NOVELTY - The turbine blade (2) has an airfoil surface which is provided with first openings (3) in a radially inner region of a turbine blade and with the second openings (4) in a radially outer region of the turbine blade. The first and second openings are interconnected by an air passage (5) arranged within the blade. The air is sucked in through the first openings and the air is blown out through the second openings during operations. The first openings are arranged such that the airflow over the airflow surface is enhanced with regard to the energy production.    USE - Turbine blade for wind turbine.    ADVANTAGE - Maintains trend of increasing blade lengths, guarantees stiffness of the blades in a cost and weight efficient manner, and reduces overall cost per kilowatt hour of wind energy since the first openings are arranged such that the airflow over the airflow surface is enhanced with regard to the energy production. Optimizes the blade airfoil for an optimized aerodynamic performance since the first openings are arranged such that the airflow over the airflow surface is enhanced with regard to the energy production. Improves blade section close to the root by delivery higher contribution to the energy production of the wind turbine. Increases maximum lift coefficient of the wind turbine blade by postponing or avoiding flow separation by suction unit. Reduces chord length of the blade by providing higher maximum lift coefficient. Reduces fatigue damage since the blade with a smaller chord length is less sensitive for heavy gusts during operation or even during standstill. Reduces noise emission since the boundary layer thickness can be decreased using suction. Enables the engineers to design for higher tip speeds since the maximum tip speed of the wind turbine is limited due to the limit on the noise emission of the turbine. Enables higher tip speeds and higher energy production by providing boundary layer suction. Increases overall performance of the wind turbine by increasing the lift to drag ratio.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a wind turbine blade; and    (2) a method for designing and manufacturing the wind turbine blade.    DESCRIPTION OF DRAWING(S) - The drawing shows a top view of the wind turbine blade.    Turbine blade (2)    First openings (3)    Second openings (4)    Air passage (5)