Water turbine wingsection for ocean current generation

Abstract

The invention relates to a kind of wing section used rof the ocean current electricity-generating water turbine. According to the fairly wide range of working condition of the ocean current electricity-generating water turbine, select the fairly small curvature and the fairly small greatest thickness. The ratio of the greatest thickness and length of chord is d/c=0.1570, the ratio of the greatest curvature and the length of chord is f/c=0.0229. The wing section has sacrificed part of functions under the routine angle, but meanwhile, it obtains the superior function of condition changing. Moving the position of the greatest thickness backward, can improve the reserve working capacity and also improve the left coefficient of wing section. At the point X r/c=0.95 of back edge, the wing section takes are as transition. The ratio of arc radius and chord length of wing section is R/c=0.0208. Enlarging the radius of back edge 1f wing section can weaken the influence when the slight wing stalls under a big angle, and reduce the damages objects uotside have done with the wing section.

Description

technical field [0001] The invention relates to an airfoil of a water turbine, in particular to an airfoil for an ocean current power generation water turbine, which is specially designed for the special requirements of the ocean current power generation on the water turbine. Background technique [0002] Ocean current power generation is a new way of obtaining energy. The water turbine used for ocean current power generation drives the water turbine to rotate through the flow of seawater, and converts the kinetic energy of seawater into the mechanical energy of the water turbine. It is an environmentally friendly and clean way to obtain electricity. Turbine blades are the most critical components of this type of turbine. As for the turbine blades, the airfoil selection and research of the blade cross section is the most direct factor affecting the mechanical efficiency of the turbine. [0003] Due to factors such as the low flow rate of the ocean current, low water head, ...

AI Technical Summary

Problems solved by technology

At this time, the lift coefficient of the airfoil will drop significantly, the drag coefficient will increase sharply, and the efficiency of the turbine will be greatly reduced, making it difficult to meet the design requirements.

At present, the airfoil used in turbine design is often limited to a small range of working conditions. In the working condition range, the airfoil has a larger lift coefficient and a smaller drag coefficient. However, once it leaves this working condition range, the airfoil stalls and performance deteriorates rapidly

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