The sector has blades (2), where each of the blades is connected to an inner shroud and to an outer shroud (4) by the blade`s connection part. Each blade has an inner radial part with a zone connected to an outer radial part by a transition zone, and an intermediate part radially arranged inside the outer shroud. Each blade has a trailing edge with a curvature radius gradually increasing in the transition zone. The radius is maximum at a connection between the transition zone and the intermediate part, and remains constant in the intermediate part and the connection part. An independent claim is also included for a compression stage comprising a rotor wheel.
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