Through-flow water turbine with front and rear symmetrical constant-width movable guide blades

Abstract

The invention discloses a through-flow water turbine with front and rear symmetrical constant-width movable guide blades. The water turbine comprises a forward water inflow passage, a shaft, a supporting frame, a two-way power generation rotation wheel, a reverse water inflow passage, a power generator and a speed increaser. The water turbine is characterized by further comprising a front constant-width movable guide blade and a rear constant-width movable guide blade. The front constant-width movable guide blade is arranged between the forward water inflow passage and the two-way power generation rotation wheel. The rear constant-width movable guide blade is arranged between the two-way power generation rotation wheel and the reverse water inflow passage. Longitudinal sections of the front constant-width movable guide blade and the rear constant-width movable guide blade are in two-end streamline pointed wing shapes and are arranged symmetrically on the two sides of the two-way power generation rotation wheel. By means of the water turbine, both the forward power generation efficiency and the reverse power generation efficiency of the power generator set can be improved, so that the total power generation efficiency of the power generator set is further improved, and the water turbine is applicable to various low water head tidal power stations.

Description

technical field [0001] The invention belongs to the technical field of fluid machinery and hydropower engineering equipment, and in particular relates to a tubular water turbine with front and rear symmetrical and equal-width movable guide vanes. [0002] Background technique [0003] 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 tub...

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

[0005]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.

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