A double-side guide vane tubular water turbine with an elliptical flow channel

Abstract

The invention relates to a double-side guide vane tubular water turbine provided with an elliptical flow channel, which includes a forward water inlet channel, a vertical shaft, a support frame, forward movable guide vanes, two-way power generation runners, and reverse movable guide vanes. . Reverse water inlet channel, generator and speed increaser, characterized in that the forward water inlet channel is a forward elliptical cross-section, the ratio of its minor axis to the major axis is the golden ratio; from the forward water inlet cross-section The ratio of the short axis of the ellipse to the long axis of the water inlet section before the positive movable guide vane section increases linearly; the reverse water inlet channel is a reverse elliptical cross section, and the ratio of the short axis to the long axis is the golden section Ratio; the ratio of the minor axis to the major axis of the ellipse from the reverse water inlet section to the water inlet section in front of the reverse movable guide vane segment increases linearly. The invention can ensure smooth, unobstructed and symmetrical flow of water in the elliptical flow channel, so that the overall power generation efficiency of the unit is further improved, and is suitable for shaft tubular water turbines of various low-head tidal power stations.

Description

technical field [0001] The invention belongs to the technical field of fluid machinery and hydropower engineering equipment, in particular to a double-side guide vane tubular water turbine provided with an elliptical flow channel. Background technique [0002] 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 appl...

AI Technical Summary

Problems solved by technology

However, the channel of the device adopts a rectangular section, and the transition from the inlet section to the guide vane inlet section is a square circle, which is complicated in the three-dimensional simulation modeling and manufacturing process, and the actual application effect is not good.

At present, most of the two-way tidal power plants adopt the structure of one-sided guide vane. When the single-side movable guide vane is used, the hydraulic performance of forward power generation can be improved by adjusting the matching angle between the movable guide vane and the blade. In reverse power generation, there is no rear movable guide vane, and the water flow does not form a certain circulation before entering the runner, which cannot cooperate well with the blades, resulting in poor hydraulic performance of reverse power generation

[0004] Yang Chunxia's paper "Research on Bidirectional Power Performance of a Tidal Unit with Unilateral and Double Guide Vanes" studied the hydraulic power of the tubular tidal unit with two different forms of guide vanes, unilateral and double guide vanes. The impact of performance, when using double-sided movable guide vanes, its forward power generation efficiency is 85.81%, and its reverse power generation efficiency is 80.66%. The total efficiency of forward and reverse power generation is better than that of single-sided movable guide vanes; although The use of movable guide vanes on both sides can improve the power generation efficiency, but at the same time, there are still the following disadvantages: when the power is generated in the forward or reverse direction, the water will generate vortices after entering the water outlet channel through the outlet guide vanes, which will not only reduce the forward power generation efficiency, but also reduce the power generation efficiency. Affect the efficiency of reverse power generation

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