structure and simple layout. How to use these advantages to develop a high-efficiency low-head, high-flow two-way shaft tubular unit that can be ap...

AI Technical Summary

Problems solved by technology

The device adopts the structure of the front movable guide vane. Although the matching angle between the movable guide vane and the blade can be adjusted to produce better hydraulic performance for forward power generation, when the reverse power is generated, there is no rear movable guide vane. The water flow does not form a certain circulation before entering the runner, and cannot cooperate well with the blades, resulting in poor hydraulic performance for reverse power generation

[0007]The paper published by Yang Chunxia "Bidirectional Power Performance of a Tidal Unit with Unilateral and Double Guide Vanes )", studied the influence of two different types of guide vanes, single-side and double-side movable guide vanes, on the hydraulic performance of the tubular tidal unit. When double-sided movable guide vanes are used, the forward power generation efficiency is 85.81%, and The power generation efficiency in the direction is 80.66%, and the total efficiency of forward and reverse power generation is better than that of the single-side movable guide vane; although the use of double-sided movable guide vanes can improve the power generation efficiency, there are still the following shortcomings: when the forward or reverse When generating power in the direction, the water will generate vortices after entering the outlet flow channel through the outlet guide vane, which will not only reduce the efficiency of forward power generation, but also affect the improvement of reverse power generation efficiency.

[0008]Aiming at the complex operating conditions of the two-way tidal generator set, it is required that the forward and reverse turbine working conditions must have high efficiency in order to ensure the overall efficiency of the generating set. Maximum operational efficiency, while existing hydraulic design methods are not yet capable of maximum power generation

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